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三坐标测量机(简称CMM),在测量工件时,所产生的误差可分为两大类:系统误差和随机误差。系统误差都是有规律的,可根据厂方提供的数据进行修正。而影响CMM综合精度(即点位精度)的随机误差,由于来源多,没有规律。诸如:导轨的直线度和垂直度在运动过程中引起的局部误差,测量力的变化引起的误差,测头的重复性误差,工件和不同重量引起的工作台面的变形,周围环境温度的波动,地基的振动,湿度的间接影响等,都会引起随机误差,因此,有必要对其进行计
CMM (CMM), in the measurement of the workpiece, the resulting error can be divided into two categories: systematic error and random error. System errors are regular, according to the data provided by the factory to be amended. However, the random errors that affect the overall accuracy of the CMM (that is, the precision of the point) are irregular due to many sources. Such as: rail straightness and verticality caused by the local error in the movement, the measurement error caused by changes in force, the error of the probe repeatability, workpiece and different weight caused by the deformation of the work surface, ambient temperature fluctuations, The vibration of the foundation and the indirect influence of the humidity will cause random errors, so it is necessary to carry out the calculation