Surface finish is a vital thing during any machining processes; hence it is very essential to control the required surface quality to have a better choice of optimized cutting parameter. The main intension is to optimize the cutting parameter. Generally hard turningis turning process in which work material whose hardness about 46-69 HRC are used. Thus, various sort of tipped tools are used for turning operation. The orthogonal array, signal to noise ratio are employed to study the performance characteristics in turning operation. To study the performance characteristics, three process parameter are mainly briefed viz speed, feed and depth of cut. Experiments have been conducted using L9 orthogonal array under Dry turning tests which was carried out on hardened EN24 (46 HRC) with coated carbide cutting insert on CNC machine. The main aim is not only to increase machine utilization but also to decrease production cost and achieve best surface finishing. From experimental results, it predicts that the feed is highly influential for good quality of a surface.