This paper examines the mechanism initiating the damping capacity of a turning tool. The turning tool is considered as a beam on an elastic foundation. Parameters of the model are estimated from the experimental result of the free damped vibration frequency. Next, the magnitude of damping energy is calculated from the friction resistance and the relative slip between the tool shank and the tool post (elastic foundation) during vibration in both tangential and normal directions. The calculated result of damping energy agrees well with the experimental result of the damping capacity qualitatively, for various clamping loads and various surface topographies. This result indicates that the damping capacity of the turning tool system is mainly caused by the relative slip at the tool shank.

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