等分圆周弦长系数K 弦长L=Kr（圆周半径）等分数34567101112系数K1.73211.41421.175610.86780.76540.6840.6180.56350.5176等分数13141516171819202122系数K0.47860.4450.41580.39020.36760.34730.32920.31920.2980.2845锉刀粗搓中搓细搓加工余量（毫米）0.5-10.2-0.50.05-0.2使用场合尺寸精度（毫米）0.2-0.50.04-0.2光洁度▽1～▽3▽4～▽5▽6等分数23242526272829303132系数K 0.27230.26110.25070.24110.23210.2240.21620.20910.20230.196
