Production Process 2 - Dec 2014

Mechanical Engineering (Semester 4)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

Attempt any four:-

1 (a) Show that in metal cutting operation $V_c = V.r_c$ (5 marks) 1 (b) Describe Radial drilling machine with neat sketch. (5 marks) 1 (c) Explain orthogonal rake system.(5 marks) 1 (d) Describe internal grinding machine with neat sketch.(5 marks) 1 (e) Discuss cutting fluids.(5 marks) 2 (a) Write a part programme using G-code and M code for machine external contour and drilling hole, at the centre as shown in figure. All dimensions are in mm

  (10 marks) 2 (b) Derive the relationship 2?+??=π/2 in merchant's theory. Clearly stating the assumptions.(10 marks) 3 (a) Explain the various steps involved in designing circular pull type broach. Draw appropriate sketches.(10 marks) 3 (b) Derive expression for tool life for minimum cost criteria in metal cutting.(10 marks) 4 (a) Describe carbides and ceramics as cutting tools.(10 marks) 4 (b) Draw two dimensional tool dynamometer and explain it features.(5 marks) 4 (c) List gear manufacturing methods explain any one in detail with neat sketch.(5 marks) 5 (a) Explain with an example, graphical method of designing form tool.(10 marks) 5 (b) A work-piece of 38mm diameter is being turned on a lathe with a tool having rake angle of 33° and feed of 0.15 mm/rev. The length of chip over one revolution of work-piece is 72mm. The cutting speed is 12.5 m/min the tangential force is 410 N and force is 170N
Calculate-
i) Coefficient of friction on a rake race
ii) Thickness of chip
iii) Velocity of shear
iv) Velocity of chip along the tool face.(10 marks)

Write short notes on (any four)-

6 (a) Lapping and honing(5 marks) 6 (b) Dressing and truing of grinding wheel(5 marks) 6 (c) Co-ordinate measuring machine(5 marks) 6 (d) Nomenclature of drilling tool(5 marks) 6 (e) Geometry of Milling cutter.(5 marks)