(i) A hole is to be drilled in high-strength copper alloy workpiece with a 10 mm bit at a feed of
0.2 mm/rev. The spindle speed is 500 rpm. Estimate the material removal rate and the torque required for this operation. Take specific energy value of the work material as 1.9 w.s./mm3.
(ii) Discuss in brief the mechanism involved in grinding wheel wear. Why aluminium oxide and cubic boron nitride abrasives are suitable for grinding of steel, but silicon carbide or diamond are not?