Manufacturing And Production Technology
The tool may fail due to

Plastic deformation of the cutting edge
All of these
Cracking at the cutting edge due to thermal stresses
Chipping of the cutting edge

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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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