一、方法简介: 用极座标法测量平面凸轮和样板的曲线形状误差,是一项比较困难的工作,极座标测量法的关键,就是对被测件极心位置作正确校正。如果被测件极心与测量仪器的回转中心不重合,将会给测量结果带来误差。下面分别讨论极心偏移量对测量所得的极径值、极角值带来的误差: Method Introduction: It is a difficult task to measure the shape error of plane cam and sample with polar coordinate method. The key of polar coordinate measurement method is to correct the extreme position of the measured object. If the measured object and the center of rotation of the measuring instrument does not coincide, will bring errors to the measurement results. The following discussion of extreme deviations on the measurement of the polar diameter, polar angle error: