solved questions

SOLVED QUESTIONS

1. Explain the construction and working principle of a lathe with sketch.

[Dec '06]

Refer chapter 2.3 on Page 2.2.

2. What is lathe carriage? Explain the various parts of a lathe carriage with a neat diagram.

[Dec '05]

Refer Page 2.4.

3. Mention the specification of lathe with a neat sketch.

[Dec '10]

Refer chapter 2.4 on Page 2.7.

4. Describe the work holding devices in a lathe.

[Dec '06, Dec '10, May'13 & May'14]

Or

Name the various lathe accessories. How does a four jaw chuck differ from a three jaw chuck?

[Dec '10]

Refer chapter 2.8 on Page 2.17.

5. Explain the purpose of centres used in lathe.

[Nov '15]

Refer chapter 2.8.2 on Page 2.19.

6. Sketch the following work holding devices used in a lathe and state when they are used:

1. Self-centering three-jaw chuck

Refer Page 2.18.

2. Collet chuck, and

Refer Page 2.75.

3. Angle plate with face plate.

Refer chapter 2.8.4 on Page 2.21.

7. Draw neat sketches of steady and follower rests and brief their applications.

[May'11]

Refer 2.8.6 on Page 2.23.

8. Describe the types of machining operations that can be performed on a lathe, with a neat sketch. 

[May'17 & Nov '17]

Refer chapter 2.9 on Page 2.24.

9. Explain the significance of operations facing and turning performed in the lathe with reference to the change in the geometry of the workpiece. 

[Apr'19]

Refer chapter 2.9.2 on Page 2.24 for turning and chapter 2.9.4 on Page 2.26 for facing.

10. Explain why the sequence of drilling, boring and reaming produces a hole that is more accurate than sequence of drilling and reaming.

[Nov'17]

Refer Page 2.30.

11. Spell in detail the procedure for taper turning process of cylindrical rod. 

[Nov '18]

Refer chapter 2.9.18 on Page 2.31.

12. Explain the thread cutting operation in a lathe with a neat sketch. Also make a note on knurling, grooving and forming operations in a lathe. 

[June '06 & May'16]

Refer chapter 2.9.19 on Page 2.31 for thread cutting, chapter 2.9.6 on Page 2.26 for knurling, chapter 2.9.9 on Page 2.27 for grooving and chapter 2.9.8 on Page 2.27 for forming.

13. (i) Detail the procedure for thread cutting operation.

(ii) How special attachments help in improving the procedure?

[Nov '18 & Nov '19]

Refer chapter 2.9.19 on Page 2.31:

14. What is the profile of the threads in the lead screw in a central lathe? Justify your answer.

[Apr'19]

Refer Page 2.35.

15. Explain with neat sketches the working principle of taper turning operation using a form tool.

[Nov '13]

Refer chapter 2.10.1 on Page 2.38.

16. Explain the following with a neat sketch:

(i) Taper turning by swivelling the compound rest

[Nov '03, Nov'04, Dec '06, Dec '10, May'11, Nov '13, May'14 & Apr'18]

Refer chapter 2.10.3 on Page 2.39.

(ii) Taper turning attachment method

 [Nov '03, Nov'04, Dec '06, Dec '10, May'11, May'14 & Apr'18]

Refer chapter 2.10.4 on Page 2.40.

(iii) Taper turning with tailstock set over method.

[Nov'03, Nov'04, Dec '06, Dec '10, May'11 & May'14]

Refer chapter 2.10.2 on Page 2.38.

17. Enumerate the various methods of producing taper.

[Nov '15]

Refer chapter 2.10.1-2.10.4 on Page 2.38-2.41.

18. What are the various methods available for supporting long components and fragile components in a lathe? Explain with sketches.

[May '16]

Refer chapter 2.8.6 on Page 2.23 for supporting long components and Page 2.75 for supporting fragile components.

19. Enumerate the purpose of various attachments used on a centre lathe.

[Dec '05, Dec '06, May'11, May'13 & May'15]

Refer chapter 2.13 on Page 2.49.

20. Enumerate with a neat diagram the principal parts of capstan and turret lathe.

Refer chapter 2.19.1 on Page 2.67.

[May 10 & May'16]

21. Enumerate the constructional details and working principle of turret indexing mechanism in Capstan and turret lathes.

[Apr'18]

Refer chapter 2.19.2 on Page 2.71.

22. Explain the working principle of turret lathe.

[May'13]

Refer chapter 2.19.4 on Page 2.72.

23. Explain the following with suitable sketches.

(1) Turret indexing mechanism or Geneva mechanism

Refer chapter 2.19.2 on Page 2.71.

(2) Bar feed mechanism.

[May'11 & Dec'11]

Refer chapter 2.19.3 on Page 2.72.

24. Describe the special features of a turret lathe, with a line sketch. Also mention any two advantages of it.

[June '06 & Dec'11]

Refer chapter 2.19 on Page 2.66 and 2.19.6 on Page 2.73 respectively.

25. Write down the differences between a capstan and a turret lathe.

[Dec '06 & Nov '13]

Refer chapter 2.19.7 on Page 2.74.

26. Briefly explain with a neat sketch, the types of work holding devices that are commonly employed in automatic lathe. Also specify its limitations.

[Nov '15]

Refer chapter 2.19.8 on Page 2.74.

27. Name the important and widely used tool holding devices used in a turret lathe. [Nov 19]

Refer chapter 2.19.9 on Page 2.77.

28. What is meant by 'Tool layout' of a turret lathe?

[May'10]

Refer chapter 2.20 on Page 2.83.

29. Explain the tooling layout for the production of a hexagonal bolt in a capstan lathe.

[Nov'03 & Nov'04]

Refer Problem 2.25 on Page 2.91.

30. What are the advantages of automatic machines?

[Nov '04] 

Refer chapter 2.21.1 on Page 2.101.

31. Explain the classification of automatic lathes.

 [Apr'17]

Refer chapter 2.21.2 on Page 2.102.

32. Discuss about the construction and working principle of single spindle automatic screw type machine with illustrative sketch.

[May '15 & Nov '18]

Refer chapter 2.22 on Page 2.104.

33. Describe the method of operation of the Swiss-type automatic lathe, with application and tools used.

[Nov 03, Apr 04, Dec '05, Dec '06, May'10May'11, Dec'11, Nov '13, May'14, May'17 & Nov '17]

Refer chapter 2.22.2 on Page 2.107.

34. Explain the salient features of an automatic screw machines.

[Apr '04, Dec'06, May'12, May'13 & May'15]

Refer chapter 2.22.3 on Page 2.109.

35. Classify transfer machines.

[Nov '03, Apr 04 & May'10]

Refer chapter 2.23 on Page 2.111.

36. Explain parallel action and progressive action multi-spindle automatics.

[June '06, Dec '06, May'14 & May'16]

Refer chapter 2.24.3 on Page 2.112 for parallel action and chapter 2.24.4 on Page 2.113 for progressive action automatics.

37. Make a comparison of operational and other features of single spindle and multispindle automatic lathes.

[Apr '04 & May'12]

Refer chapter 2.24.6 on Page 2.115.