A novel compensation method of zero-adjustment error in flatness measurement using serial four-point method

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<p>The authors proposed a novel on-machine measurement method for evaluating three-dimensional profiles of machined flat surface: square layout four point (SLFP) method with angle compensation. The SLFP method enables to connect the results of straightness measurements of each scanning line by using additional two sensors and an angle sensor. Numerical simulation showed that the accumulation of zero adjustment error of displacement sensors makes unignorable distortion on the measurement results. Hence, a new calibration method for zero adjustment error was proposed and the validity of the method was confirmed by an experiment.</p>

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