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

I managed to do this with lines built from points, apparently, but this only works on the same level with the AA centerline, I need to take a closer look at my alignment.

PNT3       =FEAT/POINT,CARTESIAN
            THEO/<6.1,0,20>,<1,0,-0.0000833>
            ACTL/<6.068,0,19.999>,<1,0,-0.0000833>
            MEAS/POINT,1,WORKPLANE
              MOVE/CLEARPLANE
              HIT/BASIC,NORMAL,<6.1,0,20>,<1,0,-0.0000833>,<6.068,0,19.999>,USE THEO=YES
            ENDMEAS/
PNT6       =FEAT/POINT,CARTESIAN
            THEO/<6.1,0,24>,<1,0,-0.0000833>
            ACTL/<6.032,0.001,24.001>,<1,0,-0.0000833>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<6.1,0,24>,<1,0,-0.0000833>,<6.032,0.001,24.001>,USE THEO=YES
            ENDMEAS/
PNT11      =FEAT/POINT,CARTESIAN
            THEO/<-6.1,0,20>,<-1,0,0.0000833>
            ACTL/<-6.1,-0.001,19.999>,<-1,0,0.0000833>
            MEAS/POINT,1,WORKPLANE
              MOVE/CLEARPLANE
              HIT/BASIC,NORMAL,<-6.1,0,20>,<-1,0,0.0000833>,<-6.1,-0.001,19.999>,USE THEO=YES
            ENDMEAS/
PNT12      =FEAT/POINT,CARTESIAN
            THEO/<-6.1,0,24>,<-1,0,0.0000833>
            ACTL/<-6.068,-0.002,24.001>,<-1,0,0.0000833>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<-6.1,0,24>,<-1,0,0.0000833>,<-6.068,-0.002,24.001>,USE THEO=YES
            ENDMEAS/
LIN1       =FEAT/LINE,CARTESIAN,UNBOUNDED,NO
            THEO/<6.1,0,20>,<0.0000674,0,1>
            ACTL/<6.068,0,19.999>,<-0.008818,0.0000823,0.9999611>
            CONSTR/LINE,BF,3D,PNT3,PNT6,,
            OUTLIER_REMOVAL/OFF,3
            FILTER/OFF,WAVELENGTH=0
LIN2       =FEAT/LINE,CARTESIAN,UNBOUNDED,NO
            THEO/<-6.1,0,20>,<0.000056,0,1>
            ACTL/<-6.1,-0.001,19.999>,<0.0081343,-0.0003252,0.9999669>
            CONSTR/LINE,BF,3D,PNT11,PNT12,,
            OUTLIER_REMOVAL/OFF,3
            FILTER/OFF,WAVELENGTH=0
SCN1       =FEAT/SET,CARTESIAN
            THEO/<0,0,22>,<-1,0,0>
            ACTL/<-0.017,-0.001,22>,<-1,0,0>
            CONSTR/SET,BASIC,LIN1,LIN2,,
DIM SYM1= SYMMETRY OF SET SCN1 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      0.200      0.000      0.016      0.016      0.000 #--------

Reply

Vladimir over 1 year ago

I managed to do this with lines built from points, apparently, but this only works on the same level with the AA centerline, I need to take a closer look at my alignment.

PNT3       =FEAT/POINT,CARTESIAN
            THEO/<6.1,0,20>,<1,0,-0.0000833>
            ACTL/<6.068,0,19.999>,<1,0,-0.0000833>
            MEAS/POINT,1,WORKPLANE
              MOVE/CLEARPLANE
              HIT/BASIC,NORMAL,<6.1,0,20>,<1,0,-0.0000833>,<6.068,0,19.999>,USE THEO=YES
            ENDMEAS/
PNT6       =FEAT/POINT,CARTESIAN
            THEO/<6.1,0,24>,<1,0,-0.0000833>
            ACTL/<6.032,0.001,24.001>,<1,0,-0.0000833>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<6.1,0,24>,<1,0,-0.0000833>,<6.032,0.001,24.001>,USE THEO=YES
            ENDMEAS/
PNT11      =FEAT/POINT,CARTESIAN
            THEO/<-6.1,0,20>,<-1,0,0.0000833>
            ACTL/<-6.1,-0.001,19.999>,<-1,0,0.0000833>
            MEAS/POINT,1,WORKPLANE
              MOVE/CLEARPLANE
              HIT/BASIC,NORMAL,<-6.1,0,20>,<-1,0,0.0000833>,<-6.1,-0.001,19.999>,USE THEO=YES
            ENDMEAS/
PNT12      =FEAT/POINT,CARTESIAN
            THEO/<-6.1,0,24>,<-1,0,0.0000833>
            ACTL/<-6.068,-0.002,24.001>,<-1,0,0.0000833>
            MEAS/POINT,1,WORKPLANE
              HIT/BASIC,NORMAL,<-6.1,0,24>,<-1,0,0.0000833>,<-6.068,-0.002,24.001>,USE THEO=YES
            ENDMEAS/
LIN1       =FEAT/LINE,CARTESIAN,UNBOUNDED,NO
            THEO/<6.1,0,20>,<0.0000674,0,1>
            ACTL/<6.068,0,19.999>,<-0.008818,0.0000823,0.9999611>
            CONSTR/LINE,BF,3D,PNT3,PNT6,,
            OUTLIER_REMOVAL/OFF,3
            FILTER/OFF,WAVELENGTH=0
LIN2       =FEAT/LINE,CARTESIAN,UNBOUNDED,NO
            THEO/<-6.1,0,20>,<0.000056,0,1>
            ACTL/<-6.1,-0.001,19.999>,<0.0081343,-0.0003252,0.9999669>
            CONSTR/LINE,BF,3D,PNT11,PNT12,,
            OUTLIER_REMOVAL/OFF,3
            FILTER/OFF,WAVELENGTH=0
SCN1       =FEAT/SET,CARTESIAN
            THEO/<0,0,22>,<-1,0,0>
            ACTL/<-0.017,-0.001,22>,<-1,0,0>
            CONSTR/SET,BASIC,LIN1,LIN2,,
DIM SYM1= SYMMETRY OF SET SCN1 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      0.200      0.000      0.016      0.016      0.000 #--------

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