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

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

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Manufacturing And Production Technology
The facing is an operation of

Beveling the extreme end of a workpiece
Reducing the diameter of a workpiece over a very narrow surface
Machining the ends of a workpiece to produce a flat surface square with the axis
Embossing a diamond shaped pattern on the surface of a workpiece

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