The base plane transformation is the processing of the error measurement data when the flatness is evaluated. The principle of the base surface transformation is to properly translate or rotate the reference plane so that the position of the measured surface of the measured surface relative to the transformed reference plane meets the small amount condition, and the flatness error value conforming to the principle of minimum condition is obtained. The rotation of the base surface is the means to make the base surface meet the minimum condition, and the purpose of the base surface translation is to obtain
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