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Table 1 Cutting parameters and their levels

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

Parameters Symbol Unit Levels
1 2 3
Cutting speed v m/min 100 160 220
Feed f mm/rev 0.05 0.09 0.13
Depth of cut d mm 0.2 0.4 0.6