Manufacturing And Production Technology
Threading is an operation of

Smoothing and squaring the surface around a hole
Sizing and finishing a small diameter hole
Cutting helical grooves on the external cylindrical surface
Producing a hole by removing metal along the circumference of a hollow cutting tool

ANSWER DOWNLOAD EXAMIANS APP

Manufacturing And Production Technology
The facing is an operation of

Embossing a diamond shaped pattern on the surface of a workpiece
Machining the ends of a workpiece to produce a flat surface square with the axis
Beveling the extreme end of a workpiece
Reducing the diameter of a workpiece over a very narrow surface

ANSWER DOWNLOAD EXAMIANS APP