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Which outcome occurs when exceeding the grinding wheel's Surface Feet per Minute (SFM) rating during precision bearing race grinding?

A)Thermal cracks on the race surface
B)Increased abrasive grain wear on wheel
C)Improved surface finish due to burnishing
D)Reduced stock removal rate, increased chatter

💡 Explanation

Exceeding recommended SFM causes excessive frictional heat because the increased speed overwhelms coolant effectiveness triggering thermal overload; therefore thermal cracks form on the race rather than improved finish because the excess heat compromises material integrity during grinding.

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