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← TechnologyWhich risk increases when exceeding the wheel speed limit during high-precision grinding of a hardened steel bearing race?
A)Grain fracture and thermal damage✓
B)Increased coolant contamination levels
C)Reduced spindle motor efficiency
D)Greater aerodynamic drag on wheel
💡 Explanation
Exceeding wheel speed raises heat at the contact that causes grain fracture and workpiece thermal damage and burning because of increased friction; therefore, thermal integrity issues develop, rather than coolant issues, spindle load, or external aerodynamics, which have far less direct bearing.
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