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Why does a grinding wheel begin to act softer as it gets smaller?

April 26, 2017ACT grinding smaller softer wheel

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Why does a grinding wheel begin to act softer as it gets smaller?

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A grinding wheel will begin to lose surface footage speed as it loses size. For every 1,000 foot decrease in surface footage, the grinding wheel will act one grade softer. EXAMPLE: A 20 X 8 X 12 centerless grinding wheel specification of 55A60-LVH running @ 1241 RPM starts out running @ 6502 SFPM (.262 X 20 (Wheel Diameter) X 1241 (RPM). The same wheel worn to “17” diameter is now running @ 5527 SFPM and acting like a K grade (one grade softer).