Mild steel
Cast iron
High speed steel
High carbon steel
B. Cast iron
Increases tool life
Decreases tool life
Produces chipping and decreases tool life
Results in excessive stress concentration and greater heat generation
Wear of bond
Breaking of abrasive grains
Wear of abrasive grains
Cracks on grinding wheel
Silicon carbide
Aluminium oxide
Sand stone
Diamond
0.20
0.30
0.50
0.60
Continuous chips
Discontinuous chip
Continuous chips with built up edge
None of these
Reduce built up edge
Break up chips
Improve machinability
All of these
0.1 mm
0.4 mm
0.35
0.75 mm
Increase in coefficient of friction
Decrease in coefficient of friction
Decrease in roll radius
Decrease in roll velocity
Ceramic
Stellite
Diamond
Cemented carbide
Internal and external surfaces
Round or irregular shaped holes
External flat and contoured surfaces
All of these
Conventional milling
Climb milling
End milling
Face milling
20°
30°
45°
60°
Friction zone
Work-tool contact zone
Shear zone
None of these
Softer metals
Cotton fabric
Carbon
Graphite
Minimum at the beginning of the cut and maximum at the end of the cut
Maximum at the beginning of the cut and minimum at the end of the cut
Uniform throughout the cut
None of these
Boring
Drilling
Reaming
Internal turning
10 to 20 m/min
18 to 30 m/min
24 to 45 m/min
60 to 90 m/min
Wheel is too hard or wheel revolves at a very high speed
Wheel is too soft or wheel revolves at a very slow speed
Wheel is too hard and wheel revolves at very slow speed
Wheel is too soft and wheel revolves at a very high speed
The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face
The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face
Electrochemical machining
Electro-discharge machining
Ultrasonic machining
None of these
Direction of the tool axis
Direction of tool travel
Perpendicular to the direction of the tool axis
Central plane of the workpiece
Direct indexing
Simple indexing
Compound indexing
Differential indexing
Using abrasive slurry between the tool and work
Direct contact of tool with the work
Maintaining an electrolyte between the work and tool in a very small gap between the two
Erosion caused by rapidly recurring spark discharges between the tool and work
Face
Fillet
Land
Lead
Thread cutting
Turning a work of larger diameter
Turning a hard or tough material
All of these
Amount of material to be removed
Hardness of material being ground
Finish desired
All of these
Counter-boring
Grooving
Knurling
Facing
3° to 8°
20° to 30°
60° to 90°
90° to 120°
Tool steels
Sintered carbides
Glass
All of these
To produce good surface finish and high degree of accuracy
To remove considerable amount of metal without regard to accuracy of the finished surface
To grind exterior cylindrical surfaces
Any one of the above