This paper attempts on optimizing the turning process under various machining parameters by Taguchi method to develop or implement the quality of a machined product. Taguchi optimization methodology is applied to optimize cutting parameters in turning mild steel with coated cemented carbide tool under dry cutting condition. The CNC turning machine is used to conduct experiments based on the Taguchi design of experiments (DOE) with an orthogonal L9 array. The orthogonal array, signal to noise ratio (S/N) and analysis of variance were employed to find the maximum material removal rate (MRR) and minimum surface roughness.