The study’s primary aim is to determine whether using a CrN-coated WC tool for CNC green machining of unalloyed carbon MS (EN8) results in a better machining rate and surface finish than using an uncoated HSS tool. This study utilized a 20 mm in diameter by 50 mm in length EN8 steel rod. With the aid of a vacuum degassing furnace, the temperature ranges from normalizing to annealing for EN8 steel was 650 to 840 °C. Steel can be hardened by heating it to this temperature and then quenching it in oil or water. A CNC turning process was used to evaluate the surface finish of each bar in the trial group and the control group, which was made of unalloyed EN8 steel, and N = 16 + 16 = 32 test samples were taken from each group. The software G Power 3.1 is used to determine an 80% G power, and the overall specimen size for the Groups is 32. In this research, we determine the cutting parameters and response surface roughness values for all machined specimens using both the High-Speed Steel (HSS) tool and the Novel Chromium Nitride coated HSS tool. In the experimental investigation, the turning process is utilized to vary the speed, feed, and depth of cut to attain a Material Removal Rate (MRR) of 350 mm³/min. It is observed that the depth of cut significantly influences the cutting force and power, accounting for 62.31% and 60.72% of the respective variations. Also, the roughness is 19.04% on the surface. In Computer Numerical Control machining, the surface roughness can be decreased by using a WC tool with a novel Chromium Nitride coating rather than an HSS tool. Because these values are less than 0.05, they are considered significant by the T test, and the results are as follows: p = 0.001 MRR, and p = 0.020 for Ra. Within the scope of the investigations, the response of a novel chromium nitride was used to optimize the surface roughness and material removal rate of EN8 carbon steel. The results that were gathered showed that the Material removal rate is greatly influenced by the feed rate, spindle speed, and depth of cut. A material removal rate can be achieved by utilizing a feed rate of 0.4 mm per revolution and a depth of 0.2 mm during the turning operation.

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