There is a direct relationship between the cutting conditions and the economics of the SSM-process. The goal is to cut the part as quickly as possible while maintaining safe cutting conditions and high part quality. The simulation of the physical process must be capable of estimating the cutting forces. The cutting force information may be used to verify that: (1) the cutter teeth will not break, (2) the spindle motor power is sufficient, (3) the bending stresses in the shank will not cause the tool to break and (4) the tool deflection will not cause the part to deviate from the required tolerance.