Manufacturing And Production Technology
The tool life in case of a grinding wheel is the time

Taken for a wear of 1 mm on its diameter
Between two successive regrinds of the wheel
Taken for the wheel to be balanced
Taken between two successive wheel dressings

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Manufacturing And Production Technology
Trepanning is an operation of

Producing a hole by removing metal along the circumference of a hollow cutting tool
Smoothing and squaring the surface around a hole
Sizing and finishing a small diameter hole
Making a cone-shaped enlargement of the end of a hole

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