链轮分度圆计算

68.72316248 51.46756897 440.0053962 515.7722268 568.5183076 623.8391208 681.734501 742.2043129 805.2484441 870.8668009 939.0593046 1009.825888 121.2761691 1159.081074 1237.569586 1318.631992 1402.268261 1488.478365 1577.262279 1668.61998 1762.551451 1859.056673

1958.135631