Metal cutting industries are confronted with the task of increasing production rate while lowering costs and improving final product quality. Manufacturing companies are under great pressure to discover and develop new technologies in order to fulfil increasing demands for productivity, closed tolerance, dimensional stability, and cost. As a result, coating an existing tool can help you enhance production rates, extend tool life, and save money. The purpose of this study is to optimize machining parameters including feed rate, depth of cut, and spindle speed when turning AISI316L using three coated tool inserts with different coatings. Using design expert software and response surface methodology (RSM), parameters in the direction of surface roughness are optimized. The condition of surface roughness was discovered to be ideal. For each solution, second-order polynomial models developed in this study were employed to attain the given ideal conditions. Derringer's desirability function technique was used to optimize several responses. The best surface roughness values found with CNMG 120404 coated with TiN (Titanium nitride), CNMG 120408 coated with TiAIN(Titanium aluminium nitride), and CNMG 120412 coated with AlCrN (Aluminum Chromium Nitride) are 1.311 m, 0.897 m, and 0.965 m, respectively. To validate the model, triplicate tests were performed under ideal conditions, and the mean values of the experimental data were compared to the expected values.