Proposed least square method is found to be suitable for the harmonic analysis of spindle radial error data obtained in discrete time interval. Fourier transform method does not provide accurate values for the harmonic components of measurement data due to spectral leakage. The proposed method is suitable for analyzing short duration measurement data with incomplete number of spindle revolutions. The present algorithm requires no frequency domain conversion for the harmonic analysis of measurement data, consequently it can be used for online measurement and analysis of spindle error motions of miniaturized machine tool.
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