《齿轮》1991年第4期刊登了吕云昭先生的《关于齿轮公法线的探讨》一文。以下简称《探讨》文。《探讨》文中述及测量公法线长时的测点偏离分圆较远一些,由于测点欠佳,会引起公法线长的测量误差。以及取与k°(按公式汁算的跨齿值)最接近的实际跨齿值k,测点最佳。这种 “Gear” No. 4 of 1991 published Lv Yunzhao’s “about the common law of gears” article. Hereinafter referred to as “discussion” article. “Discussion” mentioned in the article measuring the length of the public normal measuring point deviate from the circle a little further, due to poor measuring point, will lead to the measurement error of the length of the public law. And taking the actual cross-tooth value k closest to the k ° (cross-tooth value calculated by the formula), the measurement point is the best. This