Manufacturing And Production Technology
Trepanning is an operation of

Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
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
A better machinable metal is one which gives

Higher chip-tool contact area and smaller shear angle
Higher chip-tool contact area and larger shear angle
Lower chip-tool contact area and larger shear angle
Lower chip-tool contact area and smaller shear angle

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