RationalDMIS 两点偏移列队坐标系RationalDMIS 7.0一平面与两偏置圆找正（一面两孔坐标系） 在批量加工箱体、杠杆、盖板类零件时，大多是以工件上一个平面和两定位孔作为定位基准实现组合定位，简称‘一面两孔(一面两销)’定位。 采用‘一面两孔’定位，能使工件在各道工序上的定位基准统一，进而可减少因定位基准多次变换而产生的定位误差，提高工件的加工精度。另外，还可减少夹具结构多样性，便于其设计和制造。上图指明了面基准所在的位置，标注了两孔位置，其中一个孔只标注了一个轴，属于‘完全定位’。 RationalDMIS 7.1的‘两点偏移队列坐标系机构’可实现‘一面两孔’ 建坐标系功能。（1）测量立方体前表面，找正第一轴。（2）测量直径15MM孔和直径20MM孔（3）XY原点平移到直径15MM孔（4）两点偏移坐标系 偏移工作平面：指定两孔所在的坐标平面两点偏移元素设置完全定位情况如下图，CIR2只限制Z方向，并且位于CIR1的X轴+方向，所以设置如下图：点击预览，观察坐标系的位置是否正确，再点击添加/激活坐标系.（5）检查坐标系 打开圆属性页，观察XY实际值是否与图纸标注的一致。$$/* HeaderDMISMN/'Created by [爱科腾瑞科技(北京)有限公司-091520-DEMO] on Monday, April 20, 2020', 4.0UNITS/MM, ANGDEC, MMPSWKPLAN/XYPLANPRCOMP/ONTECOMP/ONFLY/1.0000MODE/MANSNSET/APPRCH, 2.0000SNSET/RETRCT, 2.0000SNSET/DEPTH, 0.0000SNSET/SEARCH, 10.0000SNSET/CLRSRF, 50.0000RECALL/D(MCS)SNSLCT/S(L20-D2.0_A90_B90)GEOALG/BF, LSTSQRGEOALG/ANGLB, DEFALTGEOALG/CIRCLE, LSTSQRGEOALG/ARC, LSTSQRGEOALG/PLANE, LSTSQR$$$$$$*/MODE/MANF(PLN1)=FEAT/PLANE,CART,28.9345,0.0000,11.8032,-0.0000,-1.0000,0.0000$$ Measurement points are created through actual pointsMEAS/PLANE, F(PLN1), 4 PTMEAS/CART, -4.9627, -0.0000, 28.7946, -0.0000, -1.0000, 0.0000 PTMEAS/CART, -13.5029, -0.0000, -11.9052, -0.0000, -1.0000, 0.0000 PTMEAS/CART, 64.3956, -0.0000, -10.4777, -0.0000, -1.0000, 0.0000 PTMEAS/CART, 69.8081, -0.0000, 40.8008, -0.0000, -1.0000, 0.0000ENDMESD(CRD1) = DATSET/FA(PLN1), -YDIRD(CRD1) = TRANS/YORIG, FA(PLN1)F(CIR1)=FEAT/CIRCLE,INNER,CART,-0.0000,2.5920,-0.0000,-0.0000,-1.0000,0.0000, 15.0000$$ Measurement points are created through actual pointsMEAS/CIRCLE, F(CIR1), 4 PTMEAS/CART, -2.5860, 2.5919, 7.0401, 0.3448, -0.0000, -0.9387 PTMEAS/CART, 7.4562, 2.5919, 0.8095, -0.9942, 0.0000, -0.1079 PTMEAS/CART, 0.1782, 2.5919, -7.4979, -0.0238, -0.0000, 0.9997 PTMEAS/CART, -6.7172, 2.5919, -3.3361, 0.8956, -0.0000, 0.4448ENDMESF(CIR2)=FEAT/CIRCLE,INNER,CART,50.0000,2.0909,-2.0000,-0.0000,-1.0000,0.0000, 20.0000$$ Measurement points are created through actual pointsMEAS/CIRCLE, F(CIR2), 4 PTMEAS/CART, 48.2299, 2.0908, 7.8421, 0.1770, -0.0000, -0.9842 PTMEAS/CART, 59.9899, 2.0908, -2.4500, -0.9990, 0.0000, 0.0450 PTMEAS/CART, 49.0320, 2.0908, -11.9530, 0.0968, -0.0000, 0.9953 PTMEAS/CART, 40.3746, 2.0908, -4.7116, 0.9625, -0.0000, 0.2712ENDMESD(CRD2) = TRANS/XORIG, FA(CIR1), ZORIG, FA(CIR1)F(CIR1)=FEAT/CIRCLE,INNER,CART,-0.0000,2.5919,0.0000,-0.0000,-1.0000,-0.0000, 15.0000F(CIR2)=FEAT/CIRCLE,INNER,CART,50.0000,2.0908,-2.0000,-0.0000,-1.0000,-0.0000, 20.0000D(CRD3) = LOCATE/ZDIR, YAXIS, FA(CIR1), FA(CIR2)来源：山涧果子
