CODE: ME 117130+t\9osq_,

B.Tech. Seventh Semester Examination, November 2011. Subject: Connputer Aieled Design and iVlanufacturing

Branch : Mechanical EngineeringTime: Three llours Max. Marks: 80

. Min, Pass. Marks; 28equal marlis. Draw neat sketehes to support yourNote: All questions are compulsory and carry

ans\lf er.

Qu.1. Solve any two parts of the following:

a. lfite a note on Implementation of a typica! CAD process on CADICAM system.-/

-KDiscuss the Importance of PLCtr{ in Introduction and Growth stage of Product Development.

c. Write the general form of the matrix for rotation about a point'P(h,k). Perform a 450 rotationof triangle A(0,0) ,B(1,1), C(5,2) about the point (-1,-1).

Qu.2. Solve any two parts of the following: (g,g)a. Explain B spline curves? How they are different from Bezier curves? Write down the

Properties of B spline functions.b. Find out the Centre of a circle that is tangent to two known lines with a given radius.c. Describe the following:

(i). Explain Offset sirrface.' (ii) Explain Tabulated cylinder.

Qu.3. Solve any two parts of the following: (g,g)a. Write APT geometry and motion statements necessa"{y to perform the drilling operations of

the Job shown in Fig.3(a) \-},-fefine NC eoordinate systems and motion control systems, describe with neat sketches,g--6escribe NC Pro cedu re.

{8,8)

(4,r2)

Qu.4.So9" any two parts of the following:v'pxqlain Group Technology, it's importance and limitations.

-/ F;xpla;:n in detail Opitz coding system.c. Explain the Benefits and Objectives of Data Base Management System.

Qu.5. Solve the follorving:

(8,8)

a. Derive the Freudenstein's Equation for Four bar mechanism.b. Draw the coupler curye for the four bar mechanipm, Fig. 5(a) on regular intervals ofhs

degrees, Given AB : 50mm, BC = 66mm, cD = 90mm, AD = 100nnmn BE = 50mm and<CBE=450'

./ OR

cl Detennine the lengths of a four bar linkage to generate the function Y = liX inv ( 2 if the length of the srnaliest link is L cm, input angle varies from 45o toangle valies from g0oto 180o.

the interrral I <L35o ar:d outpr,rt

:.*+- 2.Foo_ J

l. .a

Fr E" 3 tq)

D

FJg " 5(q)

X"*1o b"d

Time : Three HoursNote: All questions are compulsory.

Qu. 4. Explain any four of the following in detail:a. Part farnily and its contribution in manufacturing.b, Optiz system of codingc. Organization of machine cells.d. Benefits of group technologye. Different types of data files & its application

Qu. 5. Solve any one of the following:

Qu.l. Solve any two part of the following: (8,8)a" Explain the various strategies taken during maturity phase of the product life

cycle. Give at least two examples for each phase of the product life cycle.b. Derive the transformation matrix for reflection of a point P about a line L with

slope m and y intercept (0,b).c. Explain the Subdivision algorithm for hidden sruface removal,,

Qu.2. Solve any two part of the following: (8,8)a. Generate and plot the basis/blending functions for a cubic curve with three points,

Po, Po.s, Pr and P'6.5 known.b. Generate the bicubic equation for a hermite bicubic surface in matrix form.

Explain the constituent matrices also.c. Explainthe CSG tree method of solid modeling giving an example.

Qu.3. Solve the following:

CSVTU Scheme Code: M810713

Max. Marks:80Min. Pass Marks : 28

Prepare neat figures to support your answer.

(4,L2')

(16)

B.E. (Seventh Semester) Examination, Nov. - Dec.2010Subject : Computer Aided Design & Manufacturing

Branch : Me'chanical Engineering

g.

b.Explain the coordinate systems for any CNC machines.Generate the G & M code for making a stepped shaft Fig.3(b), from a 25mmdiameter shaft. Assume speed = 3000 rpm and feed = 3Omm/min.

(or)c. Write an APT program to drill holes in a plate, Fig.3(c). Spindle rotates at 500

rpm and feed rate is 0.05 mm per revolution to drill the hole.

(4141414)

a. Generate the expression for coupler point (Xeo Ye) of the four bar chain. Drarvthe coupler curve of the coupler point E of a four bar planar mechanism, Fig. 5(a)having the following data. AB = 50mmo BC = 66mm, CD = 90mmo AD =100mm, BE = 50mmo <CBE = l0o. Plot the curve by varying input angle at aregular interval of 30o.

b. Determine the link lengths of a four bar linkage to generate the functionY = log16X for three accuracy points X1 = 9.4, Xz = 5"5 and Xr- 1.6, in theinterval I <= X <:10. Assume the smallest link length as 5 cm.

-{-I

l

a0I

L

tI

IIrl'- - l' --- -r

F g.3tlic)

\ i---> -+ zk0 0)l+-

7aI

I

l

_- v

rig.5(a)

G & M Codes

Nev -Dec- 26ieasvTL)

MillingRaoid

Irn

Turning

;ilr{ri#-i" Rd;,ii;;:-:*

.-: ;",,,1i,;-; ;;;.'iC27 .Reference ooint return check

G28 i{utomati"c.rctum to. relerence"point " "

.G29 Automatic relum from referenc-e p-oint...iG29 Automatic,relum fiom reierence polnt:Ca0 Rerum ro ]nd, 31d, 4th reference point

C4l .Cutter comoensation LeftiCa2,Cq!f91'9o1.i.p-9tq9tj.qn'S.fhl"*_._,__^-...,_,."..:( i43 Tool Leneth Comoensation (Plus)1..-":: .,"r- .. ;- ?.- .,

ic4{..ilsqlLslgll.gpmpen;"sfl-o,t}-flYIJ.{'#)..-"-,c4s "llool S,f{C"9"t"ilptp-*ig.ri ;:-,,,-ii,i",,i";,;;;;;;;;i;-,;-;;"';.,,.{n ^rG46 *Iool offset decreaseli+i F;"r .iir'i'f a,l"uid ir#H;;*"*

*''--. -r' ":.G4R .Tool oflser double decreaseC49 jfool f enetlt Compensation CancelC4e .;l-ool ienedr l;;"jbinsaiion Canc'e"i-

- - ' ".- - ""

;G50 lScalins OFFr,:-".i- ",ll; i; ,..t.- ,

28)e

'f I+7 I (r(tt LgllELll L ulrlugrtJ4rrvrr \ 4rrv!r. -t --

' : (

;G50 lScalins OFF

'c5l lScalins ONc i i .- L;;i;i ;rierdir#ji"'yrF_*:,;_"j11 ";::::-::;::::,lcs-l[4_q9!r-i.a-9cgaf -dj.na.(Sqy;fe'tn-;.e-l9"9ti-o.11-..-^,,."

rcs*"".[H-o-rhpiscgS9qr.qiryJ"e'SJ-9"1snr-iG 5 5, i$t er\ p i9 cq C g_oli.i q*js'ff qt***?*"

",-.,".ic5.9 .p9.\ pi;e{ cffi l;'lie$i$ffiJ*-"" ;-;:. ": ..-^-,C5 7 iN/ork piece C oordin ate

"#: glS,nt",*,,".,."

"ClqFt-"r'.pisp+-"c.qs';ti+jq#j##$-il:::,-:;;--rG59 Work piece Coordinate System 6

)}p*Krc:;l-o."-Y"3l*c-x#.i.pff .S*"n**".-*-gv,p#".,"".

lesg:*J-"np-*i*g*Qutlh*.9**psJl"sv..s1F-.l-e..,kPdilins^S.nnns.4.-c^x;q"tg""""lroovins Canned Cvcle

iq5"i..ei#fi q1;-Heiioi##--$##r;fr :-"":-:::::;":::-.-"

s"rl!"l*,fi,.ariable lead thread cutt

ool Nose

,ele..';ns C'

r9-,4"?",fi eqpSst"Fp'ile.gury]9"*lpi"".'tp--"..".-...--,".,8$-:"."F"...-""ep*f l*lg"Qtillll"s,*c"x,ts,.-*"---.--,.."..-"G84 ffaonins Canned clcleiepi j'o";iisig*nse* svite--".:;;;- :":;:.:.::rC86 Borins Canned Cvcle

lc s ? " " ia;-it b-gl re s"i'fiso h#ic- ::;J;;;::;

G'l1 il\4etric Units

,ct-o.,q.e.teer" c3nnid. c.y.ct{,$ ..::;:;:-.:-:i;i::".-C8l iPrllliqg Canggd..C-"yp"I . .F$1 .. Prillim fsi'ned-PJr]s,"..r9-,4"?",fi eqpSst"Fp'ile.gury]9"*lpi"".'tp--"..".-...--,".FS :. " P-"*c f lpl s Bil I'l"r c"x,ls* -*"---.--,.

,G88 lBorins"Cu*dO Cn""t.;Cgg Borins Cann6O Cvfi.',:- .i,,,/i:,..,,. ..

",F.1.!.GR9 Rorinu Canned Cvcle:--i " L;.i;iin;; id "-.i.1-..

G90 AbsolutePositioninsi,,11...--.,..".."",Cal lncremental l)osilionineG92 Renosition Orisin PointlG93 fnverse time feed

".!vcle

rG93 {nverse time t'eedl k."iG94 Per minute feed(i95 Per ievolution feed'

hEe' -'h;t'';.i;"nlii"1?

?flipitii i;iil; " "" * -^*

,G89 Borine. Canned Cvcle.-G90 AbsolutePositionins

M00 Program StopM0l Optional Prograrn StopM02 Program EndM03 Spindle On ClockwiseM04 Spindle C)n CounterclockwiseM05 Spindle StopM06 'Ioo1 ChangeM07 Mist Coolant 0nMOB Coolant OnM09 Coolant OffM l0 Clamps OnMl I Clanrps OffM30 End of Program, Reset to Start

M98 Subprogram CallM99 End subprogram and retum to main Program

crementa

M00 Program StopM01 Optional Program StopM02 Program EndM03 Spindle On Clockwise

Spindle 0n CounterclockwiseSpindle Stop

Coolant I OnCoolant 2 OnCoolant Off

M30 End of Program, Reset to StartM98 Subprogram callM99 End subprogram and return to main Program

M04M05

M07M08M09

.'\\] ,1 (; t'1 6,1 ^'

A "-(-\ , r r,i (,.t 1'! 5 +a 7 W1e ll:c J T 'i,,.; ,

t -- -.r'r\Code :09713

B.E. (Seventh Semester) Examination, April - May 2010Subject : Computer Aided Design & Manufacturing

Branch : Mechanical Engineering

Time : Three HoursMax. Marks : 80Min. Marks:28

Note: All questions are compulsory. Prepare neat figures to support your answer. Use ofpart programming ISO codes (G & M) is allowed.

Qu.l. Solve any two parts of the following : (8,8)v(a; Explain the benefits of CAD & CAM in modern day's industries.,,

(b) Explain the back face removal algorithm with example.(c) Derive the transformation matrix for the following composite transformation of a

point P in the following sequence:(i) Rotation of 459 about z axis. )<;o Y= o

Aii) Translation along x axis by 5units.Xt{t" the above tansformation matrix for transforming a triangle ABC, A(2,2), IB(6,2),C(4,6)andplottheresu1t."@''o-)rJ.r,,,-'^,F+u-4

ftu.z.solve any two parts of the following, ---- ' -q'ul^ Kn€,d)

(a) Generate the expression for a Bezier surface that covers the region R shown inFig. 2(a). Generate and plot minimum twenty points on the surface by varying u

- and v.

ffi"nerate a cubic Bezier curve for the four data points given, Po(2r2), P1(2,3),

W/pr(3,3) and P3(3,2). Plot ten points of the Bezier curve by varying the parameterru.

(c) Explain and draw the Basic 3d primitives used for solid modeling.

Qu.3. Explain any two of the following part programming given below based on ISOcoding.

i. Milling%:10O2N5 G90 G20N10 M06 T3N15 M03 51250N2O GOO XT-YFN25 20.1N30 G01Z-0.125FsN35 X3 Y2 F1O

N40 G00 z1N45 XO YON50 M05N55 M30

ii Turning o,IO

21021N5 G90 G21

N15 T0303N17 M03

(8,8)

iii Milling

Qu.4. Explain any four of the following in brief: (16)

(a) Limitations of Group Technology(b) Part Ciassification in Group Technology(c) Machine cell design for group technology(d) Data structures(e) Relational Database management system.

N20 G00 22M08N25 X4sN30 G01 Z-50F1N35 X40N4O Z2N45 X35N50 Z-25N55 X30N60 Z-10N65 G00 X100 M09N70 2100N80 M02

o/fo

:1025N5 G92XO YO ZO

Nl0 G90Nl5 G00 X25.0 Y25.0 22.0 T01 53000 M03N20 G}l z-12.0F124N25 Y75.0N30 X65.0N35 G02Y25.A I0 J-35.0N40 X25.0N45 22.0N50 G00 2s0.0 M05N55 XO YO

N60 M30

1c!2y, (16,16)Qu.5. Solve any 6ne part of the following:

(a) Explain any four of the following:* (i) Type synthesis

.-(ii) Number Synthesis(iii) Function generator /(iv) Loop closure equation

1v; Coupter curves;.--*) Y ri(or)

.<#fl1-Ver^y+t".fo"l ql

@il(b) Generate the expression for coupler point (Xe, Ye) of the fow bar chain. Draw the

coupler curve of the coupler point E of a four bar planar mechanism, Fig. .5(b) having the

following data. AB = 50mm, BC = 66mm, CD = 90mm, AD = 100mm, BE = 30mm,<CBE :0o. Plot the curve by varying input angle at a regular interval of 30o

2

FsI (0,4)

P*o {e,o>

A?P--YI frf ^ t'oLoesvTt)

{4,A)

>xt*+ Arlg. { tej,

r {x,. Y.}

Fig.s(b)

PlO {4,0)

.1'l:i={-lode: M{tt}8713

*5 z/

,f/ B. Tecte"(seventh semester) Examination April - htay, 2009C$--/ , Subject: Computer,,\ided Design ancl Mfg.t.i{.-Q',/ Branch: Mechanical Engineering//

, I'ime: Three hours Max Ntarks: g0

Min pass Marks: 2g

Notc: AII thc questions :-

Q.l t*f Explain Product cycle

, {tsvT'Ir-:',/+i./

Q.2 d,6 (4)(8)

(4)

93

Q.,4

Q.s

(DY Writc noles on :-' (.i) Essential requirements of CAll

(c)

'-(a)(t)kJ-a{bf?"t(a)

(ii) Benefits of CADwrite down the functions of Geometric Modelling and explain in short.Briefly explain "Rapid prototypi'g" and the pro""r, ,,stereolithography,'

usedin rapid prototyping with suitable diagram.Write notes on :-(i) Ilezier Cun,e(ii) I)-splinesExplain basic component of an Numericar control system. (g)Explain "Adaptive Control machinring s1,stem,'. (4)write dorvn the cNC prograrnming for the given component in given fig.-0r :_ (1)Explain the term "Part Families,,and its method.Ilxplain "Three parts classification and loading system,, [1lBriefly explain "Cornputer Aided process planning (CApp),, (4)Write the importance of f,tnite element method anilysis over analytical method (B)and by taking suitable assumptions ancl rotations cleicribe :-(i) Domain and field variable(ii) Local and globle co-ordinates(iii) Stiffness Matrix(iv) Displacement and loacl vector

(8)(8)

P.T.O.

(b) Find the definition arfbllows tbr rhe given

3, 4, w,ith finite method analvsis. I'hc data are-asPt. 1, 2,column :

IfuIodulus of Elasticity, E : 1000 Kg/cm2ElementLength, l:lOcmGoss-Section area, A : 1.0 cm2Surface tension, Ty : 1.0 Kg/cmBody weight, Y:0.5 Kg/cm3Boundary conditions, Va: 0,0

(4)

P.T.O. ?n;i.

APR--rl4r 2-a-e:)Csvrv

12,4 , g 53

r P T.0)I'-jj:

3dg3?< 6se.L

Code: ME 09713B.E. (Seventh Semester) Examination, Nov.-Dec" 2009

Subject : Computer Aided Design & ManufacturingBranch : Mechanical Engineering

Max. Marks:80Time: Three Hours Min. Pass Marks : 28

Note: All questions are compulsory. Prepare neat figures to support your ans*'er.Use of part programming codes (G & M) are allowed.

Qu.l. Solve the following: (8'8)

a. Explain the various phases of a product's life cycle with an example. Detail the

various strategies taken at growth stage'(or)

b. Explain the effects of CAD & CAM in automation using block diagram.

c. Derive the transformation matrix for rotation about a point P(h'k) by an angle 0.

Use the transformation matrix so obtained to perform a rotation of 45o of atriangle A(0,0), B(1,1), C(5'2) about a point P(-1,-1). Plot the result.

Qu.2. Solve the following: (8,8)

a. Find the equation of a ruled surface that covers the region R in terms ofparameters u and v. Also find the tangent and twist vectors of the surface. The

region R is enclosed between the lines, X = 0, Y = 0, X = 4 & Y = 2. Plot the

surface by showing minimum twenty points by varying u and v.(or)

b. Explain the blending functions of a Bezier curve. Explain the characteristics of aBezier curve based on the blending functions. Plot the blending functions for a

cubic Bezier"c. Explain the CSG tree modeling method for solid modeling. Develop the CSG

tree for the solid shown in figure, Fig.2 using a box and cylinder primitive.

Qu.3. Solve the following:a. Explain the following terms in brief

(8,8)

(i) NC Tape(ii) Disadvantages ofNC machines(iii)Absolute and incremental ooordinate positioning(iv)Components of a CNC machine

b. (i) Explain the difference between Rapid Traverse and Linear Traverse" (2)

(ii) The logo shown in figure, Fig.3(b) along with the tool path is required to be

engraved in a rectangular plate using milling operation. The plate thickness is

0.50 inch. Write a CNC program using G & M codes to mill the logo. Use

feed rate of 10 in/min.(or)

(ii) Write a CNC program for CNC Turning using G & M codes to machine a 50

mm long rod of 20 mm diameter to a step of 15 mm diameter for a length of25 mm. The spindle rotates at a speed of 12.00 rpm" -

w

Qu. 4. Solve the following: (16)

a. (i) Derive the expiession for degrees of freedom, f,] = 3(n -1) - 2j for planar

kinematic chains, where n and j represents number of links and joints respectively

with examples. (4)

(ii) Derive the Freudenstein's equation, K1 cos 0l - l(z cos 02 * Kr = Cos (02-01)

for the dimensional synthesis of a four bar function generator shown in figure,

Fig.4(b), where K1 = 11/12, K2= lllla,Ks = (lr2 +b2 -b' +lo')l2l2l4 and 0z and

0l are input and output angles respectively. (12)

(or)(b) Generate the expression for coupler point (Xe, Ye) of the four bar chain. Draw the

coupler cgrye of tn. coupler p-oirrt f of a four bar planar mechanism, Fig. 4(c)

having the following data. -AB = 50mm, BC = 66mm, CD = 90mm,

AD = l00mm, BE = i0-*, <CBE = L5o. Plot the curve by varying input angle

at a regular interval of 30o'

Qu.5. Solve any two parts the following:

c. Explain the Data Base management system in brief'

(8'8)

a.

b.

Explain in detail the OPTIZ classification system'

Exptain the Direct Clustering algorithm for cell formation. Given the machine

part incidence matrix, Matriil, formulate machine cells using direct clustering

approach.

Part number

i 2 3 4 5 6 7Ilf 1 I I Izlr t I

3i 1 I lMactrine

ilt ' r r rl numt'er

6l t .l7l 1 I I U

v*/i\,6v-Dcc 2e9

c sV r()

,{

Fig.3(c)

(2.t7S. -t.t)

iN"u*{ o.r ;-* *lo.r FFig.3(b)

E(Xe,Yc)

Fig.4(c)Fig.aft)

r^ciiidnind in RaDid

i0l .inear lnterpolation i01 lnterpolation

;ircular lnterpolation (CW):ircular lnterpolation (CCW)

303 ;ircular lnterpolation (CCW) !03

i04 lwell i04 )well

i17 (Y Plane |17 (Y Plane

i{8 i{8 lZ Plane

(zPlane ;19 'Z Planeil9320 nch Units ;20 nch Units

i21 l6tri. I lnils i21 Units

i27 leference Doint return check i27 leference point return check

rutomatic retum to reference point

rutomatlc return from reference polnt

i28 \utomatic Zero Return

i29 tuam Tano lleiurn Position;29

i30 ieturn to 2nd, 3rd, 4th reference point i30 Ind reference polnl rerurn

:ufter comDensation Left ;31 ;kio function

A2 )utter comPensation Right ;32 fhread cutting

343 lool Length comPensation (Plus] i34 lead thread

i44 ool Le"Sth CotPensation (Minus) ;c)ool Nose Radius GomPensation Left

;45 ool offset increasei42 'ool Nose Radius Compensation Right

i46 'ool offset decrease

i47 'ool offset double increase ;50 ;oorolnate sYSIem se(lrrg drru rrro^rrrrurrr I Prtr

.ocal coordinate system settingi,l8 '^^l

^fi.cl .loubla decrease i52

;ol Lenqih Compensatlon cancel ;53 lachlne coordinate system setting

Vork Diece Coordinate System;50 ;54

;55 rvork Diece Coordinate Systetn 2

catflnd i56 vork Diece Coordinate SYstem 3

;sz l,vo* Piece coordinate SYsteq 4-

i54 Vork piece Coordinate System ;58 tlorl oiece Coordinate System 5

i55 vork oiece Coordinate System 2 i59 piece coordinate

;56 Vork piece Goordinate SYst911l ;70

louoh Turninq canned CYcle;lE.i"-". c""rdinate Svstem 4 P71

;58 Vork piece Coordinate Systom 5 i72 ;tock removal Cutting Canned cycle

i59 Vork piece Coordinate SYstem 6 ;73

i70 nch Units i74 )eck Drilling Canned Cycle

i71 iletlic units i75 Groovinq canned Gycle

)80 :ancel Canned Cvcles i76 'hteadino Ganneo (;ycle

i8l;6;fi

;80 Cancel

:ounter Borinq Canned CYcle ;83 ace Drilling CYcle

ffi , P84 Taooino Cvclerace Boring Cycle

;84 aoDino Canned cycle ;86

i85 lorino Canned CYcle i87

ifficvcte P88 ine lapplng Lycre

i87i88?nq

lack Boring Ganned CYcle i89 Boring Gycle

lorinq Canned Cycle :90

ncremental Programminglorino Canned CYcle i9t

i90

i9t392

i93394

G95

eoa

\bsolute Positioning ;92 Canned

rcremental Positioning igit ind lace Turninq Canned CYcle

leoosition Origin Point ;96

lverse time feed i97 ;onstant sunace SEBeo

rer minute feed ;98 .inear Feed rate Per Time

,er revolution fued i99 reed rate Per Revolution

leturn to Retract (RaPidl PlaneTurning

ffi-I

-

I Program Stop ii00 Program Stop

it01 Optional Program StoP optbnal Program l'topPrcorem End

il02 Proqram End it02

ii03 Spindle On Clockwise HO3 Soindle On Clockwise

li0tl Spindle On Counterclockwise ttlOtl solndle On Counterclockwlse

il05 Spindle StoP il05 Soindle StoP

m06M07 Coolant I On

it07coolant On M08 Coolant 2 On

Itl08Coolant Off

Ill09

Clamps OnMt0

ttfi{ Clamps Ofl

it30 End of Proqram, Reset to Start M30 End of Proqram, Reset to Start

u98 SubDroqram Call M98 SubDrootam call

rr99 End subproqram and retum to main Program ir99 End suboroqram and return to main Program

Q}

csvT'{i

Time: Three hours Max Marks: $l{J

Min Pass Marks: 2f*

Note: Answer all questions.

(a) Explain "Design process" and its modified version by taking a suitatrle exanrple of"your own'/

tCI

(b) Write short notes on :

06(i) Computer aided engineering (CAE)(ii) Elements of CAD.

(a) Explain Geornetric Modelling and its types. {Xr

(b) F{ow the curves and surfaces are described in Geometric, Modelling? {}5

(c) Write dor'vn the different types of editing commands used in entities ancl rleir.functions. {}s{a) Expiain the procedure used in NC. {}S

Write down the advantages of CAD /CAM in NC programming. t}3

The component to be machined is shown in fig. All the holes making operation are tobe machined using ttre tools specified. The point to be noted in the atroye component is

at three different levels and as such the clearanee ptrane will lre diflerent for each o1'

these plane. Flenee" the port programme will have to take this into account rvhil e uslng {}E

the appropriate canned cycle.

!4qnlLi d"rt" ',J

r-1" s, 'r" l'

e:_ I 5 fufti" "tt'' ,i 'orie: M il {}ii7 g.1

B" Teeir.{seventh semester} Exarnination Nov-Dec 200gSubject: Computer Aided Design and Mfg.

Braneh: hdechanical Engineering

Q.1

Q.2

Q.3

(b)

(c)

P"T.O.

')^ r

----+ II

Steel .;'61>- 30 x I06 psi tAluminiumo t a : 10x 106psi

li5 _-_--;.-_- {\{

'Y J _-----tso *___l

d:2in

I inch

84

Q,4

o5

06

t)6

t},1

{}8

--1

I

(r0

4A

60__--__>

('a)' Explain Group technology, a-long with its advantages, disadvantages and Iimitalir:ns.(b) write down the types of GT machine ceils and exprain them.

(c) Explain flexible manufacturing system and its benefits.

(a) write down the major steps of finite elements analy,sis a.qcl explain

(b) Find the F"E' solution to the stepped bar for given problem geomerry ard dara.Assunrption :

\p,

Aluminium Aluminium

! ' !-_,

Code0870?5SB.Tech (Seventh Semester)

S u bj ect : Finite Elem ent Meth ods (Elective'Il)Brancb: I{echanical Engineei'ing

Max lrtarks:I'{rlVlinim um Pass If larks :3 5

AICTE

Time: Three Hours

o1

Q.,1

Q.4

Q.5

o.6

NOTE: Auempt aWfrye-luestions AII questions carrT'equal mark. Assmte suilabte daa ifrequired

Q.l By direct stiftress matd-x approach determine stiffiness matri-x for truss l0

element.

Derive expressions for narural coordinates in a ccnstant strain Tria-ngie

(CST) eiement.

Determine the shape funltions for 4 noded rectangJes element- Use natural

coordinates s)'stem.

Using serendipity concept find shape functions fro quadratic serendipil]'

family'element.

Derive stiffness matdx for a CST element by direct upptekU

Determine the extension of a tapered bar of letigtb. F0rnm due to seli-

rveight and a conc€ntrated load of 40C N appiied at iL< lower end. Given

the rvidth at top fixed end as i50mn. *idtb at lorver &ee end as 7-imrctfi

and ihickness as 20mm"

Q,? Discuss

(a) Coordinate transformation

tb) isoperimetric, sup€r parastetric & sub pann"lerric elernents

(c) Basic Theorem of isoperimetric concept.

Derive the expression for consistent load, n'hich vaies linearll'" firrrn P: ar

node I to P2 at node 2 on a beam element of lengfh le.

^il

:0

_l-!

-) l.t

li"r

2ClQ8

ination Nov-Dec- 2008

Code : 067023 -SI3.E. (Sevcnth Semester) Examinaticn, A,pril - May 2{J07

AICTE COURSESubject : Computer Aided Design & Manufacturing

Branch : Mechanical EngineeringMax. Marks : 100

Time : Three Hours Min. Marks : 35Note: All questions are compulsory. Preparc neat figures to support your answer. Use ofpart programming codes (G & M) are allowed.

Qu.1, a. Explain different fypes of automations in manufacturing by emphasizing its need.(l0)(or)

-j

;

::

l,':'.!

b. Explain the basic components of a CNC lnthe.Explain the following CNC part programming given below based

o A rod of 22 mm diameter is used for machining.olto

IBTLLET X22z.65N5 G2{ GS8N1O UO WO

N15 M06 T2N20 M03 51200

N25 GB?X22Z1N3e GSi Xztru3$ G01 Z-?5 tr45i\J4$ G*0 x22r€45 G00 z1N5S GCIT XzON55 G00 X221"J60 G00 zfN65 G01 X19N70 G01 Z-25N75 G00 X22N8CI GoS Z1sl85 G0't x18NSo GOt z-25N95 G00 X22N10G G00 21N'!05 G01 X'!7N110 GAl Z-25N115 GoS X22Nf20 G00 21N125 G01 X16N130 GAl Z-25N135 G00 X22

" N140 G00 Z1N145 Got X15N150 GAl Z-25Nf55 G00 X22Nf 60. G00 21N165 G28 US W0r{'x ZCI Mosf'1175 rd3CI

(10)on ISO coding.

(1s)

x3""n'"c$"

Qu. 2" a. The coordinates of fourpoints are given by.l'o : IZZ 0 ]t, Pr :123 0 ]t,Pr: [3 3 0lr, flnd P3 = [ 3 2 0 Ir. Find the parametric dquation of the Bezier curve, also plot the

' cun'e by determining minimum ten points on the curve. (10)(or)

b. Expiain the Area, subdi'r,ision method. Use suitable example with figures to explainihe same" (i0)c. A square of 1 unit lies in the XY plane with its two perpendicular sides in X and Yaxis. It is rotated 30o about the Y axis, followed by 45o rotation about the X axis,followed by translation of d:2i + 4j * 3k. Find the eoordinates of corner A ( 1,1) inthe final position. (15)

Qu. 3. a. Ekplain the D-H notations for assigning coordinate flarnes in serial roboticmanipulators, with exarnple. (10)

(o.)b. Obtain the rotation transformation matrix for rotation of moving frame ( OUVW)about the fixctl frame (OXYZ) for follorving slrccessive rotations - 45o about X, 30"about Y and 600 about X. (10)c. Obtain the direct hinematics model for the tool point P, of 3 * DOF- polar rnanipulatorarm, Fig.3( C). (15)

Qu. 4. a. Explain the expression for degrees oi' freedom, F = 3(n-l) - 2j for planar kileinaticchains, where n and j repre-sents number of links and joints respectively ivith examples.

(10)(or)

*ElE!

ffi$I

b. Explain coupler curves with examples. Also define double points, cusp andcoupler curves. :

crunode of(10)

threec. Design a four barpositions of the input

{nput ongi*0t :20o0z:35"

.

f} -

Ft!0u-l - *1v

mechanism by determining its link lengths, to coordinateand or-rtput links as fbllows:Otatput angleGlr:35"4)z :45''{r, :6qtr*. Assuile the fixerl Iin[< Xcngth :rs umit5,"

f ic ' 3qc)

{1s}

AICTE CO{JRSII Code : 077{}23 Mn.feen. (Sel'enth Scrnestel') Exan:rinaficll, Ilec-Jan ZE1S?-SE

Sub.iect : {J*nrputer Aided Design & h,IanulacfuringBrarrch : Meehanical Engineering

Max. &Garhs : l{.}t}Time : T'hree Hours Min. Marks : 3:iNote: All questions are compulsory. Prepare neat ligures to support your atrswer. Lise of p:rfiprogramrning codes (G & M) are allon ed.

at!1, a. Explain any trvo of the lbllorving in brief/- (i) Utiiity of CAD/CAM in product cycle.

, (ii) Basic comporients of automation.(iii) Difference in Conventional Machine'fools and CNC rnachine tools.

(10)

b. Write a part program for the component shown in Fig.1.(b) using C & M codes to machinethe component ou a CNC latl-re. 'fhe stock is 40mrn in dianreter, and 8$mm in length. 'fakespindle speed - 500rpm, work piece rotation - ciockwise and use coolant dur-ing rr-rachinilgoperation. Rough cut feed should be between 2 to 3 mm and finislr cut siror-rld be betrveen0.75 to t nrm. (xs)

(or)

--'€ ivt'it" u part program lorthe component shown iri Fig.l(c) using G & M codes tci nracirine

1 the cotnponent on a CNC milling machine. The depth of hc.rle is 10 rnnr, Z - $J at thcsurface of the work piece and cutting tool is positioned above the work piece surface. (lS)

t-I

llig. I(b)

6tl

Fig" l{ c)"l

i--../ z" [-r \,/,/,\\r- i ioi --i-,)-i\\.-/)j\\ , ,/ /\;--'

l

i--i------liiIi

f--_l _LrJ _ -- .

I

Il

I

I

I

I

r' fi10

f -f. )

10 -l

i I r..;

j

:i) t i.)

i

I

lrtrt

ili/F.\

I- 'i- -..t\

F

{ji

lIIrl

tsI

( i.l il )

r'r c

.y4 a. Exiriairi ltle area subdivislort rnefhocl. Use suirable example 1o explain the sarne tr.

b. ilevelop the ne*' coordinaies of, a point A {30,2t}}, if it rcflects aboul a1 axisthrougli origin a:-d making an arrgle of 30o in counter clock r,vise fl.oirr x axrs.

re*r r!1L \, .'

.\-+

(or)*-';,' Geuerate the expression lor weighing/basis ir-rnstions oi a er-rbic curve

cor-rdilio*s; Ps(X{i,Y{r), Pn.5(X6.5,ys.s), P,o.s (X,u.s, Y'o.s), tr}l(Xr,yt). plot thefour basis lunctions.

. fu.3. a. Find a hotrrogeneous translbrmation matrix T' lhat represents a rotation of u angle about thet"' [)X axis, followed by a translation of a unifs along th; OX axis. fbllowed by a tianslation ofd units along the OZ axis fcilcwed by a rotation of 0 angle about the OZ axis. iigi

(or)

- ,a-TheEuierian representation of angles used in aeronautics is knorvn as ro1l, pitch alc! yaw"\?/ lf the three successive rotations are 3Ou(yaw) about CX axis, 45'(pitch) aboilt Oy axis and30"(roll) about OZ axis. generate the final rotation matrix for'ihree successive eulerianrotations. (1S)

,'e. E)xplaiu the meaning of I{PP joint mnnipulator. Formulate the forward kinematjc:s nrlrcblU of the thuee degree of fieedorn (RPP) manipulator anl, F-ig.3( c). {1S)

passing

{rs)

u,iil'i ijtllorvingcurves lor tlre

(1s)

/'W 4. a, h,xplairi the ty;rc" numben

')x;!)" i,it i *-'r:i *It-

N';; ;N: 1)/r .:1 l

Ni iN_Ni I .N

,is . ,,\,i'.'j $'ti,

i lii\\\"l.ii\ lut j;'47,. :;:'/:;,:4.;: : '

lt,!j i(r )

and dinlension sylrthesis oI rucciialrisrns. { 10}

b. Generate the expression for coupler point (Xe, Ye) of the iour Lrar chain. I)rarr,, the counler

\_r,'a"ur,vtl cf the-coupler point E of a lbur bar planar mecha;iisin, Fig. 4(b) having the l.ollowingY data. AI] : 50mnr, BC : 66mnr, Ctr) : 90mm, AfJ : ICI$mm, BE : 3tlmnr, <CIlt{ : 3q;{Plot the cu've by varyirg input angle at a regular interval of'18".16' (1s)

FTC

h

c l,-ie't '\' - -

| ,--'&.8. (sevenrh sernesrg4pxao*$a*o0,, r{ov. - o-"Ir.#Ju:

067023 M

s n: bject, s'*0..,,tffiffrj&:% Ma n uractu ring. Branch : Mechanical Cngineering

T.ime : Three Hours Max. Marks : I00

o *uon"Jfr);;"HfJ:'Use of part programming fS-O .oOls (C g. p0 un* ulio*"A.'

Qu'll-a' "F'lexible -automation i.s nro!"e suitable for bafch productiorr amd'-/ Automation is rmore suitable foo fVl*rr-p.oiuotion,,. Justify thestatement by giving your reasons.

(or)b' compare.the ecornorny for fixed and fiexilrle automatio*i. with change of product in regular intervals.ii. with no*change of product.

Fixerlabove

(10)

(1r))

-,^, ;4:prain any rwo-of the foilowing part programming give' berow based on\-./ ISO coding.

i. Milling (1s)OT/o

:1002N5 G90 G20NIO MO6 T3Ni5 M03 S1250N2O COO XI YIN25 7A.iN30 Gat z_a.t25 F5N35. X3 Y2Ft1N40 Gja z1N45 XO YON50 M05N55 M30

1. T.urning%:102trN5 GgO G2I G4ON15 T0303N l7 M03N20 G00 z2MATN25 X45N30 G01Z_50FlN35 X40N4O Z2N45 X35NsO z-2sN5s x30N60Z_10

LT'.i).

Qu. 2. a. Develop the coordinates of a point if itclirection about a poinr A ( 30,20).

s3000 M03

s+t$@*'rotates by 30o in counter clock wise

(10)

suitable(10)

R shown invarying u

(1s)

N65 C00 x100 MOeN70 Zl00N80 M02

iii. Miilingdt/t

:1{}25Ns G92 X0 YA ZANt0 G90Nt5 C00 x25.0 Y25.0 Z2.0TArN20 C}t z-12.0F120N25 Y7s.0N30 x55.0N3s G02Y25.0I0 J_3s.0N40 X25.0N45 22.0N50 C00 2s0.0 M05N55 XO YON60 M30

'!. SIOJ :lR\,.-/ x;\\i.r''l

*-f i': :l1,

n

'l

tz/ (or)rt. Explain the Depth Euffer Method for back face removal. use\,/ exalnple witli figures to explain the same.

c. Generate the expressiorr for a Bezier surface that covers the region' Fig- 2(o ), Generate and plot minirnum twenty points on the surfac-e bya.ncl v.

: i,i

r''ilt ,tt4:

r)(ic (il 0) ;: (c- )

robotic rnanipulators rvith reierenceUse neat sketches to display the

(10)

,./ (or)

,4. Derive the rotation transformation matrix lor rotaiion of rnoving frame,/ I {-bTI\r!J/\ nhnrrf the fiwar{ frqmo (n\fv?\ f^,.9^ll^,,,i-^ ^,,^^^^^:.,^.-^a^+:^--^ A\-/ { C}U\IW) about the fixed f,rarne (OXYZ) for following successive rotations - dl

(10)P.T.O.

-, PlI (4,r1)

I

I

l

I

I

I

-_-l--.- _* xPi0 (4,0)"

///". l. a. Explain the Cartesian, cylindrical and polar

, / to their arrn conliguration and worl<space.\-/ joints and rvorkspace.

abogt X, d2 about Y and d3 about Z.

ffiC0D *|jor/-D eL*2rj.61' nTcre

o:l

i trr:e plc te'

iornt rrxis 2

i()/ [ oxi,; I

L rra <t (- )r r:r,r \J\\,/,/ I r!r,r.J\L-l/.",/q<1.,,{nxplain type, number and dimension synthesis of kinemaiic chains. (10)

,/ v (or)b. Derive the Freudenstein's equation: Kl cos 6,r - Kz cos 6z * Kl = Cos (62 - 6a)

for the c!lnnensionai s;rnthesis cf e fcur har funciic'rr^ generator siirrwn in fi;;ure-

Fig.a(b).Where tr(1 : li/lz,I(z : ll/la and Kr = (112 + lr'- irt + l4z )l 21214 (lCI)

ItI

'lI

Y

Yi

{ ,. --/i/'

I )' /'---l ^,' /, /-' ., -/,1, / ij------ /

1i/, ,',,1/' /t//1/ /i ,,,f /,^t/ti,( A',, :'il ' I n'i

.r ("1r, - r.- ,i-- -- - fdln.*' ,'l/.', / L*I' ill 4 (b)

/,r{, D*r"r*Lne tlte iink lengtlis of a four bar iinkage to generate the fuuction

,1 y: logroX for three o."uiu"y points X1 = 9.4, Xz = 5.5 and Xt : tr"6, in the

. intervaii 4_ f-<:10. Assume the smallest link lenglh as 5 crr}. Tabulate ilie

structural error for the given interval' (n5)

I'

IHtg

IE

CnD *Nc:r/.-bGC- >ffi €

AT C'T E

lr'

-,.* ):

. Fig.a(b)(or)

c. Design a four bar mechanisnr by deterrnining its link lengths, vvhen the motions o!'theinput ancl output links are governed by a function.y: x2 and x varies from 0 to 2 with anintdrvai of L The input angle vary from 50o to 150u and output angle varies Irom 80'to 160o.

Draw the three positions of the meclianism by selecting the length of the fixed link cl as

urlitv. (1s)

1 ;$,ro,;lz rgz z :.- ))/f,,,