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.
本文导出了法向弦长和公法线千分尺安置角的精确计算公式。
The exact computing formulas for the normal chord length and the set angle of the gear tooth micrometer callipers have been derived here.
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