The quality and productivity play very important role in manufacturing technology. The quality such as Surface roughness of any product influences the extent or degree of satisfaction. In this study CNC Lathe was used to perform turning operation and four type coated carbide insert used to use to perform experiment. This study applies Taguchi's design of experiment methodology and regression analysis for optimization of process parameters in turning aluminum alloy AA6063-T6 material using

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... carbide insert under dry environment condition and having four type insert nose radius such as 0.2, 0.4, 0.8, 1.2 mm. Experiment have been carried out based on L16 standard orthogonal array design with four process parameters namely cutting speed, feed rate, Depth of cut and nose radius for surface roughness. By considering smallerthebetter approach. Result of ANOVA to indicate that nose radius is the most significant process parameter for surface roughness .The mathematical models have been developed for individual's response using regression analysis.