RationalDMIS 2020 一平面与两偏置圆找正（原点在一偏置圆上）

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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。质心置零点。

MODE/MAN
F(PLN1)=FEAT/PLANE,CART,39.2151,18.2756,0.0000,0.0000,0.0000,1.0000
$$ Measurement points are created through nominal points
MEAS/PLANE, F(PLN1), 4PTMEAS/CART, -14.7962,  47.7215, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART, -14.3550, -13.9761, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART,  92.5419, -10.8091, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART,  93.4697,  50.1661, 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，圆心置原点；

D(CRD2) = TRANS/XORIG, FA(CIR1), YORIG, FA(CIR1)

3.测圆2并按图样进行（2D）理论坐标值修改；

F(CIR2)=FEAT/CIRCLE,INNER,CART,80.0000,40.0000,-3.0000,0.0000,0.0000,1.0000, 16.0000
$$ Measurement points are created through nominal points
MEAS/CIRCLE, F(CIR2), 4PTMEAS/CART, 80.0046, 48.0000, -3.0000, -0.0006, -1.0000, -0.0000PTMEAS/CART, 87.9347, 41.0200, -3.0000, -0.9918, -0.1275, -0.0000PTMEAS/CART, 79.5785, 32.0111, -3.0000,  0.0527,  0.9986,  0.0000PTMEAS/CART, 72.0913, 38.7950, -3.0000,  0.9886,  0.1506,  0.0000
ENDMES
F(CIR2)=FEAT/CIRCLE,INNER,CART,80.0000,40.0000,-3.0000,0.0000,0.0000,1.0000, 16.0000

4.选圆1、圆2仅旋转完成最佳拟合坐标系的创建过程。

DMESW/COMAND,'D(CRD3) = LOCATE/NOTRAN, ZAXIS, $FA(CIR1), XYZAXI, $FA(CIR2), XYZAXI'

$$/*  Header
DMISMN/'Created by [山涧果子] on 星期三, 七月 07, 2021', 4.0
UNITS/MM, ANGDEC, MMPS
WKPLAN/XYPLAN
PRCOMP/ON
TECOMP/ON
FLY/1.0000
MODE/MAN
SNSET/APPRCH, 2.0000
SNSET/RETRCT, 2.0000
SNSET/DEPTH, 0.0000
SNSET/SEARCH, 10.0000
SNSET/CLRSRF, 20.0000
RECALL/D(MCS)
SNSLCT/S(40-D2)
GEOALG/BF, LSTSQR
GEOALG/ANGLB, DEFALT
GEOALG/CIRCLE, LSTSQR
GEOALG/ARC, LSTSQR
GEOALG/PLANE, LSTSQR
$$
$$
$$*/
MODE/MAN
F(PLN1)=FEAT/PLANE,CART,39.2151,18.2756,0.0000,0.0000,0.0000,1.0000
$$ Measurement points are created through nominal points
MEAS/PLANE, F(PLN1), 4PTMEAS/CART, -14.7962,  47.7215, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART, -14.3550, -13.9761, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART,  92.5419, -10.8091, 0.0000, 0.0000, 0.0000, 1.0000PTMEAS/CART,  93.4697,  50.1661, 0.0000, 0.0000, 0.0000, 1.0000
ENDMES
D(CRD1) = DATSET/FA(PLN1), ZDIR
D(CRD1) = TRANS/ZORIG, FA(PLN1)
F(CIR1)=FEAT/CIRCLE,INNER,CART,0.0000,0.0000,-3.0000,0.0000,0.0000,1.0000, 16.0000
$$ Measurement points are created through nominal points
MEAS/CIRCLE, F(CIR1), 4PTMEAS/CART, -0.5111,  7.9837, -3.0000,  0.0639, -0.9980,  0.0000PTMEAS/CART,  7.9705,  0.6868, -3.0000, -0.9963, -0.0859, -0.0000PTMEAS/CART,  1.3411, -7.8868, -3.0000, -0.1676,  0.9859,  0.0000PTMEAS/CART, -7.4904, -2.8096, -3.0000,  0.9363,  0.3512,  0.0000
ENDMES
D(CRD2) = TRANS/XORIG, FA(CIR1), YORIG, FA(CIR1)
F(CIR2)=FEAT/CIRCLE,INNER,CART,80.0000,40.0000,-3.0000,0.0000,0.0000,1.0000, 16.0000
$$ Measurement points are created through nominal points
MEAS/CIRCLE, F(CIR2), 4PTMEAS/CART, 80.0046, 48.0000, -3.0000, -0.0006, -1.0000, -0.0000PTMEAS/CART, 87.9347, 41.0200, -3.0000, -0.9918, -0.1275, -0.0000PTMEAS/CART, 79.5785, 32.0111, -3.0000,  0.0527,  0.9986,  0.0000PTMEAS/CART, 72.0913, 38.7950, -3.0000,  0.9886,  0.1506,  0.0000
ENDMES
F(CIR2)=FEAT/CIRCLE,INNER,CART,80.0000,40.0000,-3.0000,0.0000,0.0000,1.0000, 16.0000
DMESW/COMAND,'D(CRD3) = LOCATE/NOTRAN, ZAXIS, $FA(CIR1), XYZAXI, $FA(CIR2), XYZAXI'