This equation is useful in determining the kinematic linkage between the lathe spindle and the lead screw and enables proper selection of the gear train between them.

这公式在决定车床心轴和丝杆之间的运动学关系时很有用，并且提供了正确挑选它们之间轮系的方法。

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There is a certain of difficulties that the process of manufacture can not be observed easily and controlled safely when the big-lead screw in the CNC lathe.

在数控车床上加工大螺距螺杆有一定的技术难度，加工时不便观察且安全可控性差。

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