导程角也叫“螺纹升角”，在中径圆柱或中径圆锥上，螺旋线的切线与垂直于螺纹轴线的平面的夹角。在蜗轮蜗杆传动中，蜗杆导程角是蜗杆分度圆柱上螺旋线的切线与蜗杆端面之间的夹角。
... angle of lead 导程角 ... bear leader 富家子弟的私人教师或伴游者；牵链子者 ... black lead 石墨 ...
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从理论上证明了改变导程角是控制物料旋留时间的最有效的方法。
It is proved theoretically that changing lead Angle is the best way to control the turn staying time of material.
从理论上证明了改变导程角是控制物料旋留时间的最有效的方法。
It is proved theoretically that changing lead Angle is the best way to control the turn staying time of material. Hence the theoretical basis for production practice has...
介绍了由单片机控制的可控硅电路，该电路运用外部中断获得同步信号，用定时器做导通角控制，并给出实用程。
The controllable silicon circuit controlled by monolithic microcomputer is introduced, which adopts external interrupt to obtain sync signals and controls conducting angel with a timer.
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