刀尖半径与进给量、表面粗糙度的关系

车削时，刀尖半径与进给量、表面粗糙度的理论值存在一定关系，我们选择进给量时一般不应超过此值。

h=r_e-(r_e²-(0.5×f)²)^0.5
h为残留高度，而：

Ra=(0.25~0.33)h

因此:
f_max=(R_a×r_e/50)^½
刀尖圆角
mm圆刀片
mm
Ra/Rz µm0.4/1.61.6/6.33.2/12.56.3/258/3232/100进给量 mm0.2 0.050.080.13   0.4 0.070.110.170.22  0.8 0.100.150.240.300.38 1.2  0.190.290.370.47 1.6   0.340.430.541.082.4   0.420.530.661.32 60.200.310.490.62   80.300.360.560.72   100.250.400.630.801.00  12 0.440.690.881.10  16 0.510.801.011.262.54 20  0.891.131.422.94 25   1.261.583.33