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Meaning Of Grinding Process

We are having some skin defects during centerless grinding which machine having 6 heads and getting depth of grinding around.6 after process.In between from those 6 heads start 2 nos having rough cut and anoather 4 for finish.The skin defect type is the white round patch having 6mm width coming in rotational direction in full body.And we can feel those white patches with our bare hand.