Question Paper: Manufacturing Process-II : Question Paper Dec 2015 - Mechanical Engineering (Semester 6) | Pune University (PU)
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Manufacturing Process-II - Dec 2015

Mechanical Engg (Semester 6)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.


Solve any one question from Q1 and Q2

1 (a) Differentiate between Honing and Lapping process.(6 marks) 1 (b) Calculate the Index Crank movement for 69 divisions by compound indexing methods.
Hole circles are,
Plate I : 15, 16, 17, 18, 19, 20
Plate II : 21, 23, 27, 29, 31, 33
Plate III : 37, 39, 41, 43, 47, 49
(6 marks)
10 (a) List various types of locating devices using in jig and fixtures. Explain any one in detail.(6 marks) 10 (b) Draw and Explain Diamond pin locators.(4 marks) 10 (c) Design and draw milling fixture for milling slot of 10 mm wide, 10 mm deep and 20 mm in length for the component shown in fig. (a).

(8 marks) 2 (a) Sketch and Explain following drilling operations:
i) Countersinking
ii) Trepanning
iii) Spot facing
(6 marks)
2 (b) Explain the meaning of each letter mentioned on the following grinding wheel.
'W-C-10-E-5-V-17'.
(6 marks)


Solve any one question from Q3 and Q4

3 (a) Draw the Merchant's circle of forces and explain the different quantities involved.(4 marks) 3 (b) A tool life of 60 minute is obtained at a speed of 25 m/min and 6 minute at 50 m/min. Calculate the following
i) Tool life equation.
ii) Cutting speed for 4 minute tool life.
(4 marks)
4 (a) Draw neat sketch of single point cutting tool geometry.(4 marks) 4 (b) Explain different types of chips.(4 marks)


Solve any one question from Q5 and Q6

5 (a) Explain ECM process with its advantages, limitations and applications.(8 marks) 5 (b) Explain AJM process with its advantages, limitations and applications.(8 marks) 6 (a) Draw a Schematic diagram of 'Electro-discharge Machining' and Explain its working principle and process parameters.(8 marks) 6 (b) Explain USM process with its advantages, limitations and applications.(8 marks) 7 (a) Explain CNC machines with neat sketch. State its advantages and limitations.(6 marks)


Solve any one question from Q7 and Q8

7 (b) Explain meaning of 2 axis, 3axis, 5 axis CNC machines.(3 marks) 7 (c) Write a part program for component shown in fig. Assume that spindle speed of 400 rpm and feed is 0.3mm/rev.

(7 marks) 8 (a) Draw block diagram of DNC system and compare DNC and CNC system.(8 marks) 8 (b) Differentiate between open loop and close loop system.(4 marks) 8 (c) Explain the following codes
G03, M30, G90, M08
(4 marks)


Solve any one question from Q9 and Q10

9 (a) Define Jig and Fixture. Differentiate between them with suitable examples.(5 marks) 9 (b) Write short notes on modular fixture.(5 marks) 9 (c) Design and draw drilling jig for drilling the ϕ 10 mm holes in the component shown in fig. (a).(8 marks)

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