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Posted By: Sra1 Member Level: Diamond Posted Date: 27 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Mechanical Engineering MACHINE TOOLS (Supplimentary Examinations, Aug/Sep 2007) Question paper
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Set No 1
---------------------
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Prove that tanf= rcosa/1 - rsina where f is shear angle, r chip thickness
ratio and a a is rake angle. [6]
(b) A mild steel bar of 50mm diameter was orthogonally machined on lathe. Its
feed rate 0.5mmm/rev, chip thickness 1.2mm, rotational speed 100rpm, rake
angle 140, Calculate chip thickness ratio, shear angle, Chip reduction ratio
[10]
2. (a) What are the different types of taper turning attachments attached to lathed?
Discuss them briefly. [8]
(b) Classify the Lathe machines and explain their important advantages. [8]
3. What are the main parts of capstan and turret lathes? Describe in brief with help
of suitable illustrations? [16]
4. (a) How is shaping machine specified? [4]
(b) Describe with help of neat sketch, principal parts of shaper? [12]
5. (a) What is the general rule regarding the included angle of the drill point and
the hardness of the material being drilled? [6]
(b) What is taper control drilling? Why the spiral point drilling is particularly
adequate for this? [6]
(c) What is the advantage of using a drill Jig for mass production? [4]
6. (a) Explain the principle of gear hobbing [4]
(b) Write a note on the following [12]
i. Reciprocal milling
ii. Index milling
7. (a) Explain how the surface finish of carbide turning tools can be improved by
grinding. [8]
(b) Explain the process of wear of a grinding wheel. [8]
8. (a) Explain the different teeth in a broaching tool. [8]
(b) Explain clearly the advantages and limitations of Broaching. [8]
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