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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
Set No 4
-------------------
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) When the use of positive rake angles and negative rake angles is recommended? [6]
(b) Give significance of providing nose radius. [4]
(c) Describe the tool represented by 10,10,6,6,8,8,1. [6]
2. (a) Give in detail classification of lathe. [12]
(b) Why lathe beds are made of cast iron? Explain. [4]
3. (a) What are the differences between a capstan lathe and turret lathe? [6]
(b) Explain with help of suitable sketches, different tool holders used in turretlathe. [10]
4. What are various work holding devices used in shaper? Discuss them with help of neat sketches. [16]
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 characteristics that distinguish a milling process from other machining processes. [8]
(b) Describe the differences between a lathe and milling machine in terms of the types of surfaces generated , the types of tools used and applicability for general and production applications. [8]
7. (a) What are the advantages and limitations of using centreless grinding? [8]
(b) Describe the dressing and balancing requirements in grinding. [8]
8. Compare the broaching operation with that of any other metal machining operation for the purpose of generating constant inside contours. Show sketches of some example jobs made using broaching. [16]
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