High carbon steels are machined using tools having

42) If the recommended cutting speed of mild steel is 20 m/min, what is the rotational speed (rpm) required for a 020 mm drill bit.

43) The angle of the prick punch used for witness marks is

44) Helix angle in twist drill determines the

45) For a turning operation, if the spindle speed is 128 rpm and the diameter of the rod is 25 mm, what is the cutting speed?