分析了螺纹车削加工中，空刀导入量、空刀导出量的作用及其确定方法。
Analyse the function of the import & outport length of idle stroke in processing of screw cutting and the method to confirm the length.
常见的梯形螺纹车削，由于车削加工难度较大，操作技能要求较高，因而使初学者学习起来较困难。
It is very difficult for the beginners to master the common methods of processing echelon screw thread because of the high difficulty in the process and the high request to the operators.
介绍了米制梯形螺纹车削加工用户宏程序的编制和简单调用的方法，对提高数控机床的使用性能有很大的帮助，对其它非标螺纹的编程也具有一定的借鉴意义。
To improve the performance of NC machine tool, the paper introduces the method of custom macro programming technique and simple call on transfer process of the metric system ACME screw thread.
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