<p>This article presents a milling-based methodology for determining the fracture toughness, yield strength, and adhesion toughness of Inconel 718 under dynamic cutting conditions, based on an extension of Williams’ model. Unlike previous orthogonal cutting methods that require specialized setups, the proposed method employs a standard milling process, offering improved practicality and potential applicability in industrial environments. An analytical framework is developed by incorporating material fracture at the tool tip and adhesion at the tool-chip interface, in addition to plastic deformation and friction. The force-thickness relationship is extended to a three-dimensional oblique cutting configuration representative of milling. The normal shear angle is determined using a force minimization criterion, allowing the evaluation of cutting and transverse forces over a range of uncut chip thicknesses. Side milling experiments at different cutting speeds are conducted for validation. The measured cutting forces, combined with chip geometry, are used to extract the values of fracture toughness, yield strength, and adhesion toughness. The results exhibit consistent linear relationships, supporting the effectiveness of the proposed method. The main contribution of this work lies in the development of a practical and general methodology that extends force-based parameter identification to milling processes and enables the simultaneous evaluation of multiple mechanical parameters under realistic cutting conditions.</p>