The main goal of the current study is to propose a model for determining the cutting forces taking into account the complex kinematics of the hobbing process. This model is based on one hand on the CAD geometrical simulations of undeformed chip generated by hobbing process and on the other hand on a mechanistic model. In this mechanistic approach, the specific force coefficients have been obtained from a 2D numerical model. As a result of this investigation, the evolution of cutting forces was used to analyze the effect of the cutting parameters on the machinability of the machined material.