In this paper calculating method of lead angle of helical gear by measuring span length of length bar and base tangent length is put forward and lead angle calculating formula is deducel.
分析齿轮主要参数，提出用测量跨棒（）和公法线长度计算斜齿圆柱齿轮螺旋角的测绘方法，并推导出螺旋角的计算公式。
This paper analyses parabola precision of a cableway of single span, and discusses rise Angle while the load is in motion and puts new method of algorithm for rise Angle.
分析了单跨索道的抛物线算法，讨论了荷重运行时的升角，并提出了新的升角计算方法。
This paper analyses parabola precision of a cableway of single span, discusses rise angle of overshead travelling crane while the load is in motion and puts new method of algorithm for rise angle.
分析了单跨索道的抛物线算法 ，讨论了荷重运行时的升角 ，并提出了新的升角计算方法 。
This paper analyses parabola precision of a cableway of single span, discusses rise angle of overshead travelling crane while the load is in motion and puts new method of algorithm for rise angle.
分析了单跨索道的抛物线算法 ，讨论了荷重运行时的升角 ，并提出了新的升角计算方法 。
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