_ The tool life in case of a grinding wheel is the time$?

1.	_ The tool life in case of a grinding wheel is the time$?
A.	Between two successive regrinds of the wheel
B.	Taken for the wheel to be balanced
C.	Taken between two successive wheel dressings
D.	Taken for a wear of 1 mm on its diameter
Answer» D. Taken for a wear of 1 mm on its diameter

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_ The tool life in case of a grinding wheel is the time$?

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