The aim of this work is to develop a study of Taguchi optimization method for best surface roughness value in terms of cutting parameters when at the turning of aluminum alloy AA7475-T7351, Incoloy Alloy 800H and 15-5PH stainless steel material, face milling of Icolloy Alloy 800H and grinding of 15-5PH stainless steel and Incoloy alloy 800H, respectively. The machining parameters evaluated are cutting speed, depth of cut and feed rate, a series of cutting experiments are performed to measure the surface roughness data. The settings of cutting parameters were determined by using Taguchi experimental design method. Orthogonal arrays of Taguchi, the signal-to-noise (S/N) ratio, the analysis of variance (ANOVA) are employed to find the optimal levels and to analyze the effect of the cutting parameters on surface roughness. Confirmation tests with optimal levels of cutting parameters are carried out in order to illustrate the effectiveness of Taguchi optimization method. It is thus shown that the Taguchi method is very suitable to solve the surface quality problem occurring the turning, grinding and face milling of 6 type of material.