在模具、覆盖件的检测中，经常遇到没有特定基准，或则指定的基准位置无法用常规的方法找正，此时就必须采用一些特殊的方法进行找正：自由曲面的六点找正
在日常检测中，经常碰到很多曲面检测，这些曲面零件指定的基准位置无法用常规的方法找正，此时就必须根据零件实际情况，在曲面上选择六点，这六点应尽可能的覆盖整个曲面零件，而且是有实际意义的检测点。通过这样的点建立出来的坐标系才是有实际意义的。这种利用自由曲面的六点就可以实现零件找正的方法即为自由曲面的六点找正。
$$/* Header
DMISMN/'Created by [爱科腾瑞科技(北京)有限公司-091521-DEMO-11022(华清)] on 星期五, 六月 18, 2021', 4.0
UNITS/MM, ANGDEC, MMPS
WKPLAN/XYPLAN
PRCOMP/ON
TECOMP/ON
FLY/1.0000
MODE/MAN
SNSET/APPRCH, 2.0000
SNSET/RETRCT, 2.0000
SNSET/DEPTH, 0.0000
SNSET/SEARCH, 10.0000
SNSET/CLRSRF, 20.0000
RECALL/D(MCS)
SNSLCT/S(40-D2)
GEOALG/BF, LSTSQR
GEOALG/ANGLB, DEFALT
GEOALG/CIRCLE, LSTSQR
GEOALG/ARC, LSTSQR
GEOALG/PLANE, LSTSQR
$$
$$
$$*/
MODE/MAN
F(PT1)=FEAT/POINT,CART,5.7678,56.5329,0.0000,0.0000,0.0000,1.0000
MEAS/POINT, F(PT1), 1
PTMEAS/CART, 5.7678,56.5329,0.0000,0.0000,0.0000,1.0000
ENDMES
F(PT2)=FEAT/POINT,CART,5.5760,7.3916,0.0000,0.0000,0.0000,1.0000
MEAS/POINT, F(PT2), 1
PTMEAS/CART, 5.5760,7.3916,0.0000,0.0000,0.0000,1.0000
ENDMES
F(PT3)=FEAT/POINT,CART,58.2643,5.0255,0.0000,0.0000,0.0000,1.0000
MEAS/POINT, F(PT3), 1
PTMEAS/CART, 58.2643,5.0255,0.0000,0.0000,0.0000,1.0000
ENDMES
F(PT4)=FEAT/POINT,CART,5.3099,0.0000,-2.9085,-0.0000,-1.0000,-0.0000
MEAS/POINT, F(PT4), 1
PTMEAS/CART, 5.3099,0.0000,-2.9085,-0.0000,-1.0000,-0.0000
ENDMES
F(PT5)=FEAT/POINT,CART,60.0186,0.0000,-3.9024,-0.0000,-1.0000,-0.0000
MEAS/POINT, F(PT5), 1
PTMEAS/CART, 60.0186,0.0000,-3.9024,-0.0000,-1.0000,-0.0000
ENDMES
F(PT6)=FEAT/POINT,CART,0.0000,4.7312,-3.0176,-1.0000,0.0000,0.0000
MEAS/POINT, F(PT6), 1
PTMEAS/CART, 0.0000,4.7312,-3.0176,-1.0000,0.0000,0.0000
ENDMES
MA(MATDEF1) = MATDEF/F(CADM_1),FA(PT1),FA(PT2),FA(PT3),FA(PT4),FA(PT5),FA(PT6)
DMESW/COMAND, 'ITERATION/100'
D(CRD1)=LOCATE/MA(MATDEF1)
$$ Set.CAD2PCS.CADM_1
$$ Set.CADViewCenter.CADM_1
