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Table 7 Machining cost per part for coated carbide insert in hard turning

From: Experimental investigation of surface roughness, flank wear, chip morphology and cost estimation during machining of hardened AISI 4340 steel with coated carbide insert

No. Costs Coated carbide
1 Value of machine & operator, $3.2 per hour (x) $0.05/min
2 Machining cost per part (xTc) $0.059
3 Tool changing cost per part [xTd (Tc/T)] $0.0076
4 Tool insert cost per piece $8
5 Mean value of single cutting edge (y) $2
6 Total cost per part [y (Tc/T)] $0.06
7 Total machining cost per part (C), (2 + 3 + 6) $0.13
  1. Cutting conditions: cutting speed (v) = 220 m/min, feed (f) = 0.087 mm/rev, depth of cut (d) = 0.52 mm, machining length (L) = 100 mm, finished w/p diameter (D) = 72 mm, workpiece = AISI 4340 (49 HRC), flank wear (VB) = 0.3 mm, surface roughness (Ra) = 1.6 μm, machining time per part (Tc)= \( \frac{\uppi \mathrm{DL}}{1000\mathrm{vf}} \) = 1.18 min, machine downtime (Td) = 5 min, tool life for single edge (T) = 39 min