分度圆直径 meaning in English

reference diameter
standard pitch diameter

What is noticeable is : to bevel gear , the corresponding teeth shape is bigger to the modulus and reference circle in formula 1 and 2
值得注意的是对于斜轮而言，公式1和2中的模数和分度圆直径所对应的形更大。
Max , please select another material or another reference diameter and gear thickness , calculating again according to the new material correction coefficient
，选另外一种材料或另一分度圆直径和厚，按照新的材料修正系数重新计算。