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
Smoothing and squaring the surface around a hole
Making a cone-shaped enlargement of the end of a hole

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Manufacturing And Production Technology
Side rake angle of a single point cutting tool is the angle

Between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of the tool
Between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base
By which the face of the tool is inclined sideways
By which the face of the tool is inclined towards back

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