59) A cone has a base diameter of 20 mm and the slant height is 30 mm. What is the surface area in square millimeter?

60) Angle between the top face of cutting point and normal (90 degree) to the work surface at the cutting edge

61) If the major diameter of an ISO metric thread is 6 mm and the pitch is 1 mm the recommended tap drill diameter is

62) If the recommended cutting speed of mild steel is 20 m/min, what is the rotational speed (rpm) required for a Dia=20 mm drill bit?

63) Tool will rub against the work surfaces and the cutting force increases when