Question Paper: Manufacturing Process-II : Question Paper Dec 2016 - Mechanical Engineering (Semester 6) | Pune University (PU)
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Manufacturing Process-II - Dec 2016

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.
1(a) Draw a neat sketch of twist drill with its nomenclature and explain various terminologies of twist drill.(6 marks) 1(b) A hole of 25 mm diameter and 70 mm depth is to bedrilled. The suggested feed 1.3 mm/rev. and cutting speed 60m/min. assuming tool approach and tool overtravel as 6mm, Calculate:
i) Spindle Speed
ii) Feed Speed
iii) Cutting Speed
(6 marks)
10(a) List various types of locating devices used in jiig and fixtures. Explain any one in detail.(6 marks) 10(b) Write short notes on modular fixture.(4 marks) 10(c) Design and draw milling fixture for miling slot of 10 mm wide, 5 mm deep and 25 mm is length for the component shown in fig. (a)
!mage
(8 marks)
2( b) Write short notes on Burnishing Process.(6 marks) 2(a) Describe the Tool and Cutter grinder with neat sketch.(6 marks) 3(a) In orthogonal cutting of a 60mm diameter MS bar on lathe, the following data was obtained:
Rake angle = 10°,
Cutting Speed = 100m/min,
Cutting force =200N,
Feed Force =70N,
Chip thickness =0.3mm,
feed =0.2mm/rev. Calculate:
i) Shear angle
ii) Coefficient of friction
iii) Chip flow Velocity
iv) Friction Angle
(4 marks)
3(b) Explain chip breakers with its function?(4 marks) 4(a) With the help of neat sketch explain the relation between shear velocity, cutting velocity and chip flow velocity.(4 marks) 4(b) What is Machinability? Explain different factors affecting Machinability.(4 marks) 5(a) Explain USM process with its adv, limitations and applications.(8 marks) 5(b) Compare the ECM and EDM with various process parameters.(8 marks) 6(a) Draw a Schematic diagram of 'Laser Beam Machining' and Explain its working principle and process parameters.(8 marks) 6(b) Explain AJM process with its adv, limitations and applications.(8 marks) 7(a) Explain DNC machines with neat sketch. State its advantages and limitations.(5 marks) 7(b) Explain with neat sketch NC motion control system.(4 marks) 7(c) Write a part program for component show in fig. Assume that spindle speed of 400rpm and feed is 0.3mm/rev.
!mage
(7 marks)
8(a) Explain machining center with neat sketch. State its advantages, disadvantages and applications.(6 marks) 8(b) Differeniate between open and close loop system with neat sketch.(6 marks) 8(c) Explain the following code
G03
M00
G91
M08.
(4 marks)
9(a) What is 3-2-1 location principle? Explain with neat sketches.(6 marks) 9(b) Draw and explain diamond pin locator.(4 marks) 9(c) Design and draw drilling jig for drilling the φ 10mm holes in the component show in fig.(a)(8 marks)

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