STUPIDSID
1 (a)
With suitable sketches, explain different types of chips produced during machining.
7 M
1 (b)
Discuss the causes for tool failure.
7 M
1 (c)
In an orthogonal cutting the following observation were made: Feed=0.25mm/rev Chip thickness=0.8mm
Depth of cut=2mm Length of chip -tool contact=0.5mm
Working rake angle=0° cutting force=F=1800N
Axial trust=900N
Determine:
i) The mean angle of friction of tool face .
ii) The mean shear strenghth of the work material.
iii) The maximum frictional stress on tool face.
Depth of cut=2mm Length of chip -tool contact=0.5mm
Working rake angle=0° cutting force=F=1800N
Axial trust=900N
Determine:
i) The mean angle of friction of tool face .
ii) The mean shear strenghth of the work material.
iii) The maximum frictional stress on tool face.
6 M
2 (a)
Draw the sketches showing sources of heat and heat distribution to various elements during metal cutting.
10 M
2 (b)
Discuss the effect of temperature an hardness for different cutting tool material.
6 M
2 (c)
List and explain the characteristics features of good cutting tool material.
4 M
3 (a)
What are the difference between a capstan lathe and a turret lathe?
6 M
3 (b)
Find the time required for taking a complete cut on a plate 6000mm length × 300mm width if the cutting speed is 9 m/min. The return time to cutting ratio is 1:4 and the feed is 3mm. The clearance at each and is 75mm.
6 M
3 (c)
List out the differences between shaper and planer.
8 M
4 (a)
With suitable sketches, explain the following operation using drilling machine:
i) Trepanning
ii)Tapping
iii) Boring
iv) Reaming
i) Trepanning
ii)Tapping
iii) Boring
iv) Reaming
12 M
4 (b)
Define x,y and z axes on a NC drill machine.
4 M
4 (c)
Explain point-to-point positioning control system of tool in NC system.
4 M
5 (a)
With suitable sketches explain the following milling machine operation:
i) Form milling
ii)Gang milling
i) Form milling
ii)Gang milling
8 M
5 (b)
Draw the neat sketches showing all the elements of plain milling cutter and label all parts.
6 M
5 (c)
Name various work holding devices used in milling machine and indicate their uses.
6 M
6 (a)
What are the difference of grinding machine over shaping machine?
5 M
6 (b)
List and explain different abrasive materials used in grinding wheel.
5 M
6 (c)
How a grinding wheel is marked? Describe Indian standard marking system.
5 M
6 (d)
Briefly explain the constructional features of grinding machine.
5 M
7 (a)
What is broach? How broaches are classified?
5 M
7 (b)
What are the limitations of broaching process?
5 M
7 (c)
Briefly explain the following surface finishing operations:
i) Buffing
ii)Polishing.
i) Buffing
ii)Polishing.
10 M
8 (a)
With suitable sketches, explain Abrasive jet machining.
5 M
8 (b)
Discuss the effect of cutting parameters in USM
5 M
8 (c)
What are the advantages and disadvantages of ECM?
5 M
8 (d)
List the essential requirements of dielectric fluid used in EDM.
5 M
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