有没有数模与测量精度没有关系。一般测自动圆或手动测量后自动运行一次结果都是一样的。

自动圆可以在端面上测量三个样例点，向量创建测量。在孔内至少要测量四个以上的点。因为超过三个点才能看到圆度偏差。如果这个偏差比较大，说明这个圆有点问题，或测量的不好或是这个孔圆度太差。

如果手动测量，最好在圆外面的端面上，测量一个平面，并指定这个平面为工作平面。

MODE/PROG,MAN
F(CIR1)=FEAT/CIRCLE,INNER,CART,31.5000,31.5000,-3.0000,0.0000,0.0000,1.0000, 20.0000
$$ Measurement points are created through nominal points
MEAS/CIRCLE, F(CIR1), 4

  PTMEAS/CART, 24.4289, 24.4289, -3.0000,  0.7071,  0.7071,  0.0000

  PTMEAS/CART, 24.4289, 38.5711, -3.0000,  0.7071, -0.7071,  0.0000

  PTMEAS/CART, 38.5711, 38.5711, -3.0000, -0.7071, -0.7071, -0.0000
  
  PTMEAS/CART, 38.5711, 24.4289, -3.0000, -0.7071,  0.7071,  0.0000

ENDMES
SNSET/APPRCH, 2.0000
SNSET/RETRCT, 2.0000
SNSET/DEPTH, 3
SNSET/SEARCH, 10.0000
SNSET/CLRSRF, 20.0000
F(CIR2)=FEAT/CIRCLE,INNER,CART,52.4500,11.5500,0.0000,0.0000,0.0000,1.0000, 6.7960
$$ Measurement points are created through nominal points
RMEAS/CIRCLE, F(CIR2), 4, VECBLD, 3.0000, 3
  GOTO/CART,   52.1596, 11.8222,  6.0000
  PTMEAS/CART, 49.9710, 13.8740, -3.0000,  0.7295, -0.6839, -0.0000
  PTMEAS/CART, 50.1260,  9.0710, -3.0000,  0.6839,  0.7295, -0.0000
  PTMEAS/CART, 54.9290,  9.2260, -3.0000, -0.7295,  0.6839, -0.0000
  PTMEAS/CART, 54.7740, 14.0290, -3.0000, -0.6839, -0.7295, -0.0000
ENDMES

RationalDMIS 2020 关于测量圆_python
RationalDMIS 2020 关于测量圆_数模_02