Manufacturing And Production Technology
Jigs are used

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

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

Using abrasive slurry between the tool and work
Erosion caused by rapidly recurring spark discharges 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

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