Drilling machine of gabriel

8/10/2019 Drilling machine of gabriel

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Drilling Machine


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Drilling

Drilling is the operation of producing circular hole in thework-piece by using a rotating cutter called DRILL.

The achine used for drilling is called drilling achine.

The drilling operation can also be accoplished in lathin which the drill is held in tailstock and the work is held

by the chuck.

The ost coon drill used is the twist drill.


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Drilling Machine

It is the siplest and accurate achine used inproduction shop.

The work piece is held stationary ie. "laped in

position and the drill rotates to ake a hole.

Types #-Types #-

a$ %ased on construction#&ortable! 'ensiti(e!Radial! up-right! )ang!Multi-spindle

b$%ased on *eed#

+and and &ower dri(en


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'ensiti(e Drilling Machine Drill holes

fro ,. to,

peratorsenses thecutting actionso sensiti(edrillingachine


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/p-Right Drilling Machine

Drill holesupto

0

Table cano(e(erticallyandradially


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Radial Drilling Machine

It the largestand ost(ersatile

used frodrillingediu tolarge andhea(y workpieces.


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Drill MaterialsThe two ost coon types are

,. +'' drill

- Low cost

1. "arbide- tipped drills

- high production and in "2" achines

ther types are'olid "arbide drill! Ti2 coated drills! carbide

coated asonry drills! parabolic drills! split point

drill


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Drilling And Drills

Types of drills

3 Twist drill# ostcoon drill

3 'tep drill#produces holesof two or oredifferentdiaeters

3 "ore drill# usedto ake an

e4isting holebigger


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Drill fi4ed to the spindle

Drilling operationsDrilling operations

Drilling Centre Hole

Drilling Deep Holes

Drilling ThinMaterial

Drilling Pilot Hole


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Tool 2oenclature


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Tool +olding de(ices The different ethods used for holding

drill in a drill spindle are

%y directly fitting in the spindle hole.

%y using drill slee(e

%y using drill socket

%y using drill chuck


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5ork +olding De(ices


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Drilling operations perations that can be perfored in a

drillin g achine are

Drilling Reaing

%oring

"ounter boring "ountersinking

Tapping


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perations in drilling achine


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perations in drilling achine


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Types of cuttersReaers #-

Multi tooth cutting tool

6ccurate way of si7ing and finishing the pre-e4isting hole.

6ccuracy of 0.00 can be achie(ed

%oring Tool#-

'ingle point cutting tool.

%oring tool is held in the boring bar which hasthe shank.

6ccuracy of 0.00 can be achie(ed.


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Types of cutters"ountersinks #-

'pecial angled cone shaped enlargeent at

the end of the hole

"utting edges at the end of conical surface.

"one angles of 809! :19! ;09! ,009! ,,09! ,109

"ounter %ore Tool#-'pecial cutters uses a pilot to guide the cutting

action .

6ccoodates the heads of bolts.


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"ounter bore and spot facing


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Types of cutters

"obined "ountersinks and central drill #-

'pecial drilling tool to start the hole accurately.

6t the end it akes countersinks in the work

piece.

)un drill #-

Machining of lengthy holes with less feed rates.To o(ercoe the heating and short life of the

noral drill tool


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Types of cutters

Tapping#-

*or cutting internal thread

Multi cutting edge tool.

Tapping is perfored

either by hand or by

achine.

Minor dia of the thread isdrilled and then tapping is

done.


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5ork +olding De(ices ,. Machine Table


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'tep %locks

"laps


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Definitions

"utting 'peed >($#-It?s the peripheral speed of the drill( @ ADA2 where

D @ dia of the drill in

2 @ 'peed of rotation in rp

*eed Rate >f$#-

It?s the o(eent of drill along the a4is >rp$

Depth of "ut >d$#-The distance fro the achined surface to the drilla4is

d @ D B 1


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Material Reo(al Rate#-It?s the (olue of aterial reo(ed by the drill perunit tie

MRR @ >D1B C$ A f A 2 DB in

Machining Tie >T$ #-

It depends upon the length >l$ of the hole to be

drilled ! to the 'peed >2$ and feed >f$ of the drill

t @ L B f 2 in


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&recautions for Drilling achine Lubrication is iportant to reo(e heat

and friction.

Machines should be cleaned after use

"hips should be reo(ed using brush.

T-slots! groo(es! spindles slee(es! belts!pulley should be cleaned.

Machines should be lightly oiled to pre(entfro rusting


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'afety &recautions

Do not support the work piece by hand 3 usework holding de(ice.

/se brush to clean the chip

2o adEustents while the achine is operating Fnsure for the cutting tools running straight

before starting the operation.

2e(er place tools on the drilling table 6(oid loose clothing and protect the eyes.

Fase the feed if drill breaks inside the work piece.

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Drilling machine of gabriel