The cutting force acting in the dynamic state of a lathe spindle-workpiece system is affected by the dynamic variations of cutting depth, cutting velocity, and rake angle. In this study, the influences of these parameters on the dynamic cutting force are measured by unique experiments. The phase lag between the dynamic cutting force and vibration displacement is clarified under various cutting conditions. The dynamic cutting force when the cutting velocity and the rake angle are dynamically changed is measured, and the results are represented as the cutting velocity coefficients and the rake angle coefficients. Based on these results, the energy supplied by the dynamic cutting force is obtained and the mechanism by which the chatter vibration occurs is discussed.

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