Manufacturing And Production Technology
Trepanning is an operation of

Smoothing and squaring the surface around a hole
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
Sizing and finishing a small diameter hole

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Manufacturing And Production Technology
A jig is defined as a device which

Holds and locates a workpiece and guides and controls one or more cutting tools
All of these
Is used to check the accuracy of workpiece
Holds and locates a workpiece during an inspection or for a manufacturing operation

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