Flat drill
Straight fluted drill
Parallel shank twist drill
Tapered shank twist drill
B. Straight fluted drill
0.005 to 0.01 mm
0.01 to 0.1 mm
0.05 to 0.1 mm
0.5 to 1 mm
Wear of bond
Breaking of abrasive grains
Wear of abrasive grains
Cracks on grinding wheel
Four jaw independent chuck
Three jaw universal chuck
Magnetic chuck
Drill chuck
Equal to 30°
Less than 30°
More than 30°
None of these
Lower chip-tool contact area and larger shear angle
Higher chip-tool contact area and smaller shear angle
Lower chip-tool contact area and smaller shear angle
Higher chip-tool contact area and larger shear angle
Shank, material and diameter
Shank, lip angle and size of flute
Material, length of body and helix angle
Any one of these
Of maximum diameter 15 mm
In 15 mm thick plates
Having cross-sectional area of 15 mm²
None of these
Taper tap
Second tap
Bottoming tap
Any one of these
Distortion
Warping
Porous weld
Poor fusion
Brass
Copper
Copper tungsten alloy
All of these
Improve the accuracy of location
Reduce the tendency to over-index
Improve upon the acceleration and deceleration characteristics
Reduce the cycle time
Course grained
Medium grained
Fine grained
None of these
3.75 m/min
5 m/min
7.5 m/min
15 m/min
Cold shut
Swell
Sand wash
Scab
Coefficient of friction
Microstructure
Work hardening characteristics
All of these
Feed rate, depth of cut, cutting speed
Depth of cut, cutting speed, feed rate
Cutting speed, feed rate, depth of cut
Feed rate, cutting speed, depth of cut
Soft grade
Medium grade
Hard grade
None of these
Length between centres
Swing diameter over the bed
Swing diameter over the carriage
All of these
A to H
I to P
Q to Z
A to P
Morse taper
Seller's taper
Chapman taper
Brown and Sharpe taper
The workpiece is supported throughout its entire length as grinding takes place.
It is a continuous process and adopted for production work.
It requires no holding device for the work.
All of the above
Cast iron
Mild steel
Brass
Aluminium
Water
Soluble oil
Dry
Heavy oils
Annealing
Cyaniding
Normalizing
Tempering
Nose part, front relief face and side relief face of the cutting tool
Face of the cutting tool at a short distance from the cutting edge only
Cutting edge only
Front face only
5 to 10 m/min
10 to 20 m/min
20 to 30 m/min
40 to 60 m/min
Equal to
Less than
More than
None of these
Friction zone
Work-tool contact zone
Shear zone
None of these
Material of drill
Type of material to be drilled
Quality of surface finish desired
All of these
Its end tapered for about three or four threads
Its end tapered for about eight or ten threads
Full threads for the whole of its length
None of the above