Manufacturing And Production Technology
The tool life is said to be over if

Poor surface finish is obtained
All of these
Overheating and fuming due to heat of friction starts
There is sudden increase in cutting forces and power consumption

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Manufacturing And Production Technology
The snag grinding is done

To grind exterior cylindrical surfaces
Any one of the above
To produce good surface finish and high degree of accuracy
To remove considerable amount of metal without regard to accuracy of the finished surface

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