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
Fixtures are used

None of these
For holding and guiding the tool in drilling, reaming or tapping operations
To check the accuracy of workpiece
For holding the work in milling, grinding, planing or turning operations

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