在选用标准或非标准内齿插齿刀时都要验算以下几项: (a)插齿刀对齿轮顶切; (b)插齿过程发生切入顶切; (c)有效渐开线终点的曲率半径是否大于要求的曲率半径; (d)齿轮齿根圆的尺寸是否符合要求。 In the selection of standard or non-standard internal thread shaper cutter must check the following items: (a) gear shaper cutter on the top cut; (b) insert cutter process cut into the top cut; (c) the effective involute end Whether the radius of curvature is greater than the required radius of curvature; (d) Whether the gear root circle size meets the requirements.