这篇文章提出了公法线长度并推导出超前角的计算公式。
In this paper base tangent length is put forward and lead angle calculating formula is deduced.
此误差可通过在公法线长度方向上加大留磨量，进行磨齿予以消除。
The error can be avoided by increasing the gear grinding allowance in length of common normal line to grind gear.
经过严密计算和实践反复验证，用公法线长度测绘法确定齿轮模数可满足要求。
After iterative and rigorous practice, it turned out that it can meet the demand when using length of common normal to measure gears modulus.
介绍了齿轮精度检测和齿轮参数测绘中用公法线长度测量的基本原理和基本方法。
Introduces the rationale and techniques of common normal length measurement in the test and mapping of parameters for gears.
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。
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。
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.
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