The relation between tool life (T) and cutting speed (V) is VTn = Constant. In this relation, the value of n depends upon
Work material
Tool material
Working conditions
Type of chip produced
Correct Answer :
B. Tool material
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8 to 30 mm
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Milling
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Wheel is too soft or wheel revolves at a very slow speed
Wheel is too hard and wheel revolves at very slow speed
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A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is
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20 mm
100 mm
The relation between tool life (T) and cutting speed (V) is VTn = Constant. In this relation, the value of n depends upon
Work material
Tool material
Working conditions
Type of chip produced
A dense structure of a grinding wheel is used for
Hard materials
Brittle materials
Finishing cuts
All of these
The tool life is said to be over if
Poor surface finish is obtained
There is sudden increase in cutting forces and power consumption
Overheating and fuming due to heat of friction starts
All of the above
The angle between the lathe centres is
30°
45°
60°
90°
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Longitudinally
Crosswise
Vertically
All of these
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Plastics
Copper
Cast steel
Carbon steel
Surface grinding is done to produce
Tapered surface
Flat surface
Internal cylindrical holes
All of these
Misrun is a casting defect which occurs due to
Very high pouring temperature of the metal
Insufficient fluidity of the molten metal
Absorption of gases by the liquid metal
Improper alignment of the mould flasks
Tool life is generally better when
Grain size of the metal is large
Grain size of the metal is small
Hard constituents are present in the microstructure of the tool material
None of the above
Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as
Cold shut
Swell
Sand wash
Scab
Larger end cutting edge angle _________ tool life.
Increases
Decreases
Does not effect
None of these
A coarse grained grinding wheel is used to grind
Hard and brittle materials
Soft and ductile materials
Hard and ductile materials
Soft and brittle materials