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← TechnologyWhich outcome occurs when exceeding the grinding wheel's friability limit during CBN grinding of hardened steel?
A)Increased workpiece surface roughness✓
B)Reduced wheel wear and damage
C)Improved coolant flow and cooling
D)Decreased cycle time for grinding
💡 Explanation
Exceeding friability causes excessive grain fracture because the bond cannot retain abrasive particles against cutting forces, therefore increasing workpiece roughness rather than achieving a smooth finish due to constantly exposing new, coarse cutting edges.
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