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运用半径增量法，建立了大型轴类零件同轴度误差的最小二乘法和最小条件法两种评定方法的实用数学模型。介绍了采用微机控制的大型轴类零件同轴度误差数据采集与数据处理系统的组成。在ＳＴＤ工业控制机的控制下，系统可自动实现测头调零、数据采集、数据处理、测量结果显示和（或）打印。运用该系统对工件进行了实际测量。实测结果表明：该系统安装调试方便，抗干扰能力强，测量速度和测量精度均较高。在车间条件下，既适用于加工中的大型轴类零件同轴度误差的在机测量，也适用于处于正常使用安装位置的大型轴类零件的在位测量。
By using the method of incremental radius, a practical mathematical model of two kinds of assessment methods of least square method and minimum condition method for the coaxial error of large shaft parts was established. This paper introduces the composition of data acquisition and data processing system for coaxial error of large shaft parts controlled by microcomputer. Under the control of STD industrial control machine, the system can automatically realize zero adjustment, data acquisition, data processing, measurement result display and / or printing. The system was used to actually measure the workpiece. The test results show that: the system is easy to install and debug, anti-interference ability, measurement speed and measurement accuracy are higher. Under the workshop conditions, it is suitable for the on-machine measurement of the coaxial error of large-scale shaft parts in processing as well as the in-position measurement of large shaft parts in the normal installation position.