3.4. Cutting Force Component MeasurementThe effect of the cutting speed on the cutting force components when using the CC650 cuttingtool is presented in Figure 13. The radial force component was the largest component due to theincreased value of the tool nose radius (1.2 mm) when compared to the depth of cut (0.125 mm) [34]. All the components showed a steady behavior with no remarkable reduction in their values until cutting speed reached 700 m/min. By increasing the cutting speed to 1000 m/min, the radial and the tangential force components decreased by 20% and 12%, respectively, which can be attributed to the thermal softening effect. The reduction in the cutting force components and the chip compression ratio upon increasing the cutting speed to 1000 m/min, indicated the decrease of the coefficient of friction at the tool-chip interface when HSM is applied.