Machine Tool Tech

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Code: 1n6I4B. Tech. (Sixth Semester) Examination April- 2010Subject: Machine Tool TechnologyBRANCH: MECHANICAL ENGINEERING

Time: Three Hours o 911 99 r'J Max Marks: 80Min Marks: 28Note: 1) Attempt all questions2) Solve any Two parts of each question3) Atl parts of each question should be answered together4) Draw appropriate figure to support your answer

I **d Explain the complete geometry of a single point cutting tool.- (B) Writ short note on the following: , -r, 6:i) Chip breakers-fypes and application. \* * 'r :: -iD Rake angle- typEs'and application'lg In orthogonal turning process the feed is 0.25mm/rev. at 50 rpm the thickness of chipV rernoved is 0.5 rnmi) What is the chip thickness ralio?ii) If the work dianreter is 50mmbefore the cut is taken, what is the approximateIength of chip removed in one minute? Assume a continuous chip.(A) How the knowledge of Macl.rinability and Machinability index is the necessity of anymachining process?, W Ex plain thermal aspect of machir-ring shorving various zones and heat dissipation\'/ -.during metal cufling operation., 16 Following data relate to an orthogonal cutting process:\'/ Chip length obtairred :96 nrm'': Uncut chip length - 240 mmRake angle used :20 degDepth of cut :0.6 rnmHorizontal and vertical components of cutting force : 2400N and 244 N resp.Determine the following:i) Shear Plane angleii) Clrip thicknessiii) Friction angle ^ Ai-\iv) Resultant cutting force 5t "'(A) Classify and Justify various bed sections at lathe machine.(B) Explain following Thread manufacturing process;i) Thread Rolling-method, advantages and limitations.ii) Thread Grinding- method, advantages and limitations.(C) What are the requirements of materials f,or beds frarnes and guides?(A) i) What is the practical significance of kinematic diagram on machine tools?ii) State various drives used on machine tools./&) Describe various criterion and ranges for selecting maximum and minimum cutting_ speeds for machine tools.-+4 Describe atty four Non -destructive testing methods(A) i) Classifu the feed gear box'ii) Describe Meander's Drive for feed gear box.*{Bt-How the machine tool maintenance can be classified and which type of maintenance" is preferred for all machines tools and Why?..r(Q Show an acceptance test chart for the lathe machine'

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8,"% 16, ( sixff'' Sn 'n) 'xq rnt#i'-, Ap-l' M\ o4Subject: Machine Tool TcehnologYBRANCII: ME,CHANICAI, NNGINEEITIN(;'l'ime: Three HoursNote: 1) AttemPt all questioZi Sotve anY Two Parts of Ql and Q23)Allpartsofeac.hquestionshouldbeansweredtogetlrer+i nraw appropriate figure to support your answerSifSC Data Book is Permilted

i) Various zonesii) Heat dissiPation(C) iitt. r"tutiontftip f* HSS tool is VTr/8=Cr' and for tungstencarbide tool viiE:c, and assuming that at a speed of 25 rn/minthetoollifewas3hrs.ineachcase.Comparetheircuttirrglivesat32 mlmin"(A.) i,[ri!r-" Lrre bed showing tbrce analysis at various parts. of'thelathe bed. AttemPt anY one. Either (B) or (C).(B) Write the use oi."infor.in[ ribs or stiffeners in lathe bed.(C) What are the *qrii..*,slf materials for becls franres

a'd gr'ridcs'(A) n 4 speed (2X2) gear box is rcquired ltl bc clcsigtrccl {irrtransmitting d ftp *itt speetl ranging 300 tpnt witl't tl'=.I '?" Sc:lccton optimum tqi ai"gtt*. anel hJnci calculate gear sizcs ur


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Afta*tpt ilny nne" Either (B) or (C)Anni"yze rhe speed loss in gear-box.A *rirbioc tool while rnachining a mild steel workpiece was foundto have a life of I hr. an'J 40 min. rvhen cutting at 50 mlmin. Findthe iool lil-e ii'the tool is to operate at a *p"Jd 30% higher thanprevious onc. r\lso calculate rhe cutting speed if tool is required toh:lve. n li{t ot'2 hrs" ancl 45 min. Assume n=0.2g

(A) l)esuritrc brietly various methods tbr testing me-S#s a'o r0surlirces and theii' relationship to other excss ind surfaces wheninstiilling the machine. o.t^^.4Altantpl $t.1t p11s" Either (B) or (C)(l]) \Vritc variru.s paranlctcrs ol'ucccpturcc tcst jbr Itadial Drillingh'lrrt:hinc.(C) Iixplain r\4sancier Drive r.vith l: l,

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CSVTU eode: ndE 08614B. Teeh"(Sixth semester) Examinafion Nov-Ilee 2008Subjeck Machine Tool TeehnoloryBraneh: Lflechanical Engineering

Time: Three hours hflax h{arhs:80Mrn Pass PIarks: 28 sNote: 1" All questions are eompulsory and cerry equal nnarks,

2" Illustrate your snsweqs by neat diagrams"3. PSG eollege Desigu Eata Book is permitted.Q"1 " (a) Name drfferentypes of outting tools.(b) Deseribc the geometry of a singie point eutting tool"

Answer any qne part (e) or (d):(c) For minimum energy requirement during plastic deformation show that theshear plane angle (/ ) is given by -d=+*q70 where,d:Rakeangle p =Frietionangle. l0'42(d) During mctal cuming test uneier orthogonai eondition , follorndng da*,a wereobtained -Cutting,velocrty ^* 165 dminRake angle: 109' Shearpldoq angle * t9oThe:cutting force was found to be 1.10 KN (1100 N) and the feed force 1"0KN" (1000 N). Show that the work input is equal to the sum of work done rn 10shearing and work done against frietion.

Q"2 (a) Narne differenttypes of eutting fluids. 0ZAttempt any two of the following:(b) Discuss and eompare face wear, flank wear and Nose wear. A7(c) How will you measure experimentdly the temperature of tip of single pointeutting tool. 0T(d) The fotlowing tool tife equation has been obtained while maehrmng steel withtr{SS tool

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v"T0"13 fl"77 60.37: gAt V = 25 mpm, f = 0.25 rnm i rev. and

d = 2"5 mm, the tool life was observed to be 90 min. eaieulatc the eftbet ontool life far Z}%rnerease ln speed, feed and depth of cut taken together.

Q.3 (a) \Vhat are the advantages of Cast Iron as material for hthe beds? dZ(b) What arc different types of guide-ways used for maehine tools? 04At$cmpt any one (c) or (d) part"(c) Analyse the forces acting under the head-stock of eehtre lathe as a result ofoblique tuming proeess. 10

(d) Explarn complete progedure for the design of tsall and Roller type antifrretion'10guide-ways. \Q.4 (a) Show that it is necessary to arrange spindle speeds rn Geomen{e Progression,for minimtm speed loss. 06

' ' Att.-pt any one part (b) or (c)(b), Design a Nine (09) speed gear box having standard spegds rangmg from 140,-. - _.- ;ar,.:',RPIv1to 900 RPM. The.speed of the motor is 1440 RPI\4 " Draw the krnematrearrangement of gears ant-dficuiate numtrer of teedr on arl ffie gears" iS(c) Explain the rules, procedure and importanee of the following:

(t Ray diagram (ii) Kinematic diagram (iii) Deviation diagram. 10Q.5 (a) What is the importance of Norton Drive in Feed Gear Box? How will youdesign it? 06\Attempt any one part (b) or {e) t(b) Design a feed gear box for eutting metrie tlueads ranging ftom tr"S mm to 12"0mm pitch with lCI different vahres" Use both Nofrsn dnve and lvtreander driveand a lead=sorew of 6 mrn pitch" 1"{l

(c) Explain by means of suitable diagrams, how aeeeptanee tests are performed on' cenbe lathe. S&at tools and instruments are used? 10


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CSVTU eode:M808614}flts.Tech (Sixth Semester) Examinatiorr Apr-kIay-SBSubject; Machine Tool TeehnoloryBrnnch s Meehenical EngineeringTime; Three Hours klnx fuIarks:80ilIlninnum klarks:Z8NOTE: (r) All questions are eompulsory. (ii) Illustrate your answers by mqans ofneat diagrams" (iii) FSG college llesign Data Book is permiftbd"Q.l (a) What is the use of ehip breaker? Az(b) What are the basie requirements of cutting tool materials? 04

Attempt any one part(c) or (d)(e) According to Merchant's Theory of metal eutting show that\--' the coefficient of friction (p) between tool and chip is givenby p=*.3Y'4!'-Fn * Fr.tanawhere

Fg = Horizontal cufiing Forcei Fy : Vertical Cutting Forceei = Rake angle, 10{d) A M.S. tube of 40mm dia. Was tbmed with HSS tool having12n rake angle. with 50m1rnin cutting veloeity and

0.1mm/rev.feed.The length of chip in one completerevolution of work was found to be 52mm. If the honzontalcutting force is 1600N and vertical cutting force is 800N,Calculate(i) Shear plane angle($)(ii) Coeffrcient of frietion between tool & etup (p) 10Q.2 (a) Define Machinability. 02Attempt any two parts(b) Describe and explain the meehanism of tool wear in metalcutting" A7(q) TVhat are the sources of heat in metal autting and how it isdishibuted? A7(d) The tool life of HSS tool is expressed byVT(r/?) = Cr and that for WC iool byVT"(r/s) = Cz If at a speed of 24 m/min.the tool life for both thetools is 128 nrin, oompare their tool lives at a speed of3Om/min. 07


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uQ"5 {a)/ Describe the working and design of Meander drive used rn'J feed Gear Box. 06Attempt any one part (b) or (c)(b) Design a feed Gear box for obtaining longitudrnai feeds 09 innumber raqglng from 0"2 mm/rev. io lmm/rev" C$sume apronconsknt'aS' 1/45" Use a pinion of rmodule 2.siiim and l0number of teeth" An additional reduetion of speed ftom teadScrew to Feed shaft by 0.24 has to be provided. 10(c) Deseribe the proeedure of eondueting aeeeptanee test onRadial Eriltrng fuIachine. S/hat tools and aeeessories areused? 10

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