Manufacturing And Production Technology
Trepanning is an operation of

Sizing and finishing a small diameter hole
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

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

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

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Manufacturing And Production Technology
Threading is an operation of

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

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

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

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