Manufacturing And Production Technology
Trepanning is an operation of

Producing a hole by removing metal along the circumference of a hollow cutting tool
Sizing and finishing a small diameter hole
Making a cone-shaped enlargement of the end of a hole
Smoothing and squaring the surface around a hole

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Manufacturing And Production Technology
The lip angle is the angle

None of the listed here
Between the face of the tool and a line tangent to the machined surface at the cutting point
Made by the face of the tool and the plane parallel to the base of the cutting tool
Between the tool face and the ground end surface of flank

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