Manufacturing And Production Technology
Jigs are used

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

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Manufacturing And Production Technology
Threading 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
Cutting helical grooves on the external cylindrical surface
Smoothing and squaring the surface around a hole

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