对于一台机床来说,其几何误差是恒定的重复误差,并在加工中传递给工件。在全几何误差中,要算把旋转运动传递给刀具或工件的主轴回转精度对加工精度的影响最为显著。通常认为主轴的回转精度就是主轴前端的径向跳动和端百跳动。但它们与加工精度并无直接的关系。为了使主轴运转精度的试验能直接反映加工精度,必须改变某些定义及相应的试验方法。在本文及以后的续篇中,介绍了有关主铀运转精度的现代术语及定 For a machine, its geometric error is a constant repetitive error, and delivered to the workpiece in the process. In the full geometric error, to be considered as the rotary motion transmitted to the tool or workpiece spindle rotation accuracy of the processing accuracy of the most significant impact. Generally believed that the spindle rotation accuracy is the front-end of the spindle radial run-up and end hundred beating. But they are not directly related to machining accuracy. In order to test the accuracy of spindle operation can directly reflect the machining accuracy, some definitions and the corresponding test methods must be changed. In this and subsequent articles, the modern terminology and precision of the main uranium operating accuracy is introduced