In the straightness error detection, the current methods include knife mouth measurement, meter measurement, flat crystal measurement, level measurement, autocollimator measurement and mutual ratio method. These methods have high measurement accuracy and easy operation, and play an important role in improving product quality and promoting production. However, because they are limited by their own conditions, the application range has certain limitations, which is not conducive to online measurement. For example, the measured value of the knife edge measurement includes the straightness error of the knife edge, and it is not suitable for the straightness of large workpieces.
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