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← TechnologyWhich 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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