螺纹导程，是螺纹上任意一点沿同一条螺旋线转一周所移动的轴向距离。
根据螺纹导程，电力控制，主轴旋转和进给运动都是同步的。
With the synchronous spindle the spindle rotation and the feed motion are synchronized by an electronic regulation according to the lead of thread.
通过对一种带有内螺纹的酒瓶盖的结构分析，阐述了采用大导程螺杆和螺母机构实现螺纹型芯自动旋转脱模的设计过程及其工作过程。
Through analyzing of a bottle cover structure with inner thread, a type of screw and nut with coarse pitch was applied to realize thread core demoulding automatically.
介绍了一种大导程波形联结螺纹的高效加工方法，借助计算机进行了螺纹牙形的精度分析，得出了齿形误差曲线。
This paper presents a high efficient process method of a steep lead tread of coupling screw and studies the profile accuracy by using electronic computer and arrives at the profile error curve.
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