Manufacturing And Production Technology
Threading is an operation of

Smoothing and squaring the surface around a hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Sizing and finishing a small diameter hole
Cutting helical grooves on the external cylindrical surface

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Manufacturing And Production Technology
Fixtures are used

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

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