Manufacturing And Production Technology
Lapping is an operation of

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

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Manufacturing And Production Technology
The lip clearance angle is the angle formed by the

Flank and a plane at right angles to the drill axis
Leading edge of the land with a plane having the axis of the drill
Chisel edge and the lip as viewed from the end of a drill
None of the listed here

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