RationalDMIS样例点测量圆避开螺纹孔方法

对于检具基准圆，一般会有两个定位销孔，两个沉头孔（锁螺丝）,对于PC DMIS 和RationalDMIS直接使用软件向量创建测量，面上三点一般会有一点采集孔里。
软件在RationalDMIS5.5版本以后，增加了：“用户控制向量创建采样点位置”

对于低版本如何实现？


一般圆的测量规则如下:

 1.大范围取点（避开倒角位置）

 2.均匀取点

 3.在同一高度上测量

 4，圆所在的圆柱或者圆锥与坐标轴不平行，需要使用向量创建测量(DMIS关键字是VECBLD)，或建立合适的坐标系，解决探头补偿方向和余弦误差等问题，可以直接用默认的工作平面去测量。

通常, 要测量一个两维元素比如一个圆,这个圆在一个不与任何坐标平面平行的平面内,需要一下几步:

a. 测量圆所在的平面.
b. 拖放这个平面到工作平面选择窗口.
c. 测量平面上的圆.
"向量构建"方法基本上也是重复这几步,只是没有创建平面元素.它把平面测量结合到圆自参考测量中去.

由以上可知，对于圆孔端面圆，可以分解测量，先测量一个平面，在测量一个圆，投影平面为圆孔上端面。

建立坐标系的步骤：

1.粗建坐标系

2.精建坐标系
拾取三个圆孔上端面，三个平面，自动测量平面，避开圆孔。测量三个基准圆孔，构造：“投影”三个圆孔分别向圆孔上端面投影。

建立坐标系的步骤：
1.粗建坐标系

DMISMN/'Created by [山涧果子] on 星期四, 十二月 21, 2017', 4.0

UNITS/MM, ANGDEC

WKPLAN/XYPLAN

PRCOMP/ON

TECOMP/ON

FLY/1.000000

MODE/PROG, MAN

SNSET/APPRCH, 2.000000

SNSET/RETRCT, 2.000000

SNSET/DEPTH, 2.000000

SNSET/SEARCH, 10.000000

SNSET/CLRSRF, 0.000000

RECALL/D(MCS)

SNSLCT/S(ROOTSN1)

GEOALG/CIRCLE, LSTSQR

GEOALG/ARC, LSTSQR

GEOALG/PLANE, LSTSQR

$$

$$

MODE/MAN

F(CIR1) = FEAT/CIRCLE,INNER,CART, 840.000000, -550.000000, 600.000000,$

 -1.000000, 0.000000, -0.000000, 10.000000

$$ Empty VECBLD Block

RMEAS/CIRCLE, F(CIR1), 4, VECBLD, 3.000000, 3

ENDMES

F(CIR2) = FEAT/CIRCLE,INNER,CART, 840.000000, -1000.000000, 600.000000,$

 -1.000000, 0.000000, -0.000000, 10.000000

$$ Empty VECBLD Block

RMEAS/CIRCLE, F(CIR2), 4, VECBLD, 3.000000, 3

ENDMES

F(CIR3) = FEAT/CIRCLE,INNER,CART, 840.000000, -550.000000, 900.000000,$

 -1.000000, 0.000000, -0.000000, 10.000000

$$ Empty VECBLD Block

RMEAS/CIRCLE, F(CIR3), 4, VECBLD, 3.000000, 3

ENDMES

F(CIR1) = FEAT/CIRCLE,INNER,CART, 840.000000, -550.000000, 600.000000,$

 -1.000000, 0.000000, -0.000000, 10.000000

F(CIR2) = FEAT/CIRCLE,INNER,CART, 840.000000, -1000.000000, 600.000000,$

 -1.000000, 0.000000, -0.000000, 10.000000

F(CIR3) = FEAT/CIRCLE,INNER,CART, 840.000000, -550.000000, 900.000000,$

 -1.000000, 0.000000, -0.000000, 10.000000

DMESW/COMAND,'3PtsCRDBestfitAveErr/OFF'

D(CRD1) = LOCATE/FA(CIR1), FA(CIR2), FA(CIR3)

$$ Set.CAD2PCS.CADM_1

$$ Set.CADViewCenter.CADM_1

TEXT/OPER, '请将测头移动到安全位置！'

MODE/PROG,MAN

SNSET/APPRCH, 2.0000

SNSET/RETRCT, 2.0000

SNSET/DEPTH, 2.0000

SNSET/SEARCH, 10.0000

SNSET/CLRSRF, 50

GOTO/700.000000, -550.000000, 600.000000

GOTO/810.000000, -550.000000, 600.000000

F(PLN1) = FEAT/PLANE,CART, 840.000000,-550.000000,600.000000, -1.000000,$

0.000000,-0.000000

$$ Measurement points are created through nominal points

MEAS/PLANE, F(PLN1), 3

  GOTO/CART,  789.000000, -550.000000, 600.000000

  GOTO/CART,  789.000000, -543.185059, 607.118408

  PTMEAS/CART,  840.000000, -543.185059, 607.118408, -1.000000, -0.000000,$

 -0.000000

  PTMEAS/CART,  840.000000, -542.179687, 592.705933, -1.000000, -0.000000,$

 -0.000000

  PTMEAS/CART,  840.000000, -559.115173, 593.516418, -1.000000, -0.000000,$

 -0.000000

  GOTO/CART,  810.000000, -550.000000, 600.000000

ENDMES

F(1K) = FEAT/CIRCLE,INNER,CART, 840.000000, -550.000000, 600.000000,$

 -1.000000, 0.000000, -0.000000, 10.000000

$$ Measurement points are created through nominal points

MEAS/CIRCLE, F(1K), 4

  GOTO/CART,  789.000000, -550.000000, 600.000000

  GOTO/CART,  789.000000, -550.000000, 602.000000

  GOTO/CART,  790.000000, -550.000000, 602.000000

  PTMEAS/CART,  842.000000, -550.000000, 605.000000, -0.000000, 0.000000,$

 -1.000000

  PTMEAS/CART,  842.000000, -555.000000, 600.000000, 0.000000, 1.000000,$

 -0.000000

  PTMEAS/CART,  842.000000, -550.000000, 595.000000, 0.000000, -0.000000,$

 1.000000

  PTMEAS/CART,  842.000000, -545.000000, 600.000000, -0.000000, -1.000000,$

 0.000000

  GOTO/CART,  790.000000, -548.000000, 600.000000

ENDMES

CONST/CIRCLE,F(1K),PROJCT,FA(1K),FA(PLN1)

GOTO/700.000000, -550.000000, 600.000000

GOTO/700.000000, -1000.000000, 600.000000

GOTO/810.000000, -1000.000000, 600.000000

F(PLN2) = FEAT/PLANE,CART, 840.000000, -1000.000000, 600.000000, -1.000000,$

 0.000000, -0.000000

$$ Measurement points are created through nominal points

MEAS/PLANE, F(PLN2), 3

  GOTO/CART,  789.000000, -1000.000000, 600.000000

  GOTO/CART,  789.000000, -992.688904, 607.151184

  PTMEAS/CART,  840.000000, -992.688904, 607.151184, -1.000000, -0.000000,$

 -0.000000

  PTMEAS/CART,  840.000000, -991.897278, 593.769897, -1.000000, -0.000000,$

 -0.000000

  PTMEAS/CART,  840.000000, -1007.628723, 593.359985, -1.000000, -0.000000,$

 -0.000000

  GOTO/CART,  810.000000, -1000.000000, 600.000000

ENDMES

F(2K) = FEAT/CIRCLE,INNER,CART, 840.000000, -1000.000000, 600.000000,$

 -1.000000, 0.000000, -0.000000, 10.000000

$$ Measurement points are created through nominal points

MEAS/CIRCLE, F(2K), 4

  GOTO/CART,  789.000000, -1000.000000, 600.000000

  GOTO/CART,  789.000000, -1000.000000, 602.000000

  GOTO/CART,  790.000000, -1000.000000, 602.000000

  PTMEAS/CART,  842.000000, -1000.000000, 605.000000, -0.000000, 0.000000,$

 -1.000000

  PTMEAS/CART,  842.000000, -1005.000000, 600.000000, 0.000000, 1.000000,$

 -0.000000

  PTMEAS/CART,  842.000000, -1000.000000, 595.000000, 0.000000, -0.000000,$

 1.000000

  PTMEAS/CART,  842.000000, -995.000000, 600.000000, -0.000000, -1.000000,$

 0.000000

  GOTO/CART,  790.000000, -998.000000, 600.000000

ENDMES

CONST/CIRCLE,F(2K),PROJCT,FA(2K),FA(PLN2)

GOTO/700.000000, -1000.000000, 600.000000

GOTO/700.000000, -550.000000, 900.000000

GOTO/810.000000, -550.000000, 900.000000

F(PLN3) = FEAT/PLANE,CART, 840.000000, -550.000000, 900.000000, -1.000000,$

 0.000000, -0.000000

$$ Measurement points are created through nominal points

MEAS/PLANE, F(PLN3), 3

  GOTO/CART,  789.000000, -550.000000, 900.000000

  GOTO/CART,  789.000000, -543.002991, 907.338196

  PTMEAS/CART,  840.000000, -543.002991, 907.338196, -1.000000, -0.000000,$

 -0.000000

  PTMEAS/CART,  840.000000, -540.795715, 892.309204, -1.000000, -0.000000,$

 -0.000000

  PTMEAS/CART,  840.000000, -559.368652, 892.356567, -1.000000, -0.000000,$

 -0.000000

  GOTO/CART,  810.000000, -550.000000, 900.000000

ENDMES

F(3K) = FEAT/CIRCLE,INNER,CART, 840.000000, -550.000000, 900.000000,$

 -1.000000, 0.000000, -0.000000, 10.000000

$$ Measurement points are created through nominal points

MEAS/CIRCLE, F(3K), 4

  GOTO/CART,  789.000000, -550.000000, 900.000000

  GOTO/CART,  789.000000, -550.000000, 902.000000

  GOTO/CART,  790.000000, -550.000000, 902.000000

  PTMEAS/CART,  842.000000, -550.000000, 905.000000, -0.000000, 0.000000,$

 -1.000000

  PTMEAS/CART,  842.000000, -555.000000, 900.000000, 0.000000, 1.000000,$

 -0.000000

  PTMEAS/CART,  842.000000, -550.000000, 895.000000, 0.000000, -0.000000,$

 1.000000

  PTMEAS/CART,  842.000000, -545.000000, 900.000000, -0.000000, -1.000000,$

 0.000000

  GOTO/CART,  790.000000, -548.000000, 900.000000

ENDMES

CONST/CIRCLE,F(3K),PROJCT,FA(3K),FA(PLN3)

F(1K) = FEAT/CIRCLE,INNER,CART, 840.000000, -550.000000, 600.000000,$

 -1.000000, -0.000000, 0.000000, 10.000000

F(2K) = FEAT/CIRCLE,INNER,CART, 840.000000, -1000.000000, 600.000000,$

 -1.000000, -0.000000, 0.000000, 10.000000

F(3K) = FEAT/CIRCLE,INNER,CART, 840.000000, -550.000000, 900.000000,$

 -1.000000, -0.000000, 0.000000, 10.000000

DMESW/COMAND,'3PtsCRDBestfitAveErr/OFF'

D(CRD2) = LOCATE/FA(1K), FA(2K), FA(3K)

$$ Set.CAD2PCS.CADM_1

$$ Set.CADViewCenter.CADM_1