In this paper base tangent length is put forward and lead angle calculating formula is deduced.

这篇文章提出了公法线长度并推导出超前角的计算公式。

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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。

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