Scholars' Mine Scholars' Mine

Bachelors Theses Student Theses and Dissertations

1914

Comparative tests of rock drill bits for piston machines Comparative tests of rock drill bits for piston machines

Thomas C. Robson

Miguel Leon Cepeda

Follow this and additional works at: https://scholarsmine.mst.edu/bachelors_theses

Part of the Mining Engineering Commons

Department: Mining Engineering Department: Mining Engineering

Recommended Citation Recommended Citation Robson, Thomas C. and Cepeda, Miguel Leon, "Comparative tests of rock drill bits for piston machines" (1914). Bachelors Theses. 69. https://scholarsmine.mst.edu/bachelors_theses/69

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COMPARATIVE T&STS OF ROCK DRILL BITS FOR PISTON MACHINES

BY

Thos HOffiON C. & M.L.CEPEDA.

A

THESIS

submitted to the racult~ of. t~e

SCHOOL OF KINES AND METALLURGY OF :-trfIE:UN!-Vilt.~.lTY oP MISSOURI -~.- -.. -:"." .. ::""::".:~.

in partial fulfillment of the ·~or~·::~~rl!r,-::d_-·.ful" -the

Degree Of

BACHELOR OF SCIENCE IN MINE ENGINEERING (Ketal Mining Option Course)

ROlla, Mo.

Approved b.Y. ____ ~~~:~ Professor ot Kinin.

17333

Contents.

page In trod uc t.iO!l •••••••••••••••••••••••••••••••••••••• 1.

Ob4ect; types of r~ck drill bits; mode of making; tempering; constants and variables.

Same •••••••••••••••••••••••••••••••••••••••••••••• 2. Machine used; how mounted; working pressure; kind of rock used; how drill holes; water used.

Regular Cross Bits

Z Bit

S tartars ........ , ............... . . .3--4. Sec 0 rld. • • • • • • • • • • • • • • • • • • • • • • • • • . • • • • • • • • • 5 - - 7 • Th 1 rd. . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - - 9 •

S tartars ................................• 10-11. Sec 0 nd. . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . • . 12 - 1 7 • Th 1 ro. . . . . . . . . . . . . . . . . . . . . . . . . . . ........ .

Bull Bl ts Starter .....•...•.....•....................• 18.

Plates plate No. Regular Cross Bit Starter and Z B 1 t s ta r t e r. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. Regular Cross Bit second............... 2.

" • "third 3. Z Bit second............................ 4. " " • . ......................... .

Conclusion. Results; advantages and disadvantages

5.

page 24.

1

Introduction.

The object of this thesis is to find out the

ralati va cutting quali ties of different kinds of rock

drill bits. The bits tested were: the regular cross bit,

the Z bit of the Southeast Missouri type and the bull

bit of the Joplin type. All these bits were made on a

No. 5 Lsyner Sharpener and were tempered as nearly alike

as possible. All conditions were kept as nearly uniform

as ~ossible during the various tests; air pressure,

length of stroke, size of bit, etc., the only variables

entering being the difference 1n bits and personal

equation of o?srators.

2

The following data are the result of practical

experiments done with different kind of bits, using

an Ingersoll-Rand C 110. Butterfly machine working

under a pressure of 80 Ibs.

The Machine was mounted on a vertioal column

whioh was fixed in a wooden frame made for the

purpose.

The rock used for the experiments was hard

granite from S9utheas~ Missouri. Holes were drilled

sligh tly inclined dov,~nwards so as to hold the amount

of water necessary for wet drilllna. Water was put

in by hand.

MISSOURI SCliOOL O~~ MINES

MINING LABORATORY 3

TESTS OF ROOK DRILL BITS Machbre .... I.ng .... r.s9..ll.~.R.a.ng .... C ... .llQ.# lUnd ef .JHt ..... Re.g.ular .... Cr.o.s.s .... B1.t .•... Gaalie ......... 1.~3/4 .... ~ ................................................. . unlith of Steel ... Starte.r ................................. ~ Kind of Steel.. ... .1.~ ..... Oc.tagQ.n ..... J.O'.S.s..Q.p

90# Air Pre •• ure ............... , ................................................... ..

- -

CHUCK TO ROCK. TOT~~?~~lGNCE DISTANCE DRILLED TIME SPEED

IoNS. PRo MIN.

Name •

..... 'nI.~.'-.J-'p..~.~.9..~ .... 9..~ ..................... ..

..I.tt:L.~.C'.9.~4~ .. ~ ................................... .. Dat •

. M~~9..b. .... l;?I.?.Q/l~.~ ...................... .. GAUGE

START FINISH REMARKS

8.8 " 3.3 3.3 1"00· 3.3 lT75 .. ..................... ........................ ...................................... -...... --. __ ....................... - ..... __ ............ -....... -- .................................................. __ ...................................................................... .

...... 0 ..... 5 ..................... _ ............... 4 ... .9 .... __ ............... 0 .... 9. ...... ......... l.S.~ .................. 2. .... 6 .......................................................... Dul.l .................... .

..................................... ••••• 0 ............................................................................................................................................................................................................................... .

.. 14 .•. 2 ..................................................................... 3. •. 2 ..... ·l .. !·OO·~ ................... 3 .•. 2 ......... _ .... 1· ... 1·5 ....................................................... " ......... .

.. 1.1,·.,·0· .... · .... · .... · .................................................. · .... 2.·8 .. · ........... ~ ................... ...... 2 .... B ........ ....................................................................................... .

..... .8 .• 2 ......................... ~ ... < ....................................... 2 •. 3. ............... ~ .......................... 2".3 .................................................. _ ........................................... ..

...... 5 .... 9 ..................... _ .............. --. .. ................................................ ~ ...................................................................... _ ....... 1 .... 7..5 ....................................... .

..... 8 .•. 1 ...................................................................... 2 •. 6. ............... ~ ......................... .2 ... 6-.... ! ....... 1 ..... 1.5 ................................................................... .

.... ·5 .. ·5 .... · .. ·· .. · .. · .... · ................................... ·· .... · ...... a .. ·3 .. · .. · ........ " .............. · .... · .. · .. 2·.·3 .... ·· .............................. ··· .. 1·v·10· ...................................... .

· .... 3-;;·e ........ · .. · ........ · .... · .. · ...... 1·3·;;·e ...... · ......................................................................................................................... " ................ N ...... G. ............... ..

...................................... ...................... ................. .................................. ................................................................. : ............... ' ...... -....................................................... .

.. 1.Q .... 4 ........................................................................ 3 ... .1 ............... ~ ........................... 3 ... 1 ............. ~ .... 7.5 ............................................ " ..................... .

-.... 7. ;~.3 ...................................................................... 1 .•. 3 .......... --.......................... _._ .............................................................. ...... 1..f)i. ....... ............. .

...... 6. .... Q .......................................................... __ .......... 2 .... 9. ............... ~ ............................ 2 ..... S ........................................................... Dull ................... ..

..... 3 •. 2 ....................................... 7. .• 2 ..................... -- ............................................................................................................ 1 .... 7.5 .......... " ......................... ..

......................................... ............................................ .................................... .......................... ...... -.. -........................................................................................................................... .

.............................................. ................................... .. ~ ...................................... _ •.......•..... _ ...................................................................................................................................... .

...................................... ............................................. ................................. ...................... ....... _-_ .......................... -................................................................................................. .

.......................................... ...................................... ................................... .................... ........ ................................... ........................... ......................... ..................................... .

...... ........ ................. ...... ...... ....................... n ...... \ ....... _; ............................................. M ....................................................................................... " ....... " ................ ..

MISSOURI SCHOOL OF MINES

MINING LABORATORY

TESTS OF ROCK DRILL BIrrS 4

H • .,hiDe ...... ln.g.er.SQll~Band .... C .... l1.Q •

KIDd of Bit ... ReIUlar. ... Cr.08S .... Bl .. \ ...... . Gaulle .............. 1.~.3..!4 .... ~ ............................................ . LeDlith of Ste.l · .... S.~t •. r ................................. ~ JUDd of Steel. ... l~ ..... Qc.t.a'o.n .... J.e.sSQ.p. Air Pr ••• ure ....... 80 ... .lba .................................... .

CHUCK TO ROCK. TOTa~p~l':cNCE DISTANCE DRILLED TIME SPEED

I-NS. PRo MIN .

.. .... !bos ... .Bob.so.n ... .c ......................... ..

........ II .• L .•..... C .•. pada .............................. N

Date

A·ppl1 .. ·4-1-l .. ··/·····14 .... ·· .. · ...... ···· .... · .. GAUGE

START FINISH REMARKS

...... 1.5 ... O'~ ................................ 1.~.9 .......................... l .. ! .. ~ .... l .. ~.Q.Q~ ............... ;t .~ .. ~ ................. ~ .. ! .. 7..Q. .................................................................. .

...... 14..&.Q ................................... 2. •. 3 ......................... 0 .•. 4 ...... :~.~ ................. ~.~.~ .. ~ ................................................................................................. ..

· .... ·l3.rO ............................ · .. · .. 4 .... 3 ............... ........ 2 •. 0 . .. l·~.OO~ ............... .2. ... 0.0 ............................................................................................... .

··· .. ·1:1 ... ·6·· .. · .. · .... · .. · ...... · ............ -6·l!l·6 ............... · ........ 2,,·3· ......... ! ...................... 2 •. 3 .... · ...... · ....................................... -............................................. ..

......... .9 .• 3 ........................... , ....... 9 .•. 2 ........................ 2 ... .6 .......... ! ...................... 2 ... .6 .................................................................................................. ..

......... .fj, .•. '!1 ................. · .. · ...... · .. ···lB·4f·S ...... · .. · .............. 3.·0· ........... !t ..................... 3·.·00· .......................................... .1 ... ~ .......................................... .

· .. · .... ·-3· ... 1·· .... · .. ······ .................................................................................................................................................................................................................. .

...... 1.5 .. 4 .............................. 1.4 .... 8 ......................... 2.1t.6 ........... ~ ...................... 2.'-.~ ................. 1 .... 7..0. .................................... " ........................... .

...... lS •. 8 ............................... 1.7. .•. 4 ........................ 2 ... 6 ........... ~ ..................... .2 .•. 6 ................................................................................................. ..

· .... ·3:0 .. ·8·· .. · .. ··· .......... · ...... · .. ·SC)· .. ·1· ......................... S·rr·'!/. ........... ! ..................... .2 •. 1.-.............. ; .................................................................................. .

......... 7. •. 5. ............................... 23 .. 2 ......................... 3 .•. 1 ........... ~ ....................... 3. ... 1. .. ~~ ......................................... 1 .•. 6 ......................................... ..

.............. 4 ............................................................................................................... _ ....... __ ..... _ ............................................................ ~.Ql-;:.aa .................. ..

...................................... •••• ' ..................................................................................... _ ••••••••• __ .......................... _ ................................................................ 0 •••••••••••••••••••• ,

........................ _ ...................................... _ ............................................................................................... __ ............................................................................................. .

a ................................................ M •••••••••••• _ ............................................. _ ••••••••••••••••••• , ........... , ................... _ ................................ _ ....................................... , •••.•••••••••• , ••••••

.................. ......... ......... ...... ~ ...................... ':"._ ................................ " ............... ~ ................................................................................ "._ ........................... M .... ..

\

••••••••• ••• •••••• •••••• ••• •••••• ••• .......... •••••••••• ••••••••••••••••• • ..................... __ •• •••••• • •••••••••••••••••••• _ .. _ .......................... __ .. ••• • •••••• _ •• , •••••• •••••• .......... ••• •••••• •••••• • ........... t ..................... .

...................................... ....................................... .............................. .. _ ........... _ .................... -.......... -.- _ ..................................... , .................................... " .......•

...................................... .................................. " ........... _, ................. _ .. ......... ~; ... -...... ~ .. -." ................. --.... ....... __ ................... _ ............... _ ................................... .

~IISSOURI SCIIOOI~ OF MINES

MININ(i IjAll()I~A'l'ORY

rT"']1:HrJ'S ()I1" 1{()(JJ<" DI={II~L 11rl'S Mnddu(' Ingerso 11 ... Rand .G ... ll.J ..

r:.­d

Kind of Bit Hegular GrOs.s Rit· Names

L~nnth of Steel Se conct 1". Octagon J.esso;)

80 Ibs.

K TO ROCK I TOTAL DISTANCE

CHUC __ -I DRILLED

.15.G

8.4

.3·.7····

2.3 ... 6. ....

... 19. •. 7

7 r-" . \)

1447.

·lU1I4

. 23 ... 3.".

..... ·?~· .. 6· ..

DISTANCE DRILLED

... 7 .. 5.

7 '=' .. '-'

4.7

",,3..,,~ ..

... ,,,,3 .• ,3,, .... ,,

..... Tb.a.s .. Robso.n .. C .•..................

......... M .• ,L .•. G.e oed~ ........ "" ..... " ............ .

GAUGE START I F(NISH' REMARKS

I SPEED

TIME I-NS. PRo MIN.

1

_._ .1 •. 7. _11_. G. _.. .......................... . 0"'" ..3 75 '--' .

".l ... G 1")" 3. GO ". I"J . ...

" .. " ".".1 .• ·5· .. ··· .. Ri··t···· .. ·,··· .. ·" .. ·· .... ·· l' r) " .. 3· .. ~:O .~

" .... ", .... " .. " ......... , · .. ······e· .. ····K~ .. ·· .... " .. ..

" .. 1 "". ..:3. .... ;)" """1 .•.. 0,, ............ "." ... "" .. " ........................................ .

" "" ..... 3 .. 3 ... ""''''',,, "" .. '

····1·G·.,4····· . . ""28·."6"",,,, .. """,,1· .. ·9 .. ,,· .. ·· .. " .. ,,!'.. · .. ·" .. ·l",,,tJ·· .... "" ...... " .. "" .. "." ......... " ........... ".,,"" ............................. " ....... .

.... 1.4.&.5 ..... .. 30 .... G ..2 .... 1"" .. "" """.".""." ... ".".2 .• "1""" .. """,, .... "" ....... "" ....

" ..... 1.2, ... ' ... " ........... ".",,' .32· •. 3"" .. · .. "" .. "1 .•. 7 .. ",, .............. !!."" "." ... "1 .... 7." ... ,, ......................... " .................................................................... .

.. · .. ··1.0· .. ·7· .. ··· .. · .. · .. ...... " ..... ·3()·.·.3 .... · " .... "· .. ·4· .. ,0··,, ........ "" . .a.~ ... " ·"· .... ·2· .. ·0 .... ""·,, .. ·,, .... """ ..... "." .. " ........... " .................................................. .

........ ·6·.·7 ............ · ...... · .... ,,···38· ... 7 .. ·· .. ··· ·" ...... 2· .. 4 .. · .... "" .. " .. ·1·!1 .. "" .. · .... ··2· .. ·4·· .. """ .. '"" ............ " ........ " ..... · .. 1·li·46 .. ···· .................................. '''.

---~-.--... ,.~-.- ...... -............................................. -............................................................................................ , ........... -................................................................................... .

..... 22 .•. 3 ............................ 4Q .•. 9 .................. 2. .•. 2, .............. 5.7.~! ............... 2, ... ;3 .................. .... l .... 4.5 ...... ............................................................. ..

" .... .20 ... ,1 ...... .. """ .............. 4.3 .•. 6 ........ " ...... 2 .... 7, .. " ............. 1.~ .............. 2 ..... 7 ...... " ................................................................................................ ..

.. · .... 1·7· .. ·4-.. · .. · ...... ·· ................ 46,,·3· .. · .. · ...... ·····2. .... 7· .......... ···36·" .. · .. ···· .... ·4 ... 5-.. · .... ···· .... ···· ....................................................................................... .

........ 14. ... 7 ...... -.......... ' .. -.......... _- ...... ' ................ ""-" ......... , ................................ ~ ....... -...... _ ................. -.. -.......................................................................................... -..... .

.................................... ................... q.9.n.tJ ... ~.~~ ..... ~.~ ...... ~.~.t ........... g.~ .................................................................................................................. .

...................... -....................................................... -..... -.... -............................... -...................................................................................................................... -........................................ .

..... -........................................................................................................................................................................................................................................................................................ . . -'-____________ ._-..! __ ---.-! _____ -L ______ --.! _____ _

MISSOURI SCHOOL OF MINES

MINING LABORA1."ORY

rrl~:ST8 OI~-' I~OCK DRILL BITS Machine ..... I.ng.arso.ll.:'!"!Rand .. C. ... l10 .. Kind of Bit .. Re.g.ulHr ... Cro.s.s .... B1..t ....... . Names

6

GIlD~e .............................. '. .. Th.o.s .... Robs.on .... C ............................ .. Lenl1th of Steel ... S.E3.99D.<:l ......... . ... M.,- .L..~.c..~.P.e..Q~ ...................................... .. Kind of Steel .. .l~ .... Qc.tagQ.n. .. J ~.S.S.op. Date

Air Pretilmrc ... .J3.Q ... .lbs. .............................. . ----.---"-------.-~ ... ---. _._---------_._---

TOTAL DISTANCE DISTANCE SPEED ... GAUGE CHUCK TO ROCK. DRILLED DRILLED TIME I-NS. PRo MIN. ·-START·----FINISti- REMARKS - .-------. --.----- .... ---.-. ---.-~-~--- _ .. -.--- ------1--·· ..... - ... ---. ------ -------

21.7 50 .. 2 . ............ 3 .•.. J.. ......... ..... 1 ..... ~ ............ ;3..!I.;~ .... . ...... 1 .•. 45 .................................................................. ..

..... 1.7 .... 8 .......................... 54".0 ........... 3 .•. 8 ................. ~ .................. 3 ..... 8 .................................................................. 7.5 ... # .................... ..

· .. ··14·.·0········· .... ·· .. ··· .... ·58·.·3····· .. · .. · ......... 4· • .3 .. ·· .. ··· ......... ~ ....... ·· .. ··· .. ··4·.·3··· ................................................................................................. ..

......... 0' .. t .. 7 ............................. 6.2. .•.. 7 ..................... ~.!' .. ~ .................. ~ ................... ~.!' .. ~ ...................................................................................................... ..

......... 5 .•. 3 ............................. 64. •. 1 ...................... 1 ... 4 ........... 2.Q.~........ .. ........ 4 .. t .. 2 .......................................... ....... 1.,..4Q .... ...................................... .

......... 3~.g .. · ...... ··· ... ·· .... ····· .. · .... ······ ........ · .... ·· ............................................................................................................................................................................... .

· .. · .. 94· ... 1 ...... ···· .. · .. ·· ......... · .. 68· .. ·3· ......... ···· ...... ·4-.·2 .... ·· .. ·· · .... l .. l ................ ·4· ... 2· .. · .. · ........ · .... ·1·¥-40 ................................................................... .

.... 19 .... 9 ........................... 73. 2 ............... 4 .... 7 ................... ~ ................. 4., .. 7. ..................................................................................................... .

...... 1·6~·O ........ ·· .. · ................ 7-9 .•. 2.· ..... ··· .......... ~ .................. ~ ................. 5 .... Q ............................................. ~ •. 38 .......................................... .

...... 1·0.·.·0· .. · .. · .. · .. · .. · ................................................................................................................................................................................................................. .

..... .17..".9 ............................ BJ .... 8 ...................... 3 .•. 6 ................... ~ ................... 3 .... 6 ..................... 1 .•. .38 ................................................................. .

.. · .. ·1·4-·,·3 .... ··· ........... · ........ 85-. ·3 ................. · .. ·..'3 .. ·5 .. · ............... ~ ................. .3 .... 5 .. · ... ··· .. ····· ............................................................ 7. .• :~. # ............... .

· .... ·1·0.·& .... · .. · .. · .... · ............ 88·.·4 .... ·· ............... -3· ... 1 ...... ·· ........... " .................. .J.~ .. 1-...................................................................... · .. ·1·f)· # ............... .

......... 7.~.7 ............................. ~.J. .. I! .. l. ........................ ?~ .. '! ......................................... ?.~ .. 7. ................................................ ! .. ~.~.~ ......................................... ..

......... 5 .... Q ....................................................................................................................................... _ ............................................................................................... ..

.................................... ................... 9.Q.~.!-.~ ~~~ .... ~.~ ..... ~~~.t .... ~ ~.i.~ ........................................................................................................ -.... ..

_ .................................... _ ..................................................... __ ................................. 0 ......................................................... _ .......................................... e __ ........................................................ .

........................................ • _ ........................................................................................................... • ••..•••• u •..•••••••• _ ........................................................................................ , ............... .

......................................... ............................................. ................................... ...................... ........................................... ................................ ................................ ......................... , .. , ........... .

MISSOURI SCHOOL OF MINES

MINING LABORATORY

TI~sr~r8 OF ROOI~ DRILL BITS Machine .. Ing.er.s.o.ll.~Rand .... C. ... l1o. •. Kind of Dit ... Re.gu-lar. ... Cr-O.S.s .... Blt ..... . Names

7

Gaulle ..................................................................................... . Th.Qs .... Robs .. ln ........ c ............................ . Lenaltb of Steel ..... §..~~~~~ .............................. . Kind of Steell.~ ..... OO.tag.Qn .... J.e.SS.QP .. ..

Air l"ressure ............ ~.9. .. J.p..~ .. ~ ........................... ..

CHUCK TO ROCK. TOT~~p~~l~NCE DISTANCE DRILLED

...M ... L .•. .ce.p.ed.a ....................................... .. Date

TIME -----1------1------- ________________ .. ___ 0. ___ __

.... .t.~ .. !.§ ............................ ~~.~.l ................... ~ .. ~.Q ....... _ ...... .l. .. ~ ....... _ ......... ~ .•.. Q .................. l. .. L~5. ...................................................................... .

.... _15 .... 6 ............................ .8? .•. 2. ..................... 3 .•. 1 .................. ~...... .. ......... 3. ..... 1 ..................................................................................................... ..

.. · ... 1·2 •. 5 ................. ·· .... ·100.·5 ................... .3 .•. 3 .... -- ...... -..... ~ ............... -.. 3 .•. 3 ... --- ................ -............................................................................ ..

·· .... ·· .. g·'I·a· .. ·· .. ·· ........ ····· .. 104· ... ]:·· .. ·· .. ·· ...... · .... 3·.·6 .. ···· ............ ~ ........ · .. ·· .... 3·.·-6·· ........ · .. · ......................................................................................... .

.......... 5 ... B ................ ......... 105 .. .B ...................... l.a.7. ............... .3.0.~ ............... 3.._.4 ............................................. 1 .... .30. ...................... " .................... , .

...... ... .3 .• .g ............................................................................... " ............... _ ..................................................................................................................................... .

.................... ~ ................... ............................................................................................................................................................................................ _ .................................................... .

. ................... .... ....... ••••••••• •••••••••• ~ .................................................................................................................................................................................................... I •••••••••••••••••

.......................................... ................................................ . _ ....................................................................................................................................... ,_ ............................. , .......... , ...... .

. ~ .......................................... ................................................................................................................................................. _ ................................................................................................. ..

.. ............. .... ..... .. ~.. ..... .... ........... .... ........ .............. ..... ..... ...... ............ ........ .... ....... ..... . ..................... ..... ~ ...................... ........... .... ..... ..................... .... . .................. __ ................ ,~- , ................... .

........................................... ......................................... .................................... .................... ...................... -............................................. _ ........................................................................ .

........................................ ............................. .......... ...... ...................................... .... ......... .............. ............. -............................... - .................... _ ... _ .. - ............................................................... ,

.................................................................................................. - ............................................................................................................................... _ ....................... , ............. , ....................... .

............................................. ............................................ ................. ............. ........... -.-........ -.... ~ .... .. _ .... _- ........... - ............. _ ......................... _ ....................................................................... .

............................................. ................................. ............. .................................... ......................... - ..................................................................................................... _-....................... , ............... .

.............. _ ......................................................................................................................... _ ...... __ ........ _ ............................................. - ..................................................... - ..... .

..................................... ........................................ ..................................... .................. -...................... _ .................................................................................................... " ........... .

~ ...... ................................................................................ _-..................................................... _ .............. _ ................................................................. _ ............................................ .

MISSOURI SCHOOL OF MINES

MINING LABORATORY

TESTS OF ROOK DRILL BITS Machine .. In'.e.rs.o.l.l::':'Rand .... C. ... llO .•. KIDd of Bit .. Regu.l.ar .... Cross .... B1.~ •.....

8

Gaulle ........ -............................ _ ............................................... . ..ThQ.s ..... RQ.b.s.o.n .... C ........................... . Lenllth of Stee... Third .-........ . ............... _ .. _ Kind of Steel ... 1.~ ..... O.a.t&go.n .... J.e.s.80.p.

80 Ibs Air Pre •• ure ......... _ ............................... _ .......................... .

CHUCK TO ROC K TOTAL DISTANCE DISTANCE . DRILLED DRILLED

_ .. M .• L .•. C.e.p.eda .................................... . Date

-- .. - ._._-------_._--_. __ .------::----:---:=---::=:---

TIMe:: REMARKS - --.. -------.---- ---------- ---------- ---.----.. -.-- ------1------

....... 2.1 .... 1 ........................... 3 .... 0 ............ _ ... .:3..!' .. Q ............ _ .. l .. ~ .......... _ ........... ~.!' .. § .... _ .............. l .. "!.J?Q .................................................................... ..

....... 17. .•. 6 ............................ 7. ... 5 ..................... 4. •. 0 ...................... ~ .................. 4 .•.. 0._ .................................................................................................. ..

· ...... 1·3 .. ·6· .... ·· .... · .. · .. · .. · .... 10· ... g ...................... 3 •. 4, ..................... ~ .................. 3 .•. 4 .............. -... -.................................................................................. .

...... ~O .•. 2 ............... ......... ~4 .•. 4t ............. ........ 3.lt.5 .................. ~ ....................... ~., .. 5._ ............................................... l .. '! .. 4O' ...... F.#ii\1r. ................... .

.......... 6 .•. ' .......... · ................................................................................................................... _ ............... _ ....................................................................................... .

...... -26.·3· .. · .......... · .... · .. · .. 1·8;1'3· ........ · .. · ........ .3 •. g .................. ! ...................... 3 ... -9 ................ ·-1 .... 40 .... · ............................................................... ..

· .... ·2e .. ·4 .. ·· .. ·· .. ·· .. ·· ·· .... · .. 25·.-3 .. ·· ........ · ........ 7 ... ·0· .......... · ·: .. ··2·l .............. · .. 3· ... 5 .......... · .. · ...................................................................................... ..

..... 1.5. •. 4, ........................ 28 ... 1 ..... -................ 2 .•. 8 ................. ~.~ .................. 2 .... 8 ............................................. 1. •. 30 .......................................... .

.. ··· .. 1·:2·.·6-· ...................................................................................................................................... -...................................................................................... .

.. · .. 25·~·3 .... · .. · ........ · .. · .... ·3-8·; 9" ..................... 4·.·8 .. · .. · .. · .. · ................. · .. ·· ...... 4·.·8 ................ ·1 ... ·\30·· .... · .............................................................. ..

-..... 20 .•. 5 ........................ .36 ... 4 ...................... 3 .•. 5 ................... ~ ...................... 3 .... 5 ................................................................. ~ .. 1..'J ... # ..................... .

. .... 1·7-· • .0 ...................... .. 40.·1·3 .... ·· .. ........ , ... .3 .•. ~ .................. ! .......... · .......... .3· ... 9· ...... · .. ··· .................................. ~ ... 25 .. · ... 1.5· .. 1f .................... .

..... 1.~.~.1 .................................................................................................................................................................................................................................. ..

...... 2.6 .... 0 ......................... 4.4 .... 1 ........................ ~.~.S ........................ ~ ................. 9. .. , .. $ .................... 1.A.2S ..................................................................... .

...... 2.2 .• .2 .......................... 4.7. ........................... 3 .... 3 .................... ~ ........................ 3 .... 3 ........................................................................................................ .

·· .... 1-8· .. ·9··· .... · .... · .. · ........ ·50 .. ·9 ................... ·,3 .... 5 ...................... ! ...... ; ........... 3 .... Q ............................................................................................ _ .... ..

...... 1·5·.·4 ...... · ........... ····· .. f5.i·.·l .. · .... · ........ · .... .J·.·S .. ·.. ........ ... ft .............. · ........ ,J· ... S· .... · .... -.. · .......................................................................... _ ..... ..

...... 1.2.~.2 ......................... 5.7. .. 4t.Q ...................... a.!' .. ~ .................. ~ ...................... ?.! .. ~ ............................................................................ '" ........................ ..

...... 1.9 .•. 3 ......................... 58. • .9 ....................... 1 .•. ~ ................. 44.! .............. 2 .•. .6 ............................................ ~ .... 20 .......................................... . 17.4 oant.1nllad 111 naxt. nat18

MISSOURI SCHOOL OF MINES

MINING LABORATORY

TESTS OF ROCK DRILL BITS Maohine ..... In'.e.rs.oll.:-:-:Band .... C .... ll.O_. Kind of Bit.Ro,J.u.l.ar .... C.r.o..s.s .... B1.t ........ . Name •

9

Gaalle .................................................................................. . .. Thos ... Ro.bs.on .... C .•............................ Lenllth of Steel .... Th.1.rd Kind of Steel..l. ........ O.ct.aaOn .... Je.SSO.p .. Air Pre.8ure ........ S'O .... l.b.s .................................... .

DISTANCE DRILLED TIME SPEED

t-NS. PRo MIN •

_ .... M.t.L., .. C..~.P. . .,.g.~ ...................................... .

GAUGE START FINISH REMARKS

............ _-.-.-.... -... _ ......................... _- .......... __ ... -----_ ...................... -.... __ .......... _ ........ _- ......... _--_ ................... _ .................................. _ .......................... _ ................................................. .

.. 25 .• 9 ................................ 66 .•. 00 ............... 7 .... 1 .................. 2 .. ~ .................. 3 .•. 5.5 ............. ~ ... .20 ...................................................................... ..

·.1.8 .... ' .................... ···· .. ···· .. 13.·S·········· ....... 1 .... 8. ................. ~ ...................... 3 .•. St .................................................................................................... ..

·1-9·.··9··· ...... ··········· .................................................................................................................................................................................................................. .

.. 29 .•. 1 ............................... 81 .... 4. ................. 7 .•. 6 .................. ~ ....................... 3.&.8 .................... ~,..2.Q ....................... __ .... ~ ....................................... ..

.. 2·1··.·5· ...... ·· .... · .. · .. · · .. · .. " .... 89-.·0.·· .. · .... · · .. -.. 6 · .. 6· .. ·· .. · .. · .. · ..... ! ....................... 3. •. 3................ .. ..................................................................................... .

··a:4· ... 9 ...... · ...... ·· .. · ........................................................................................................................................................................................................................ .

.. 2.7. ... 0. ............................... 9.2 .... ;3 .................... ,.~ ................... ~ ...................... ~.~ .. l.~ ............. 1.!.?Q ....................................................................... .

.22 ... 1 ............................... 9B •. 6 .................. 6 .... 3 .................. ~ ..................... ~ .. t .. l.5. ................................................................................................. .

.. 1·6 .. ·4 .. · .. · ........ ·· .... ·· .. · .. ·103· .. ·6····· .. · .. · ....... 5 ... 0 .................. !! ..................... 2 .... 50 .................................................................................................. ..

··1·1· .,.4-........... ......... .. ....... ......... . .............................................................................................................................................................................................. .

.. ?§ .. '!.? ........................... J9..f:!. .. ~ .. ~ ................... ~.~.~ ................... ~ ...................... ?~ .. ? .. ?. ............. } .. ~ .. ~9. ................................................ " .................... .

. 20 ..•. 7 ............................. 11.6 .•.. 9. .................. ?.~ .. ~ .................. ~ ...................... ~ .. ~ .. ~ ............................................... ! .. ~.:~ .. ~ .......................................... .

.. 12 ... 9 ................................................................................................................................. _ ...................................................................................................... .

" 1 (')1'1 1 5 2 I'.'l' 11=: " ~ '2.1 1 15 ··S5· ... f .. ·· ........ ·· ...... · ......... 66 ... ··· ............. ....... ... . .............. Go .... · .. · ................ .c:......... .. ............. ...L.... . .................................................................... .

··eo·.·-5 .. · .. · .... · ........ · ...... · .. l:~·;;·O .. ·· .. · .. ·· · ...... 6 \".g ........................ ~ ................... ~ .•. 'O·7· ...... · .. ·· ................................. 1· •. 1.0 ..................... , .................... .

.. +..~.! .. ~ ........................................................................................................................................................................................................................... _ ..... .

.. 2.5..!I.~ ............................. ~.~? .. '! .. l ................... ~.~ .. ~ ................. ? .. ~ ..................... ~ .. ~ ... ~ ................... ~ .. ~ .. ~ ........................................................................ ..

.. 22 .... 2 ................................................................................................................................................................................................. ~.~.~ .. 9.!~ .................. ..

.. 26 .... 9 ............................. 133. •. 7 ................... ~ ... .6 ........... ~ .. ! .... 5.5~ ............ Q .•. £l .................. 1 .... 1 ......................................................................... . 25 3

MISSOURI SCHOOL OF MINES

MINING LABORATORY

TESTS OF ROOK DRILL BITS Maohine ...... I.n.g~.r.~.Qll:~.Bf,l.ng ..... C .... ll0 • Kind of Bit ....... Z .... Bi.t ................................................ . Names

10

2" Ganlle ..................................................................................... . Tho.s .... Ro.bso.n .... C ................................ .. Lenllth of Steel ..... S.tar.te.r. ............................... _

h ••• M.~.~.!!.G.t.p..Qd..i. ..................................... . Kind of Steel. .. .1.~ ..... OC.tag.O.n .... J.eS.SOp Date

Air Pressure ......... S.O' .... l.Q~ .. , ....... "'" ................... , ..

HUCK TO ROCK TOTAL DISTANCE DISTANCE C . DRILLED DRILLED TIME REMARKS ---.·--·-.1--- -.. ----- -'------._- ______ 1·------. -----1------

-••••••••.•.•. _ 0_ . _ •• _ •• _ .•• P-.- ••• • ___ ao ..... • • _0 ............ 0·· ..••• _'.0 .••••• _ •.•••• _0 ..... _0 _. _0_ •. _0 . _ .0 __ . _ .... _ .0. _. . .. __ • __ ...•. ___ •.. __ . ___ 0' . _"_' __ . . __ 0. _0_ _ .............. 0 . _ •.•• eo ........ _ ••• _0... •• ~ .................................... .

........... 15 .... & ........................................................ 1 .... 3 .............. 1. .. ' ...................... 1.a .3 ..................................................................................................... .

.......... 14· .. 0 ............ .... ·3· .. 3 .... ··· .. ·· .. ·· .. · .... · .. · .. 1·.·5 .. · .... · ......... ~ ................ ······1· .... 5· .. · .. ·· .... · .............................. 1· .. 8§. .. ···· Bent·· ...... ·· ............. ..

.... ···· .. l.a·.·o ............................................................................................................................................................................................................................ .

........................ - .................................... - ........................................................................................................................ n ................................................................................................... .

......... ~3 •. 2 ........................................................ 3 •. 5 ................... !! ...................... .3 . .,.5 ............................................ 1 .•. 7 ................................................. .

......... ~ ... !1·· .. ··· .............. }'1 ... .f) ..................... ···· .. ··4·.··1···· ...... · ........ " ............ · .. ·· ...... 4 ... · ·1 .. ···· ................... _._ .............. 1·.·65-.... ··!Bro·ke:rl .. · ............... ..

......... J?.! .. ~ .............................................................................................................................................................................................. .e.d.gal .................. ..

................................................ ................................................. ....................................... .................... ....................................... .............................. .............................. ...................................... .

......... 1.1. .... Q ........................................................ 2. •. 4 .................. ! ..................... 2 .•. 4-..................... 2 .•. 0 ..................................................................... ..

·· .. ·.· .. 14. .. ·6 ...... · .. ·· ......................................... ···2,,··7-.. ··· .... ·· ....... ~ ............. ··· .... ·-2-.. ··7· ............................................... _ ................................................... ..

· .. ···_·1·1 ... ·9 .... · .... · .. · ........................................... ·a.·g .... ·· .. ·· .. · ............................. g .... !j-................................................................................. , .................... ..

............ ~ .. ,.9. ........................................................ :~.!' .. 4 .................. ~ ...................... 3. .•.. 4 ............................................ 1 .... 8.5 .......... .Bant ................... ..

............ 5 .•. 6 ..................... 11 •. 4 ......................................................................... __ ......... _ ..................................................................................................... ..

......... 1.7 .•. '!'/. ............. · ....................................... ······2.-4-.. · .... _···· ....... 1 ..................... 2.4.4 ................. ·· .... 1 ... ··8·5 .................................................................. .

......... 15 .... 3. ............................................................. g. ~.? ................... ~ .................. _ .. ?~ .. ~ ...................................................................... ~ .~.9..~ ....................... .

........ 13 .•. 1 ...................... 46 .... QO ..................................................................................................................................................................................... ..

......................................... .............................................. ...................................... ..................... ......... _ ........................... -............. " .................................................................................. .

............ 8 •. 4 ....................................................... .2 .•. 0 .................. ~ ...................... 2 .•. 0 ..................... a.! ........................................................................ ..

.. · ........ ··6·.·-4-.. ·· .. · ................ ·3·~··9·· .. · .. · ........... · .. ·l·.,,g· ................. ~ .......... · .......... 1·.·~ .. · ...................................... -1 .•. S .. · .. · ...... ~u J:·l· .. · ...................... . 4.5

MISSOURI SCHOOL OF MINES

MINING LABORATORY

"-rJ~'~STS OI-f I~OCK Dl{II.JL 1-3JrrS 11 H aehine ..... Ins.e.r.so .. Ll.':':'.Rand .... C ... .110

Kind of Bit ........... ~ .. J~t~ ............................................ .. NameN

Gaulle .......... 2~ ................................................................ .. Thos ... Bo.bson .•. C.,. ............................. .. Lenllth of Steel .... ~.~.~~.t..~.r. ............................ _ Kind of Steel .. 1.~ .... Oc.tagon ... Jess.o.p. Air Prea.ure ....... SQ .... l.b.$ .................................... ..

..... 8 .... 6 ................................ Q .•. 9 ...................................... ..

SPEED I-NS. PRo MIN.

...... M.L .•. Ce.p.e.da. .. ···· .. ·· ... ·.· .................... M

Dote

GAUGE -'S'TART ... FINISH REMARKS

.. ... -~ .. -.- ... ----.-. _._------

.. ................ 2.~ .............. ..

..... 7. .•. 7... ...... ............ .. ......... 3 .• 5 ... · ................ .2 ... 6 .............. 1. ~ ..................... 2 .•. .6. ............................................. . 1 •. l.l ....... ..................................... ..

··· .. ·5v·l······ .... ····· .. ······ ......................................... ~.--............. --_ .......... -.. -_ .................................... _- ......... -.............. _-.-- ............................................................................. .

.. · .. 9·~·?5 .. · .. · ................ · .... ·5 .. ~ .. 5fr .. · .. ·.. ..··· .. 9·.·05 ...... · .... H ................... · ...... 2·;·eS· ........ · ........ l·~·9 ..................................................................... ..

.. 1 .... 1. .................................... 1 .•. 6.5.... ..... .. ...... 2 , .. 1 .................. ~. .......... .. ......... 2. .... 1.......... ...... .. ..................................................................................... .

...... 5 .•. 6 ............................... . .<3 ..... (i5 .... ........... ... 1 •. 0 ....... ........ 3.0.~~ ................... 2 .•. 0 ................................................ 1 .... 8 .............................................. .

· .... ·4·.,·€i .... · .......... --· ...................................................... --.... -- .................................................................................................................................................... ..

.. J·0·;.·4 .... · ........... --........ · .. 11 ... · ·0·5· ........... · .... 2.·4- .... · .. · ...... 56" .. · ............... 2·.· 6· .. · ................ 1··.·8 .... · ................................................................ .

..... ';?.! .. Q ........................... l.~ .,! .. ~.q.. ........ .. .... ?.~ .. 1-............. .~ .. ~ ..................... ?~ .. ~ .................................................................................................... ..

...... 5. .... 6 ............................. 14 ... 5,(1 ................. 1 ...... 1 ............... 3.Q.~ ................... 2 ..... 2 ............................................. 1 ..... 7. .............................................. .

...... 4 ... 5 ........................................................................................................................................................................................................................................... .

·10·.·4 .. · .......... · .............. 16.·'·S·· .. ·· .. ·· ...... ,2 .•. -2- ............ ·l .. t ..................... 2-,. .. 2-................. · .. ·1·.·1 .. · ............... _ .................................................... .

·· .. ·8· ... 2 ........ ··· .... · .... ·· ...... lfJ .. ~··5-5· .. · ............. ·a·.·a· .. · ...... · .................... · ........ ·2 ..... 8 .... · ................................................................................................. .

..... 5 •. 4 ........................... .22 .... 25-................. 2 •. 7. .......... -......... ~ ..................... 2 .... ' ...................................................................................................... ..

.. · .. 3·.·1 .... · .. · .......... · .. ··· ...... · .. ·· .............................................................................................................................................................................................................. .

- ...................................................................................................... __ ......... __ ............................................................................ _ ...... - ............................................ u ...................................................... .

................................ .............. •••• __ .................................... • .. •••••••••••••• ............ u ••• • ................................. _ ....................................................................................................................................... .

......................................... ............................................... ............................................ ........................... ............................................... ................................ ............ O' ........................................................ .

............................................ ............................................ .......... O' ................................................................................. _ ................................ a ........................ O' ................................................................. .

MISSOURI SCHOOL OF MINES

MINING LABORATORY

TESTS OF ROCK DRILL BITS Machine ... Ing.~r..$.Q.l.l:-:.R~n~ ... .Q ... JJ.9..~. 12 mlltlbf Bit Z Bi t .............................. ..

G .. atte ...... 1-3/·4 ..... ~ ........... ........................................... . ..Tho.s .... Ro.bso.n .... C ............................. .. Lenllth of Steel ....... Se.oo.n~l.. ................................ " ...... M .• L .•. c.e.peda .................................... .. Kind of Steel .. l~ ..... OG.taIOn .... J8S.S0P..

i\~Alr Pre •• ure ............... 8D ... .lbs .............................. . Date

_'·_-~~ __ --_-~-_--._=~--__ --__ ~~_--___ -_-~:=c-~=~~~~==~========~_0============================= DISTANCE DRILLED TIME

SPEED GAUGE foNS. PRo MIN. START FINISH REMARKS

.-~- .. --- ... '''-~--- •• _.-.-_ ........... -'---~"-' -.- .. -- _._. "---_._" ------.' •• - .... --- ••• _- ...... _ •• --- ... - --- '._._._ .... _ ..... _.- ••• 0 ... _ ...... • ...................................... _._ ....... __ .................................. t.... • ................ t .......... - ••••••••

.......... 25 •. 0 ............................ 0 ... 9 ......................... J .•. 9. ................................................................. 1.., .. 1.5. ...................................................................... .

· ...... · .. P,4.·.·1· ............ ··· .. ·· .... · .... 5·.·3 ...... ·· ................. 4 .... 4 ....... 1 .. ~ ................. _ ....... 4 .... 4 ................................................................................................ ..

·· ........ 19·.·1·· ...... ··· .......... ·· .... ··9·.·9 .... · .. · ............... 4·.·0·· .. · ......... ~ ...................... 4.,. . .6 .................................................................................................. .

··· ...... ·15 .. ·1··· .. ·· .. ···· · .. ·· ........ 14.·9 ...... ·· ................. 5 .. 0 .............. ~ ...................... 5.&.0 ................................................................................................... .

· .. · .. ···-:1-9·.·1 .. ··· .. ···· .. · .. · .... · .... 19· ... 1···· .. ···· .. · .. ·· .. ·· .. ··4.·,g .... · ......... !.~ ...................... 4, .... 2 ................................................................ 7..5 ... # ..................... .

····· .. ··· .. ·5·~·9· .. · .. ······ · .. · .. · .. · .. ·2l:·~·O···· .. ·· .. .. · .. · ...... ·· .. 1·.·-9·· .. · · .. · .. 30· .. · .. · .. ··· .. · .... 3·.·8·· ................... _ ................... .1 •. 55. ........................................ ..

··· .... ········4 .. ·0· .. ····· ...... ·· ............................................................. -.............. ""., .... ~."'\'.,.,~~ ............... _- ........................................................................ ---.... ~ ......................................................... . t

·· .. ···· .. a.a·, .. 7···· .. · .. ···· ........... .a.·.·4··· .... · ................ 3 ... 4-.· ........ 1-.! ...................... 3 .•. 4 .............. 1 .... 65 .............. -.................................................... ..

.......... l.9 .... 3 ........................ ..as .•. 2 ........................ 3 .•. 8 ............... ! ...... ............... 3. ... B .......... .................................... _ ................................................. .

.......... ~5 .•. 5 ........................ .32 •. 0. .......................... 3. .. 8 ............... ~ ...................... ..3 .•. 9 ................................................................. M ............................... .

···-······1·:J. .. ,··7-.. ··· .. ··· .. ······· ...... 35·.·'1·· .. ···· .. ···· .. ·· .. ··· .. 3·,,··1·· .. · ......... Jt ......... · .. · .. ··· .... 3·,·7-.. ·_· .............................. ' .............. _ ............................................... .

......... ..... g .• ·0·· .. ·· .. ·· .............. ·39·~ .. e ....................... ·t5·~ .. 5 .. · .................. · .. · .. · .. · .. · .. ·-3-.·5 .. ·· .. ·· ............................. ···· .. 1:·.·4:5· ........................................ .

.......... 4 ... 5 ............................................................................................................ __ ......... __ .............................. _ ................................................................... ..

· .... ·· .. ·81 ... .2·.· .. ····· .............. 4-3., . ..:3 ............. ··· .. · ...... ·4·.--1-· .. · .......... 1 .......... ··· .... · .. ·4·,··]:-.. ·· .... · · .. 1-.·.,5······ .............................................................. .

....... ; .. ~.~.! .. ! ............................ ~.!..~.? ............. _ .......... ~.~ .. ~ ..... _ ........ ~ ............. _ .... _ ... ~ .. ~ .. ~ ... _ .................................................................................. 1 ............ .

.......... l.6. .... a ..... _ ................... "p..Il.1. ......................... ~.~.9. ............... ~ .... _ ................ 2 ..... ~ .......................................................... ....... 1..Oi. .................... .

.......... l.a ... 1. ......................... 52. •. 7. ......................... 3.&_Q ............... ! ........................ 3 ..... 0 ....... _ ................................................... " ..... '1.511 .... ·· ...... _·_· .. ·

.......... 9 .•. ' ............................. 57. .•. 3. ........................ 4: .•. 6. .............. ~ ...................... 4. ... 6 .. -........................................ 1 .•. 3.5 ... P.t.l.1.!i>pc .............. ..

· .. ······_··1-.-1-.. · .. ··- ............................................................................................... _ ...................................... .-...................................... €).f.f. ........................ .. nnl'it.1 nu"d ... n nAy-t na •• ... . -

MISSOURI SCHOOL OF MINES

MINING LABORATORY

TF~STS OE'" ROOK DRILL BITS 13 Maehint· Ingersoll-Rand C 110. Kind of Bit Z Bl t. GaD~e 1 ~3/4 .. ~ .............................................. . Length of Sted Second .. ............. . Kind of Steel 1" Octagon Jessop

Air l»re"811re 80.~bs ...... _ .. _ ...................... .

C'K TO ROCK TOTAL DISTANCE: --DISTANCE CHU . DRILLED DRILLEO

Names

Thos ... Bo.bso.n ... C •...............................

........ ~ .. ~.~.~ .. g.~.p..~9.-.~ .................................... . Dai.,

- .......... '- .- .. -.--.-~.--- .. - --.----- .. ........ _..... •.. - ... - -- -.--------

TIME SPEED IoNS. PRo MIN.

GAUGE START FINISH REMARKS

---.-.--_ .... -- .. --._- ------.--- -----.---- ------·1----1---- ----.-.--

........... ?~.~ .. Q ......................... ~.~ .. ! .. e. ..................... ~.~ .. § ........... ! .. ~ .......................... ~.~ .. ? ............. ! .. ~ .. ~.~..... ........................ . ................................... .

........... ~.e..~J$ ......................... 6..7 ..... 9 ..................... §.~ .. ~ .... _ ......... ~ .......................... Q.~ .. ~ ................................................................................................ .

.......... 1.2 .... 7 ......................... 13 ..... 5 .................... ~ ....... ~ ............................. U~ ........................................................................................... ..

............. .6 .•. 8 ........... .. J ... ........ 7.6 ... ·1 ................... 2 • .6 ....... 30~ ........................... 5 .•. 2 ....................................... 1 .•. 35 .......................................... ..

.......... · .. 4·.·2-· ...... · ..................................................................................................................................................................................................................... ..

. ........ ·1·5·.· {) ........................ "9 .;."2 ..................... 3·, .. ]:-.... ·· .. ·1· .. · .. · .. ·· .................. ·3·;·1 .......... · .... 1 .. ~ .. 35 .. · ................................................................. .

...... · .... 11 .. ~·'9· ..................... "-e2'~' g .................... ·3·~·' ...... · .......... _ ....... · .......... -.. 3·~·' ...... · ............. - ......................................................................... ..

.............. a. .•.. 2 ......................... 9.6 ..... 9 .......................... Q ............... ~ .............................. 0 ............................................................................................... ..

............. 4 • .2 ........................................................................................................................................................................................................................ .

.......... 22 ... .6 ........................ 9.Q·.·g· ...... · ............ 3 •. ~.M ........... ! ......................... 3~ 9-........... ··1·,,·35 .. · ................................................................ ..

........... *.~ .. '! .. 7 ........................ ~ .... !I.a .......................... '!.p. .............. ~ ........................... ~.!' .. Q ......................................... _~ .................................................... .

........... l .... !t .. ? ..................... 1.0.0 ..... 1 ..................... 5. .... ~ .............. ! ........................... 5. .... 3 ............................................................................. ,,, .................... .

.... _ ........ 9 .•. 4. .................... 1.Q4 .•. 9 ..................... 4 .•. 8 ........... 52.!! ........................ 5 .•. 0 ....................................... ~ •. 30 ........................................... ..

· ............ ·4·.·6 .... · .................................................................................................................. _ ...................................... - .............................................................. .

·· .... · .. ·1·5·.·8 ........... · .... ·· .. 10·9··.··§-.. · .... ·· .......... ··4·.·6 ........ · ...... 1.1 ...... · .............. ·4· ... 6· .... · .... · .... 1:.~ .. 3-8 .................................................................... .

.......... 1.1 .•. 2 ..................... 114 .... 2 .................... 4 .... 7. .. ,i ............ ~ ............................ 4 .... 7. .................................................................................................. ..

. .... ··· .... ·-6· .. ·5 ............................................................................................. - ................................................................................................................... -.... ..

........... _ ........... _ ................................................................................................. u ............................... - ........................................... _ ................................................... il .......................................... .

.......... -................................................................................................... .. .. ............ ........ _ ................ n. _ ............................. _ ........................................................................................ -

.............. _ ..................................... , ............................................................ .. ......... .......... .......................................... ...................................................... ...................................... .

MISSOUHI SellOOL OF MINI~S

MINING LABORATO.RY

TE~ST8 01-1-' ROOK DRILL BITS Machille ... lnge.rS.Q.l.l~Band ..... G ... ~10 .• Kind of Bit ....... Z ... Bl..t .............................................. .. Nomel!l

1..4

Gaulle ...... 1~.3/4 ..... ~ .......... .. ...Tho.s .... Ro.bson . -G ............................ . Len~th of Steel .$.~QOlJ(t.

Kind of Steel .. l~ ... .Q-ctagon ... J .•. S.SO.P.

Air Pressure ..... ".S'O .... lbs ............................. ..

TIME SPEED I-NS. PRo MIN.

.. ..... M.~.L.., .. C.e.p~g.!;(..... .. ........................ .. Date

-GAUGE' -START FINISH REMARKS

---.-----.-------.-----------.---------.---------.--.---------1------

.......... 2.5 ... 5 ...................................................... 2 ... 5 .................. 1.' ...................... 2 .... 5 ............. 1 .•. 7.5 .................................................................... ..

.......... 23 •. 0 .................................................... 2 ... 1 ..................... ~ ...................... 2 .... 1 ............................................................................................... ..

......... . ZO .•. 9. ... ...................................................... 2 .•.. 0 ..................... tt ...... ................. 2 .... 0 .... ............................................................................................. ..

.......... lS •. Q ......................................................... 1 ... 8 ...................... ~ .......... · .... · ...... 1·.·-S .. · .. · .. · ........................................................................................ ..

........ .. ·1·'·lo'·1 .... · ................................................. ·· .. 3·.·5· ...... ·· .......... g .. , ....................... ]: ... · .. 7-5 .............................................................................................. .

........... 1.3 .... 6 .......................................................... 2.&.2 ...................... ~ ....................... 1 .... 1 ............................................................ BJ .. Wl.t .. .& .............. .

........... 1·1· .. ·4· ..................... 14 .... 1 ..................................................................................................................................................... be.n.t. ..... ·.·· .. ·········

........... 24A .. Q .......... .............. 4 .. 2 .................... 4 ... 2 .............. 1 . .' .......................... 4. •. 2 .......... 1· ... 75· .. · .................................................................. ..

.......... 1.:.; .•. 8 .......... · .......... · .. 8·.·6 .. · .............. · .. ·4·,.·4 .................. !! ........... ·· .. · .... · .. · .. 4·.·4· ............................................................................................... .

· .... ······1·5·v·4·· .... · .. · · ........ ·1·3· ... e .. · .......... · .. · .. ·4·.·6 .......... · .................. · .. · .... ··· ........ ·~ .. 6 ................................................................................................... .

........... 19 .•. B ......... ........... 17. .•. 6 .................... 4. .... 4 ................. ! .......................... 4 .•. 4 ............................................................................................... .

................ 6 .•. 4-........... · ..... · ... 1.0 ...... 8· .. · .... · .. .......... 2 ... .2 ............. -30·~· .. · ..................... 4. .... 4-................................ ·· .... 1·.·5 ...... · ....................................... '

................ i .. ! .. ? ................................................................................................................................................................................................................................. .

......... ... 2.6 ..... 7.5 .................... 2.3 ...... 7. ...................... 3 .... ~ ................ 1.~ .............. _ ............. 3 .•. 9 ............ .1 ..... 5.Q .................................................................... , ..

............ 22 ... B ......... ........... .27. .... 3 ................... 3..~.6 ............... ~ ......... -................... 3 •. 6. .................................................. _ ......................................... .

......... .. ·1·9·.·-2 .. · ...... ·· .. ··· .... 31· .. ··1-...... ·· .... ·· .. · .. ·3·.·~·........ .. .... J!t .......................... ·3·,,·9·-- ....................................................... " .............................. ..

............ !.~ .. ~.~ .................... ~~ .. ~ .. ? .................... ~ .. ~ .. ~ .............. ~ ............................... ~.~ .. ~ ............................................................................................... .

...... ....... ~.~ .. ~.~ ..................... ~.~ .. ~ .. ! ...................... ~ .. ~ .. ~ ................. ~ ........................... ~.~ .~ ............................................................................................. .. continued in next nliUle

MISSOURI SCHOOL OF MINES

MINING LABORATOltY

~r]j~8r~rS Oli" ROOK DRII-IL BITS Machine ...... Ing~rs.Q.ll.~Rand .... C. ... l10. Kind of Bit .. · .... Z .... B1 .. t, .... ·· ....... ·.· ...... ··· .. ·· ................. .

G .. Dge ......... l~.3./4 ..... ~ ..... . Length of Steel ... Second

Kind of Steel.l~ ..... O.c..t.agQn .J~.S.S.O.p.

Air Pressure ... S.Q ... .l.b.s ..

CHUCK TO ROCK. TOT~~PLI~ltNCE DISTANCE DRILLED TIME

SPEED t-NS. PRo MIN.

15 Names

..Xhos ... Robso.n .. C ............................... .

M····M·.·t,·wC-e·p·eda·································· ... . Date

GAUGE . START I FINISH REMARKS

7 • 5 ....... .............. 42 ..•.. Q .. ............ ~.JtS ........... l.~ .............. 3 ..•. 8. .............. . • .1 •...•... 1 .•• 4 .5 ...... :: ... :: .. ~.:~.-.... -.=. ............. 3. .•. 7. ................................................................................................. .

........ 2.5 .•. 9 .......................... 47 .•. 2 ................ 4.~.3 .............. ~ ..................... 4 .•. 3 ·······1··.·45···.·.······· .. ·.· ..... ·.·· ................. , ................... ..

········2-1··.··6············ ···············51··.··0······ ........ ,3·.··8········· .... " ........... ············3·.·8··············· ...................................................................................... ..

......... l' .. ~ .. e. ............................. P.O'.!1 .. 4 ................ ~ .. ! .. ~ .............. ~ ....................... ~ .. I!.i ....................................................................................................... .

......... 1.3. ..•.. 4 ............................ 5.9 ..•. 4 ................. 4 .•. 0 ................ ~ ....................... 4 .... Q ........................................................................................................ ..

........ 9 .•. 4 ............... ·· ············ .. ·63·,,·5······ ........... 4-•. ~ .............. ~ ............. ··.·······4·.·1··· ......... ··· ................................. 1· ... ·4········ ...................................... ..

······ .. ·· .. 5-.. ·3 .. ··········· ................................................................................................................................................................................................................ ..

67 1 ~ 6· ~ 6 1 A · ....... 96 .•. 0 ........... ·· ........... ... ..,.. . ...... .......... s.J.... . ..................................... w... ............... ...... . •. !':t. ..................................................................... .

····· .. ·-22.·4············· .... ··········.70·.··7-······· ...... ·.·.3· .. ·6········· ..... ~ ..................... .3 ... .6 ..................................................................................................... ..

·········1·8··.·8············· ···············7·1··.··2······· ···········3·.·5········· ..... " ............ ··········-3··;·5··············· ....................................................................................... .

· .. ······1·5.·3 .. ···· .. · .. ·· ····· .. ····· .. ·7·7·\1·5·· .. ··· .......... 3 ... .3 .... ··· ........ ~ ...................... .3 ..... 3 ........................................................................................................ ..

········1·9. ·0·· .. ········· ·· .. ···········80·.·-6······· ...... ····:3-.··1· .. ······· ..... w ........... ···· .. ····· •• ··1············ ...................................... _ .................................................... .

.. .......... s. ... t .. 9 ............................. 6.4.11.8 .................. ~ .. '! .. ? .......... 1 .. ~ .... 15. ~ .......... ;, .. , .. ~Q. ............... , ........................... l..~ .~j~ ........................ -................ .

............ 4 .•.. 7 ................................................................................................................................................................................................................................... ..

.. ···· .. 26,.·3 .. ·.········· ............. M .. SS· .. ·O .. ····· .......... .3 ...... 2 .......... · .. ··1··~····· ............... 3·.··2 .................. ···· .. 1.,,·36···· .............................................................. .

······· .. 23-.··1 .. ········· .. · .. · .... ·······g·a·.·o·· .. ··· ··········4-.. ·0········· ........ J, ......... ··········4·.·-0········· .. · .. · ................ : ..................................................................... .

......... ~ ~ .. ~ .. ~ ............................. ~.§..! .. ~ ................. 1 .. ~ .. ~......... . ... ~ ........................ ~ .. ! .. ~ ........................................................................................... _ ..... ..

........ 14 .... 7 ........................ 1.QO ..•.. 6 ................. 4 .. ~ .. ~ ................. ~ ................... 4.!l.2 ...................................................................................................... .

......... 10 .•. 5 ........................ 10.4 .•. 8 ................... 4 .... 2 .............. ! ...................... 4 .... 2 ..................................................................................................... . oontinn-.rl in nA'W't. ~!!.

MISSOURI SCHOOL OF MINES

MINING LABORATORY

Tl~·~STS OF" ROCK DRILL BI'~rS Machine ..... .Ing.erso.Ll.~Band .... C. .... l.lO Kind of BiL.Z .. J3.l.t ............................................. .

16

Gaulle .... .l.~.3l4 .. ~ ... Len~th of Steel . . $.~q qn.~ .

Tho.s .... Ho.h.s.on ... C ................................. ..

Kind of Steel ... 1~ .... 9.qt-.c:tg.?~.J.~.!?~.9..P • Air Pressure.. .S'O .... lb.s ................ .

CHUCK TO ROCK. TOT~~P~a:»ltNCE: DISTANCE DRILLED

" .. ~.~ .. ~.~.9.~.p~.~.~ ....................................... .. Date

TIME:

6 • 3 1 07 • 0 ........ 2 .... 2 ............. 30.'! .................. 4 .•.. 4 ........................................... ~ .•. 3 ......................................... ..

···.···.·4 .. ·1.········ ............................................................................................................................................................................................................. .

·····2·5·.··6··············· ·········:t1·1.·1· ....... ········4·,··1··········· ···1·'·········· ·· .. ········4·.··1······ ....... · .. ·1··.·3········· ............................................................. ..

.... 21 .•.. 4 .................... 11.6 .•. 2 ............... ~ ................. ~ ...................... ~ ................................................................................................ .

...... 1.6 ... .3 ............... ··········1·21 .... ·2·· ... ··· ....... 5 .... 0 ................. ~ ....................... 5 ... 0 ..................................................................................................... ..

.. ·····1··1·· .. ·-3···· .... · ...... ···· .... ·l·a-6· ... 6··· ............ ·4· .. ·3···· .. ····· ...... " .......... ····· .. ·····4· .. ·3·········· .. ··· ........................................................................................ .

.......... 7 .. , .. Q ......................... l.2.7 .. , .. 4 .................. ~ .. ~ .. ~ ............... ~.~ .................... ~ .. ~J~ ................................................ ±.~.~ ............................................ .

.......... 5 ..... 1 ......................................................................................................................................................................................................................... ..

..... 26 ... .3 ........................ 1.31 .... ·6 ...... ··· ........ 4 .•. 2 .............. l .. ! ...................... 4 •. 2 ................. 1 .•. 3 ....................................................................... .

·· .. ··a2·v··l .. ·············· ··· .... ··136· •. ·3· .. · ... ·· · ...... 4·11··7-· .. · .. · .... · ... ~ ............. · .... ·······4.,·7···· ........ ·· .................................... ~ ................................................ ..

. ·· .... }·1·.·4·· .... ····· .. ·· · .. ·· .. ··14·1·.·0· ........ · .... ···4·.··1 .. · .. · ....................... ··· .... ·· .. ·4· ... 1············ ......................................................................................... .

...... 1.2 .•. 7 ......................... 144 .•. 8 ................. 3 .•. 8 .............. ~ .......................... 3 .•. 8 ................................................................ - ................ " ................... ..

··· ....... 9· .. ·9 ...... ······ .. ·· ......... 141 .. 41 .. 9 ............... ·3· .. ·1·· .... · .. · .... "-............. ·· ...... ·· .. 3·.·1 .. ···· .. · .. · .. · ............................. ·· .. 1· ... 25 ........................................ .

~ .. ~ ...... 5 .•. -8 ... -...... -.. -.. , ...................... u .... --_ ••••.••••..•••••••••••••• - ............. -_ ............................................. _ ...................................................................................... 1.' ................ , ••••.•...••. "

...... .27. .... 0 ........................ 1.5.0 .•.. 2 ................. 2 .... 3 ................. !! ......................... 2 .... 3. ................... 1 .•. 25 .................................................................... .

·· .. ··~A·,,·7 ................ .. · .... · .. 1·53·.··3 .... ····· ... · .... .3·.··1·· ............. ! ................ · .. · ...... ··3·11'·1 .. · ........ ·· .......................................................................................... ..

·· .... g·1·.·6·· .. ·· .... · .... · .... ·· .. 1·53·,·8 .. ··· ...... · .... {)·.·6 .... · .................................................................................... : ............................................................... ..

...... ?~.~ .. l ......................... +..9.7 .. ! .. ~ ................. ~.~ .. g ............... ~~ ............................ ~.!'; .. Q ................................................................................................... ..

"'6 '. r.:: 4°" lt~ ...... 1 .. ( .............................. 1.61 ..... Q......... ........ . •. ""-...... , ........................................ ~ ... h .................................................................................................. ..

...... 1.3 ... 4 ......................... 1.6.4 .•. 9 .................. .3 .•. 4-............... ~ ........................ 3 ... 4 ...... · ...... · ...................................... -............................................. .. nort.i nued '\ h nayJ n~aA

MISSOURI SCHOOL OF MINES

MINING LABORATORY

T}j~STS O:B-' ROCK DRILL BITS 17 Machine .... lngers.Q.l.L~.Rand .... C ... llO .... Kind of Bit ............ Z ... Bl.t. .......................................... . Gaa4e ......... .l.:::.:~./1 ..... ~ ................................................... . ..Tb.Q.s ..... B.o.b..s.9. •... c ............................... . LeDllth of Steel ....... $.~~Q.llg .............................. ,

Kind of Steel .. 1.~ ..... Qc..t.~,gon .. JO.S.S.Qp ..

Air Pre88I1re ......... ~9. .. J "l:>~ ......................... .

CHUCK TO ROCK. TOT~~p~~i~NCE DISTANCE DRILLED TIME

... J4.,.L.II.G~.p.Q.g.a ..................................... _ Date

.-SPEED GAUGE

IoNS. PRo MIN. -STAR"T---FINISH- REMARKS _.-_ .... -.... -.. -.-----.-.. -~.-.~ ... -----.. ---.... -.. ------ -- - ---1------

19 ... .9 .................... J.G.7~ .. (?. . ...... ? .. '! . .7 It 2.7 1.2 •••• ~... ............. ..... ........ • ............. ,. ...... ..... ......... • ............ •• ........... ........ • ....... , I ••• , ......................... .

....... 7 .•.. 3 .................................. ..

...... 25. •. 8 ........................ 1·71 ..... 8 ................. 4 .•. 2 .............. It........... ........ 4 .•. .2 ....................... 1 .•. 2 ..................................................................... .

.. ··21·.6 .. · ...... · .. · ........ · .. 1·75.9· ........... 4· .. ··1 .. ··· ......... ~ .................... 4· .. ·1·· .......... · .. · ........................................................................................ .

...... 1.7 ..... 5 ........................ 1.7.::1 .•.. 7 ................ 3. .•. 8 ............... ~ ...................... 3. .... 8 ......................................................... _ ... _ ........................................ ..

.. ..... 1.3 .•. 7 ......................... lg3 ... ~ ................ 4 ..... 2 ............... ~ ...................... 1 .•. 2 ........................................................................................................ ..

· .... · ...... 9·v·5 .... · ........ ·· ........ ··1·8·8· ... 9· ...... · .... · .... 4·.·3 .. · ........... ~ ...................... ·4 .. ·3· .... · .. ·· .. · .................................. · .. ·l .... ·g ........................................... .

··· ........ ·5·.·9· ................ · .......... · .. · ...... ···· .... · ........ ··· ........ · ........................................................................................................................................................ ..

• • •••••• • .......... ••• ......... ........ ...... • ....... e ... •· ..... 0· ..... eo ••• _ .... , -., •• ••••••• ••••••••• •••••• •••••• • ... 0. ••••• ......... ._ •• _ .......... 0' ....... .... ....... ...... ...... • ................. 0 e_.o •• ~ ...... _ ..... e. • ......... .... • ............................... eo .. • ••••

........ .25 .... 3 ........................................................... 5 ..... 1 .............. ~ ...................... 5 .•. 1 ............... ·· .... 1· ... ·8 .. · ..................... _ ........................................... ..

....... ·.aO ... ·,a.... ......... ......... ......... . ................. · .. · .. · .. 4· ... 1 .. · .... · .. · .... 1 .. · .......... · .. · .. ···4-.... 1· .......... · .. · ....................................................................................... .

· .. ···· .. 1·6·.··1· ...... · .. · ...................................................... 3-.............. ft ................ · .... ·4 ..... 3 .. · .... · ......... -..................................................................................... .

11 .0 A .• r:.. " A ... c.. ,'" .............................................. . .. .......... .. .... ;r. .......................................................... ::w .... ~......... . ............................ :iI ...... ~ .................................................. .

............ 7. .•. a ................................................................ 1 ............... ~ ...................... ~4 .... 7~ ................................................. 1 ..... ' ..... 8.1.0. .~:"l. .................. .

........... .2 •. 5 ............................................................................ _ .................................................................................................................... bl:o.k.en ........... .

..................................... ............. -........................................................... . ...................... .............. _ ••••••• _ ........... _ ..................... u ............................................................................. .

.......................................... ........................................ ............................... ................... -......................................................................................... -........•.•.............................

......................................... ..................................... . " ................... _ ........................................ _ .................... -.... -................................................................................................ .

................ : .................................................................................................................................... __ ......... _. __ ............................................................................................ .

...................................... ........................................ _ ............................................................................................................................... _ ......... _ ........................................... .

MISSOURI SCHOOL OF MINES

MINING LABORATORY

TE~8TS OF ROCK DRILL BITS Machine ....... I.n.g.~r..$.Q.ll.~.B.a.ng .... C ... .l.l.Q Kind of Bit ........ Bul.l .... B.1 .. t ................................... . Names

18

2" Gan~e .............................................................................. . Thg.~ .... B9.P..$9..D. ... .G ................................ . Length of Steel .. Star tar. .. .. ~ .. ~.~ .~. g.~'p'~. ~.~ ....................................... .. Kind of Steel .... .l~ ..... OC.tag.On .... J.eSSO.p Date

Air Pressure ............. S.O .... l..b.~ ............................. .. = . .:-==~.:~ __ ==:-.:.-:= ... _-:-:::.'--=-==.=::.:-.~"=: "C:.C" .. ::-:-.. : ==.."C:-:::==_=. =-.-_c-. """"C. ==ccc----====-======?:.::~::==.==::;=======

DISTANCE SPEED GAUGE DRILLED TIME ..,.S. PRo MIN. START FINISH REMARKS CHUCK TO ROCK. TOT~~p~~lCNCE

...... _ ........ --- .... -...... , .......................................................................................... -................................................................................................................................................... , ..................... .

........... 23 ..... 2 ....................................................... 5 ..... 7 ....................................................................... 2~ ............................................................................. .

........... 1' .•. 5 ....................................................... 2 ... 3 .................. l··~ .. · .. · ............ .2. • .3 .................................................................................................... .

·· .. · .. ····1·5w·,a ................................................ ·· .. ·····1 ... ··9 .. · .... ···· ....... ~ ............. · .... · .... l .... ·lJ .. ··· .. · .. · ......................................................................................... ..

··· .. ··· .. 1·3.·3 .. ····· ......................................... ·· .. ·····}··,;·9 .............................. ·· .... ·· .. ·1·.·9 .. ·· .... ·· .. · .... _ .................................................................................. ..

.......... ~.1 .•. 5 ........................................................ 1 .... 8 .................... ~ ....................... 1 .•. 3 .................................................................. n .................................. .

.............. 9 .•. 7 .......................................................... 2 •. ~ .................. ~ ................ - .... 2 .. ··1·· ... -............................................... _ ........................................... ..

··· .. ·· ...... ·1·.·6 ........ · .............................................. -9 .•. -0 .............................. · .......... ·-2·.·0··· .. ·· .. ···· ................................ 1-.•. -9 .......... Il~.n:t, ................... ..

··· ........ · .. 5· ... 6· .. · ......................................................................................................................................................... _ .......................................................... .

................................................ ..................................... -.................................................................................................................................................................................................... .

........................................... ..................... .............. ....... ••••••• u ................................................. _ ........................................................................................................... , ••••••••••••• " ••••••••••••••••

.......... . ~ ....................................................................................................................................................... -......................................................................... -...•........... ,.~ .................... .

................... ................... ....................................... .................................. ...................... ................... _ ................................................................................................................. .

.................... .......... . ~ ....................................................................................................................... -............ _ ......................................... _._.- ............................................................... .

........... ............................... .................................. _ .................................................................... - .......................... - ... - .............................. _ ............................................................. q,' •••

....................................... ................................... M .............................................................. _' ............................................................................ _ ............ _ ...................... " .......... - ••••••

........................................ .......................................... .................................. ' .......................... _._ ....................... _ ........................................................................................... _ ....... .

....................................... ........................................ ..................................... ........................ .................................... __ .......... __ ................................................................. , ............ .

.......................................... ........................................ ................................. ..................... ...................................... .......................... ............................................................... .

The following curve~ have been plotted from

the preceding data and show mora clearly the relative

cutting qualities of the'different kinds of rock

drill b1ts used.

19

Conclusion.

Some of the results obtained by the experimenur.

tend to show: that the Z bit cuts faster in the long

run than the regular cross bit.

The disadvantage in using Z bits being: that

starters ch1p-ofr at the edges eas1ly. Th1s may be

obviated b,y us1ng a b1gger cross bit starter and

then follow1ng 1t up with the Z bit starter or directly

w1th Z bit second.