RationalDMIS 7.1 一平面与两偏置圆找正（原点在一偏置圆上）

如图所示，该零件的第1轴是通过测量-一个平面来找正的，面质心点置原点；第2轴由于两圆连线不平行于坐标轴，所以，从传统的概念上，不少用户都是通过图样给定的两孔理论坐标值，计算出一个理论坐标轴的旋转角度，来完成坐标系找正的。事实上这种方法不仅麻烦，找正的效果也有一定的局限性。

*具体操作步骤如下：

1.测平面1，找正零件坐标系的第一轴；
2.测圆1，圆心置原点；
3.测圆2并按图样进行（2D）理论坐标值修改；
4.选圆1、圆2仅旋转完成最佳拟合坐标系的创建过程。

$$/*  Header
DMISMN/'Created by [爱科腾瑞科技(北京)有限公司-091520-DEMO-11023(力合)] on 星期五, 八月 07, 2020', 4.0
UNITS/MM, ANGDEC, MMPS
WKPLAN/XYPLAN
PRCOMP/ON
TECOMP/ON
FLY/1.0000
MODE/MAN
SNSET/APPRCH, 2.0000
SNSET/RETRCT, 2.0000
SNSET/DEPTH, 0.0000
SNSET/SEARCH, 10.0000
SNSET/CLRSRF, 15.0000
RECALL/D(MCS)
SNSLCT/S(D2L20)
GEOALG/BF, LSTSQR
GEOALG/ANGLB, DEFALT
GEOALG/CIRCLE, LSTSQR
GEOALG/ARC, LSTSQR
GEOALG/PLANE, LSTSQR
$$
$$
$$*/
MODE/MAN
F(PLN1)=FEAT/PLANE,CART,27.9913,17.3428,0.0000,0.0000,0.0000,1.0000
$$ Measurement points are created through nominal points
MEAS/PLANE, F(PLN1), 4PTMEAS/CART, -22.0893,  45.1473, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART, -21.6129,  -9.6797, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART,  76.9777, -10.8235, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART,  78.6897,  44.7272, 0.0000, 0.0000, 0.0000, 1.0000
ENDMES
D(CRD1) = DATSET/FA(PLN1), ZDIR
D(CRD1) = TRANS/ZORIG, FA(PLN1)
F(CIR1)=FEAT/CIRCLE,INNER,CART,0.0000,0.0000,-3.8191,0.0000,0.0000,1.0000, 10.0000
$$ Measurement points are created through nominal points
MEAS/CIRCLE, F(CIR1), 4PTMEAS/CART, -2.6178, 4.2600, -3.3082,  0.5236, -0.8520,  0.0000PTMEAS/CART, -0.1973, 4.9961, -3.7391,  0.0395, -0.9992,  0.0000PTMEAS/CART,  3.5078, 3.5630, -3.7956, -0.7016, -0.7126, -0.0000PTMEAS/CART,  3.9301, 3.0910, -4.4334, -0.7860, -0.6182, -0.0000
ENDMES
D(CRD2) = TRANS/XORIG, FA(CIR1), YORIG, FA(CIR1)
F(CIR2)=FEAT/CIRCLE,INNER,CART,60.0000,40.0000,-4.1397,0.0000,0.0000,1.0000, 10.0000
$$ Measurement points are created through nominal points
MEAS/CIRCLE, F(CIR2), 4PTMEAS/CART, 58.3412, 44.7168, -3.5537,  0.3318, -0.9434,  0.0000PTMEAS/CART, 61.7718, 44.6755, -3.7697, -0.3544, -0.9351, -0.0000PTMEAS/CART, 63.2514, 43.7984, -4.7164, -0.6503, -0.7597, -0.0000PTMEAS/CART, 64.0240, 42.9678, -4.5191, -0.8048, -0.5936, -0.0000
ENDMES
F(CIR2)=FEAT/CIRCLE,INNER,CART,60.0000,40.0000,-4.1397,0.0000,0.0000,1.0000, 10.0000
DMESW/COMAND,'D(CRD3) = LOCATE/NOTRAN, ZAXIS, $FA(CIR1), XYZAXI, $FA(CIR2), XYZAXI'