RationalDMIS 2020一平面与两偏置圆找正（原点不在偏置圆上）

本文主要是介绍RationalDMIS 2020一平面与两偏置圆找正（原点不在偏置圆上），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

如图所示，该零件的特点是两找正孔的连线与坐标轴线不平行，且为间接原点设置。
显然，按常规方法很难找正。

考虑到该类产品在实际测量中并不少见，所以，我们根据图样设计要求，选择了既方便操作又便于推广的最佳拟合坐标系的方法，应用效果非常满意。

具体操作步骤如下：

1.测平面，找正零件坐标系的第一轴；质心置零点

MODE/MAN
F(PLN1)=FEAT/PLANE,CART,9.3707,0.2201,0.0000,0.0000,0.0000,1.0000
$$ Measurement points are created through nominal points
MEAS/PLANE, F(PLN1), 4PTMEAS/CART, -41.1938, -27.1265, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART, -45.9434,  32.9734, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART,  59.4268,  29.2528, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART,  65.1934, -34.2194, 0.0000, 0.0000, 0.0000, 1.0000
ENDMES
D(CRD1) = DATSET/FA(PLN1), ZDIR
D(CRD1) = TRANS/ZORIG, FA(PLN1)

2.测圆1和圆2；

F(CIR1)=FEAT/CIRCLE,INNER,CART,-34.0000,25.0000,-3.0000,0.0000,0.0000,1.0000, 16.0000
$$ Measurement points are created through nominal points
MEAS/CIRCLE, F(CIR1), 4PTMEAS/CART, -34.1697, 32.9982, -3.0000,  0.0212, -0.9998, 0.0000PTMEAS/CART, -26.0136, 24.5343, -3.0000, -0.9983,  0.0582, 0.0000PTMEAS/CART, -33.4840, 17.0167, -3.0000, -0.0645,  0.9979, 0.0000PTMEAS/CART, -41.8287, 23.3533, -3.0000,  0.9786,  0.2058, 0.0000
ENDMES
F(CIR2)=FEAT/CIRCLE,INNER,CART,56.0000,-27.0000,-3.0000,0.0000,0.0000,1.0000, 16.0000
$$ Measurement points are created through nominal points
MEAS/CIRCLE, F(CIR2), 4PTMEAS/CART, 55.4230, -19.0208, -3.0000,  0.0721, -0.9974,  0.0000PTMEAS/CART, 63.8075, -25.2556, -3.0000, -0.9759, -0.2180, -0.0000PTMEAS/CART, 57.0712, -34.9280, -3.0000, -0.1339,  0.9910,  0.0000PTMEAS/CART, 48.0471, -27.8667, -3.0000,  0.9941,  0.1083,  0.0000
ENDMES

3.按图样对圆1和圆2进行（2D）理论坐标值的修改；

4.选圆1、圆2平移和旋转完成最佳拟合坐标系的创建过程。

$$/*  Header
DMISMN/'Created by [山涧果子] on 星期三, 七月 07, 2021', 4.0
UNITS/MM, ANGDEC, MMPS
WKPLAN/XYPLAN
PRCOMP/ON
TECOMP/ON
FLY/1.0000
MODE/MAN
SNSET/APPRCH, 2.0000
SNSET/RETRCT, 2.0000
SNSET/DEPTH, 0.0000
SNSET/SEARCH, 10.0000
SNSET/CLRSRF, 20.0000
RECALL/D(MCS)
SNSLCT/S(40-D2)
GEOALG/BF, LSTSQR
GEOALG/ANGLB, DEFALT
GEOALG/CIRCLE, LSTSQR
GEOALG/ARC, LSTSQR
GEOALG/PLANE, LSTSQR
$$
$$
$$*/
MODE/MAN
F(PLN1)=FEAT/PLANE,CART,9.3707,0.2201,0.0000,0.0000,0.0000,1.0000
$$ Measurement points are created through nominal points
MEAS/PLANE, F(PLN1), 4PTMEAS/CART, -41.1938, -27.1265, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART, -45.9434,  32.9734, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART,  59.4268,  29.2528, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART,  65.1934, -34.2194, 0.0000, 0.0000, 0.0000, 1.0000
ENDMES
D(CRD1) = DATSET/FA(PLN1), ZDIR
D(CRD1) = TRANS/ZORIG, FA(PLN1)
F(CIR1)=FEAT/CIRCLE,INNER,CART,-34.0000,25.0000,-3.0000,0.0000,0.0000,1.0000, 16.0000
$$ Measurement points are created through nominal points
MEAS/CIRCLE, F(CIR1), 4PTMEAS/CART, -34.1697, 32.9982, -3.0000,  0.0212, -0.9998, 0.0000PTMEAS/CART, -26.0136, 24.5343, -3.0000, -0.9983,  0.0582, 0.0000PTMEAS/CART, -33.4840, 17.0167, -3.0000, -0.0645,  0.9979, 0.0000PTMEAS/CART, -41.8287, 23.3533, -3.0000,  0.9786,  0.2058, 0.0000
ENDMES
F(CIR2)=FEAT/CIRCLE,INNER,CART,56.0000,-27.0000,-3.0000,0.0000,0.0000,1.0000, 16.0000
$$ Measurement points are created through nominal points
MEAS/CIRCLE, F(CIR2), 4PTMEAS/CART, 55.4230, -19.0208, -3.0000,  0.0721, -0.9974,  0.0000PTMEAS/CART, 63.8075, -25.2556, -3.0000, -0.9759, -0.2180, -0.0000PTMEAS/CART, 57.0712, -34.9280, -3.0000, -0.1339,  0.9910,  0.0000PTMEAS/CART, 48.0471, -27.8667, -3.0000,  0.9941,  0.1083,  0.0000
ENDMES
F(CIR1)=FEAT/CIRCLE,INNER,CART,-34.0000,25.0000,-3.0000,0.0000,0.0000,1.0000, 16.0000
F(CIR2)=FEAT/CIRCLE,INNER,CART,56.0000,-27.0000,-3.0000,0.0000,0.0000,1.0000, 16.0000
DMESW/COMAND,'D(CRD2) = LOCATE/XYDIR, ZAXIS, $FA(CIR1), XYZAXI, $FA(CIR2), XYZAXI'