GTU Machine Tool Design - May 2015 Exam Question Paper

GTU Mechanical Engineering (Semester 8)
Machine Tool Design
May 2015

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Explain design procedure of speed gear box.

7 M

1 (b) Enlist various requirement of machine tool. One of the requirements of machine tool should provide good surface finish, which depends on Machine tool vibrations. Explain how these vibrations can be controlled.

7 M

2 (a) Why geometric progression series is preferred over arithmetic progression series? Discuss their merits and demerits.

7 M

Answer any two question from Q2 (b) or Q2 (c)

2 (b) List various methods of obtaining step-less/ infinitely variable drives and explain with help of neat sketch step-less friction drive.

7 M

2 (c) Explain function of machine tool structure and also discuss about their requirement during design.

7 M

Answer any two question from Q3 (a), (b) or Q3 (c), (d)

3 (a) What is ray diagram? For 2×2 gear box transmitting 10 HP power which has a minimum ∑d? where d is the diameter of shaft. Which has better layout?

7 M

3 (b) Discuss in brief with neat sketch hydro dynamically lubricated slideway stating its load carrying capacity, advantage and disadvantages.

7 M

3 (c) A 2×2 drive is required to be designed for transmitting 12 HP with speed ranging from 400 rpm with φ= 1.4 . Select suitable structure from and optimum ray diagram.

7 M

3 (d) What are the advantages of using geometric progression for deciding the spindle speeds? Draw open and cross type structure diagram and possible ray diagram for this speed structure diagram for 2×2 drive having speeds N₁, N₂,N₃ and N₄.

7 M

Answer any two question from Q4 (a), (b) or Q4 (c), (d)

4 (a) Compare various section of bed and discuss how their rigidity of bed section is increased.

7 M

4 (b) Explain in detail with help of neat sketch the control of feed by limit switch.

7 M

4 (c) Explain hydraulic circuit for shaping and grinding machine.

7 M

4 (d) Compare various shapes of slide ways.

7 M

Answer any two question from Q5 (a), (b) or Q5 (c), (d)

5 (a) List various automatic machines and explain the automatic cutting of machine.

7 M

5 (b) Explain design procedure for a spindle of lathe machine.

7 M

5 (c) Choice of hydraulic circuit depends on which factors? Explain selection of electrical motor for a machine.

7 M

5 (d) Explain about recalculating ball screw for machine tool.

7 M

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