In this paper, were determined the effects of cutting tool coating material and cutting speed on cutting forces and surface roughness based on Taguchi experimental design method. Main cutting force, Fz is considered to be cutting force as a criterion. In the experiments, depending on the tool coating material, lowest main cutting force is found to be 548 N with KC9240 CVD coated cemented carbide and Lowest average surface roughness (0.812 μm) with KT313 uncoated cemented carbide insert both at 100 m/min. The effects of machining parameters were investigated using Taguchi L18 orthogonal array. Optimal cutting conditions were determined using the signal-to-noise (S/N) ratio which is calculated for average surface roughness and cutting force according to the "the smaller is better" approach. Using results of analysis of variance (ANOVA) and signal-to–noise (S/N) ratio, effects of parameters on both average surface roughness and cutting forces were statistically investigated. It has seen that while cutting speed and cutting tool has higher effect on the cutting force, the cutting tool and cutting speed has higher effect on average surface roughness. The results obtained indicated that CVD cutting tools performed better than PVD and uncoated cutting tools according to cutting forces, but in terms of surface quality was observed poor performance with KC 9240 and KT315 by current parameters.Keywords: Machinability, Optimized by Taguchi design of experiments, Inconel 625, Surface roughness, Cutting force
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