Anna University Chennai 2006-2nd Sem B.Tech II Supplementary s, il/ - Question Paper

II B.Tech II Semester Supplementary Examinations, April/May 2006
MACHINE TOOL ENGINEERING
(Production Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
? ? ? ? ?
1. (a) elaborate the requirements of good cutting tool material? [4]
(b) elaborate the assumptions made by Merchant in his 1st theory relating to
the mechanics of metal cutting? [4]
(c) In an orthogonal cutting experiment, the tangential force was 150kg and the
feed force 100kg. The rake angle of tool was 10
0
and the chip thickness ratio
was 0.35. obtain the compressive and shear forces on the shear plane and also
the coefficient of friction of the chip on the tool face. [8]
2. (a) Under what conditions discontinuous chips are formed? [3]
(b) Sketch a 3 view diagram of a 25mm square tool bit having tool signature
(according to ASA) of : 15,15,10,10,15,10 (3mm). [5]
(c) How is a lathe specified? (Line diagram of lathe may be drawn for identifying
major parameters). [5]
(d) Write a brief note on the use of ceramics as cutting tool material. [3]
3. (a) Make a simplified sketch (Line diagram) of a Swiss-Type automatic machine
and indicate all the parts on it. In what way it differs from Turret-Type
automatic screw machine? [8]
(b) compute the change gears for cutting R.H. single begin threads of 0.25” pitch
on a lathe having a lead screw of 8mm lead. Make neat sketch (two views) of
the arrangement of gears. [8]
4. (a) Write 4 differences ranging from a capstan lathe and a Turret Lathe. [4]
(b) A brass pin has a length of 500mm and of 40mm diameter. obtain the turning
time to decrease the pin to 38.8mm in 1 pass, when the cutting speed is 60
metres/minute and feed is 0.8mm/minute. [4]
(c) With a block diagram show the main features of a horizontal boring machine.
provide its applications. [6]
(d) How do you specify the size of a Radial Drilling Machine. [2]
5. (a) Depict the subsequent operations done on a drilling machine and indicate the
main items on them:
i. Reaming
ii. Spot Facing
iii. Counter-Sinking
iv. Tapping. [4x2=8]
(b) A 10mm drilled hole in a casting of 10mm thickness is to be brought in align-
ment by boring. compute the time taken in boring operation assuming a
cutting speed of 30 metres/minute and feed 0.13mm/rev. [4]
(c) Brie y outline the salient features of a Deep Hole Drilling Machine. provide its
applications. [4]
6. (a) Make a neat sketch of a Twist Drill and show all important features and angles
on it. [5]
(b) Show the block diagram of a Jig Boring Machine and tag it. elaborate its
applications? [5]
(c) define the operation of cutting a dovetail bearing on a shaper. [6]
7. (a) Determine the time needed to mill a slot in a work piece of 300mm length
with a side milling cutter of 100mm diameter, 25mm wide and 18 teeth. The
depth of cut is 5mm and the feed per tooth is 0.1mm. Cutting speed used is
30 metres/min. [8]
(b) explain with the help of sketches the characteristics of Up milling and Down
milling.
[5]
(c) Depict the operation of milling a closed profile key-way on the shaft and
indicate the 2 main items on it. [3]
8. (a) What is meant by “Truing” of a grinding wheel. [2]
(b) What is the name of the grinding machine mainly employed for sharpening
(grinding) of cutting tools? [2]
(c) Name the finishing process employed for smooth finishing of gage blocks. [2]
(d) What is the phenomenon known as “Wheel Loading”? [2]
(e) discuss the principle of centreless grinding. discuss with neat sketches “Through
Feed”, “Infeed” and “End Feed” methods of centreless grinding. provide appli-
cations for every. [8]

Earning:   Approval pending.