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(a-c) SEM Images of worn out drill at (a) N = 1250 (rpm), f = 0.05 (mm/rev), P = 500* 103 (Pa), NP = 1.5% (g): (VB-42 µm), (b) N = 1000 (rpm), f = 0.125 (mm/rev), P = 750* 103 (Pa), NP = 1.5% (g): (VB-59 µm) and (c) EDS analysis of worn out drill at N = 1250 (rpm), f = 0.125 (mm/rev), P = 2500* 103 (Pa), NP = 1% (g): (VB-69 (µm).
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