An endrill is clamped by a side-locking device. The shape of a hole obtained by such a drill is found to be of a distorted oval shape. Fourier analysis of the process reveals that the out-of-roundness of the hole is due to the harmonic variation of the centrifugal force developed on the drill-bit. The chattering ranges of the spindle speed are also shown in a stability chart representing the frequency response of the system.

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