Manufacturing And Production Technology
The hardness of a grinding wheel is determined by the

Ability of the bond to retain abrasives
Ability of the grinding wheel to penetrate the work piece
Hardness of abrasive grains
Hardness of the bond

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

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
Using abrasive slurry between the tool and work

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