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← TechnologyWhich outcome occurs when a grinding wheel's rotational speed excessively increases during CNC machining?
A)Increased workpiece surface roughness✓
B)Reduced part thermal expansion
C)Improved grinding fluid dispersion
D)Decreased spindle motor efficiency
💡 Explanation
Increased grinding wheel speed causes excessive abrasive grain engagement, promoting a **plowing effect** rather than chip formation, because material removal becomes uncontrolled; therefore, increased surface roughness is the outcome, rather than improved finish at lower speeds.
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