According to linearity error define,a kind of new tangent rotating and reducing method searching for the minimum circumscribed parallel lines is put forward, and its theoretical basis is given in this paper. For measured error curve, the methods and steps on precise solving its straightness error are presented.% 根据直线度误差定义,提出了一种新的寻找最小包容平行线的方法——相切旋转减小法,并给出了其理论依据;对于实测误差曲线,提出了精确求解直线度误差的方法和步骤
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