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。
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.
必须将心轴锚定在中心点和驱动板之间的位置，并且必须使用车床轧头。
The mandrel must be mounted between centers and a drive plate and lathe dog must be used.
确保车床轧头牢牢地固定在心轴端的机械平面上，而不是锚定在锥形心轴的平滑面上(图7 -44)。
Ensure that the lathe dog is secured to the machined flat on the end of the mandrel and not on the smooth surface of the mandrel taper (Figure 7-44).
一个工作以前，车床、车床中心是对齐的，这就意味着两个中心轴必须在一条线上。
Before turning a work in the lathe, the lathe centers are to be aligned; that means that the axes of both centers must be on one line.
一个工作以前，车床、车床中心是对齐的，这就意味着两个中心轴必须在一条线上。
Before turning a work in the lathe, the lathe centers are to be aligned; that means that the axes of both centers must be on one line.
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