and validated against established theoretical models. The Johnson–Cook constitutive model was applied to describe the material behavior under high strain rates and elevated temperatures, while process optimization was performed using the Taguchi design of experiments (DOE) in Minitab 17. The results demonstrate that cutting speed, feed rate, and depth of cut significantly affect cutting forces in all three directions (Fx, Fy, Fz). Specifically, increasing cutting speed reduces cutting forces, whereas higher feed rates and depths of cut increase them. Furthermore, tool geometry—particularly tool nose radius—was found to influence tangential and radial forces while reducing axial forces. The proposed numerical model shows strong agreement with published experimental data, confirming the accuracy of FEM in predicting cutting forces during the machining of Inconel 718. These findings provide valuable insights for optimizing turning parameters, improving tool life, and ensuring machining efficiency in the processing of difficult-to-cut super alloys.