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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Manufacturing And Production Technology
Jigs are used

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

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Manufacturing And Production Technology
In ultrasonic machining, the metal is removed by

Direct contact of tool with the work
Erosion caused by rapidly recurring spark discharges between the tool and work
Using abrasive slurry between the tool and work
Maintaining an electrolyte between the work and tool in a very small gap between the two

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