Problem with symmetry

Hello colleagues
My problem is measuring symmetry, at the moment my A_A axis is a line of midpoints at 3.45 (point J) and 21.8 (point H). This is the center of the coordinate system x=0
I built planes from two opposite sides, created a set of them and measured the symmetry, but I got very strong deviations, although the x of this plane is not so bad.
I'm afraid it's an alignment issue, as the part itself is much more complex than what I've shown, but I hope I'm just not measuring the symmetry correctly.

Parents

Vladimir over 1 year ago

something...

FEAT/SET created from planes doesn't work for symmetry in XactMeasure.
Probe opposing points on each of the planes.
Use those points to create your FEAT/SET.

I tried to do this, but the results were even worse

PNT_L_1    =FEAT/POINT,CARTESIAN
            THEO/<-6.1,2.231,26.215>,<-1,0,0>
            ACTL/<-6.048,2.23,26.214>,<-1,0,0>
            MEAS/POINT,1,WORKPLANE
              MOVE/CLEARPLANE
              HIT/BASIC,NORMAL,<-6.1,2.231,26.215>,<-1,0,0.0000833>,<-6.048,2.23,26.214>,USE THEO=YES
            ENDMEAS/
PNT_L_2    =FEAT/POINT,CARTESIAN
            THEO/<-6.1,7.132,24.159>,<-1,0,0>
            ACTL/<-6.228,7.129,24.16>,<-1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<-6.1,7.132,24.159>,<-1,0,0.0000833>,<-6.228,7.129,24.16>,USE THEO=YES
            ENDMEAS/
PNT_L_3    =FEAT/POINT,CARTESIAN
            THEO/<-6.1,4.179,21.389>,<-1,0,0>
            ACTL/<-6.194,4.177,21.388>,<-1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<-6.1,4.179,21.389>,<-1,0,0.0000833>,<-6.194,4.177,21.388>,USE THEO=YES
            ENDMEAS/
PNT_L_4    =FEAT/POINT,CARTESIAN
            THEO/<-6.1,1.235,23.689>,<-1,0,0>
            ACTL/<-6.066,1.234,23.69>,<-1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<-6.1,1.235,23.689>,<-1,0,0.0000833>,<-6.066,1.234,23.69>,USE THEO=YES
            ENDMEAS/
PNT_R_1    =FEAT/POINT,CARTESIAN
            THEO/<6.1,3.906,26.934>,<1,0,0>
            ACTL/<6.118,3.906,26.933>,<1,0,0>
            MEAS/POINT,1,WORKPLANE
              MOVE/CLEARPLANE
              HIT/BASIC,NORMAL,<6.1,3.906,26.934>,<1,0,-0.0000833>,<6.118,3.906,26.933>,USE THEO=YES
            ENDMEAS/
PNT_R_2    =FEAT/POINT,CARTESIAN
            THEO/<6.1,1.016,23.865>,<1,0,0>
            ACTL/<6.01,1.016,23.865>,<1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<6.1,1.016,23.865>,<1,0,-0.0000833>,<6.01,1.016,23.865>,USE THEO=YES
            ENDMEAS/
PNT_R_3    =FEAT/POINT,CARTESIAN
            THEO/<6.1,3.275,21.295>,<1,0,0>
            ACTL/<6.043,3.276,21.295>,<1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<6.1,3.275,21.295>,<1,0,-0.0000833>,<6.043,3.276,21.295>,USE THEO=YES
            ENDMEAS/
PNT_R_4    =FEAT/POINT,CARTESIAN
            THEO/<6.1,6.104,23.793>,<1,0,0>
            ACTL/<6.006,6.106,23.794>,<1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<6.1,6.104,23.793>,<1,0,-0.0000833>,<6.006,6.106,23.794>,USE THEO=YES
            ENDMEAS/
SCN2       =FEAT/SET,CARTESIAN
            THEO/<0,3.635,23.917>,<-1,0,0>
            ACTL/<-0.045,3.634,23.917>,<-1,0,0>
            CONSTR/SET,BASIC,PNT_L_1,PNT_R_1,PNT_L_2,PNT_R_2,PNT_L_3,PNT_R_3,PNT_L_4,PNT_R_4,,
DIM SYM1= SYMMETRY OF SET SCN2 TO LINE LIN_AA    UNITS=MM ,$
GRAPH=OFF  TEXT=OFF  MULT=10.00  OUTPUT=BOTH
AX    NOMINAL       +TOL       -TOL       MEAS        DEV     OUTTOL
M        0.000      0.010      0.000      8.162      8.162      8.152 -------->

Reply

Vladimir over 1 year ago

something...

FEAT/SET created from planes doesn't work for symmetry in XactMeasure.
Probe opposing points on each of the planes.
Use those points to create your FEAT/SET.

I tried to do this, but the results were even worse

PNT_L_1    =FEAT/POINT,CARTESIAN
            THEO/<-6.1,2.231,26.215>,<-1,0,0>
            ACTL/<-6.048,2.23,26.214>,<-1,0,0>
            MEAS/POINT,1,WORKPLANE
              MOVE/CLEARPLANE
              HIT/BASIC,NORMAL,<-6.1,2.231,26.215>,<-1,0,0.0000833>,<-6.048,2.23,26.214>,USE THEO=YES
            ENDMEAS/
PNT_L_2    =FEAT/POINT,CARTESIAN
            THEO/<-6.1,7.132,24.159>,<-1,0,0>
            ACTL/<-6.228,7.129,24.16>,<-1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<-6.1,7.132,24.159>,<-1,0,0.0000833>,<-6.228,7.129,24.16>,USE THEO=YES
            ENDMEAS/
PNT_L_3    =FEAT/POINT,CARTESIAN
            THEO/<-6.1,4.179,21.389>,<-1,0,0>
            ACTL/<-6.194,4.177,21.388>,<-1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<-6.1,4.179,21.389>,<-1,0,0.0000833>,<-6.194,4.177,21.388>,USE THEO=YES
            ENDMEAS/
PNT_L_4    =FEAT/POINT,CARTESIAN
            THEO/<-6.1,1.235,23.689>,<-1,0,0>
            ACTL/<-6.066,1.234,23.69>,<-1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<-6.1,1.235,23.689>,<-1,0,0.0000833>,<-6.066,1.234,23.69>,USE THEO=YES
            ENDMEAS/
PNT_R_1    =FEAT/POINT,CARTESIAN
            THEO/<6.1,3.906,26.934>,<1,0,0>
            ACTL/<6.118,3.906,26.933>,<1,0,0>
            MEAS/POINT,1,WORKPLANE
              MOVE/CLEARPLANE
              HIT/BASIC,NORMAL,<6.1,3.906,26.934>,<1,0,-0.0000833>,<6.118,3.906,26.933>,USE THEO=YES
            ENDMEAS/
PNT_R_2    =FEAT/POINT,CARTESIAN
            THEO/<6.1,1.016,23.865>,<1,0,0>
            ACTL/<6.01,1.016,23.865>,<1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<6.1,1.016,23.865>,<1,0,-0.0000833>,<6.01,1.016,23.865>,USE THEO=YES
            ENDMEAS/
PNT_R_3    =FEAT/POINT,CARTESIAN
            THEO/<6.1,3.275,21.295>,<1,0,0>
            ACTL/<6.043,3.276,21.295>,<1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<6.1,3.275,21.295>,<1,0,-0.0000833>,<6.043,3.276,21.295>,USE THEO=YES
            ENDMEAS/
PNT_R_4    =FEAT/POINT,CARTESIAN
            THEO/<6.1,6.104,23.793>,<1,0,0>
            ACTL/<6.006,6.106,23.794>,<1,0,0>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<6.1,6.104,23.793>,<1,0,-0.0000833>,<6.006,6.106,23.794>,USE THEO=YES
            ENDMEAS/
SCN2       =FEAT/SET,CARTESIAN
            THEO/<0,3.635,23.917>,<-1,0,0>
            ACTL/<-0.045,3.634,23.917>,<-1,0,0>
            CONSTR/SET,BASIC,PNT_L_1,PNT_R_1,PNT_L_2,PNT_R_2,PNT_L_3,PNT_R_3,PNT_L_4,PNT_R_4,,
DIM SYM1= SYMMETRY OF SET SCN2 TO LINE LIN_AA    UNITS=MM ,$
GRAPH=OFF  TEXT=OFF  MULT=10.00  OUTPUT=BOTH
AX    NOMINAL       +TOL       -TOL       MEAS        DEV     OUTTOL
M        0.000      0.010      0.000      8.162      8.162      8.152 -------->

Children

TonyYaka over 1 year ago in reply to Vladimir

I would think opposing points should be the same value in the Z axis. In CAMIO software, the opposing points for a midplane must be the exact opposite from each other. Try making all your Z values at 24. This is just my advice, I'm still learning myself.
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