直齿锥齿轮的各部尺寸计算均以大端为基础,并按其当量齿数进行计算,而弦齿高h_x从何处算起往往被忽视。用齿厚游标卡尺测量齿厚时,其弦齿高h_x通常是从理论外圆算起。若理论外圆的当量圆半径设计与锥齿轮当量顶圆半径相等时,从理论外圆起始计算h_x,测出其弦齿厚是正确的。否则,测出的齿厚就不是图纸所要求的。 Straight bevel gear minisize size calculations are based on the big end, according to the equivalent number of teeth to calculate, and where the chord height h_x often overlooked. With tooth thickness caliper measurement tooth thickness, the chord height h_x is usually calculated from the theoretical outer circle. If the theoretical circle equivalent circle radius design and bevel gear equal to the top circle radius equal to calculate h_x from the theoretical outer circle start, measured the tooth thickness is correct. Otherwise, the tooth thickness measured is not required by the drawing.