The flatness errors of several different parts were sampled from a Coordinate Measuring Machine and then the harmonic characteristics of flatness errors were analyzed by observing the three-dimensional frequency spectrum obtained by calculating the data through Two-Dimensional Fast Fourier Transform. It was found through experiment and analysis that each harmonic component of a flatness error is generally similar if the processing system is reliable, i.e. the highest harmonic wavelength of a random error is infinite, and Nyquist Sampling Theorem can not be applied to directly verify flatness error sampling points.
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