Help on Symmetry

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  • Help on Symmetry

    Anyone tell me how to use the symmetry dimension tool

    Have a part with 3 holes and 2 angular faces, see attached sketch.
    I have created an alignment between holes 1 & 2 and placed the datum in hole 3.

    I have measured a plane on sides A & B then created an alignment plane through the Y axis, this I called datum C. My Drawing calls for the Symmetry of the two angled faces to 0.2mm about C but I cannot get the correct answer?
    The output is always zero & as a double check I have intersected the two side planes to generate a point that shows 0.011 off centre (0.022 symmetry?).

    Help Guys Please??????

    Sample code bellow
    PLN2_BASE =FEAT/PLANE,RECT,TRIANGLE
    THEO/25.407,-15.099,-33,0,0,-1
    ACTL/25.407,-15.101,-33.049,0.0001184,0.0001586,-1
    CONSTR/PLANE,BF,PNT1,PNT2,PNT17,PNT18,,
    OUTLIER_REMOVAL/OFF,3
    FILTER/OFF,WAVELENGTH=0
    A4 =ALIGNMENT/START,RECALL:CAD=PART,LIST=YES
    ALIGNMENT/LEVEL,ZMINUS,PLN2_BASE
    ALIGNMENT/ROTATE_CIRCLE,XPLUS,TO,,AND,,ABOUT,ZPLUS
    ALIGNMENT/TRANS,XAXIS,CIR4_CTR-HOLE_TOP
    ALIGNMENT/TRANS,YAXIS,CIR4_CTR-HOLE_TOP
    ALIGNMENT/TRANS,ZAXIS,PLN2_BASE
    ALIGNMENT/END
    PLN3_RIGHT_SIDE=FEAT/PLANE,RECT,TRIANGLE
    THEO/64.884,15.016,14.947,0.9543178,-0.2987935,0.0000012
    ACTL/65.194,14.929,14.99,0.9539854,-0.299852,0.0007343
    CONSTR/PLANE,BF,PNT3,PNT4,PNT5,PNT7,PNT8,PNT9,PNT6,,
    OUTLIER_REMOVAL/OFF,3
    FILTER/OFF,WAVELENGTH=0
    PLN4_LEFT_SIDE=FEAT/PLANE,RECT,TRIANGLE
    THEO/-65.158,15.888,14.142,-0.9543183,-0.298792,0.0000084
    ACTL/-65.459,15.799,14.197,-0.9539852,-0.2998536,0.0003685
    CONSTR/PLANE,BF,PNT13,PNT15,PNT16,PNT10,PNT11,PNT12,PNT14 ,,
    OUTLIER_REMOVAL/OFF,3
    FILTER/OFF,WAVELENGTH=0
    LIN1_RIGHT =FEAT/LINE,RECT,UNBND
    THEO/72.169,38.282,4,-0.2987947,-0.9543174,0
    ACTL/72.513,38.194,4.043,-0.2997982,-0.9540026,0
    CONSTR/LINE,BF,2D,PNT5,PNT4,PNT3,,
    OUTLIER_REMOVAL/OFF,3
    FILTER/OFF,WAVELENGTH=0
    LIN2_LEFT =FEAT/LINE,RECT,UNBND
    THEO/-71.401,35.829,4,0.2987873,-0.9543197,0
    ACTL/-71.728,35.737,4.054,0.2998278,-0.9539934,0
    CONSTR/LINE,BF,2D,PNT16,PNT15,PNT13,,
    OUTLIER_REMOVAL/OFF,3
    FILTER/OFF,WAVELENGTH=0
    WORKPLANE/XPLUS
    PLN9_CTR_X =FEAT/PLANE,RECT,TRIANGLE
    THEO/0,0,0,1,0,0
    ACTL/0,0,0,1,0,0
    CONSTR/PLANE,ALIGN,WORKPLANE
    WORKPLANE/ZPLUS
    DATDEF/FEATURE=PLN2_BASE,DATUM=A
    DATDEF/FEATURE=,DATUM=B
    DATDEF/FEATURE=PLN9_CTR_X,DATUM=C
    FCFSYM1 = SYMMETRY OF PLN3_RIGHT_SIDE,PLN4_LEFT_SIDE
    FEATCTRLFRAME/SHOWPARAMS=YES,SHOWEXPANDED=YES
    CADGRAPH=OFF REPORTGRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH UNITS=MM
    DIMENSION/SYMMETRY,.2,C
    NOTE/FCFSYM1
    FEATURES/PLN3_RIGHT_SIDE,PLN4_LEFT_SIDE,,
    PNT19_CC =FEAT/POINT,RECT
    THEO/0,-192.221,4,0.2987873,-0.9543197,0
    ACTL/0.011,-192.52,4.049,0.2998278,-0.9539934,0
    CONSTR/POINT,INT,LIN2_LEFT,LIN1_RIGHT
    DIM LOC1= LOCATION OF POINT PNT19_CC UNITS=MM ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
    X 0.000 0.050 0.050 0.011 0.011 0.000 -----#---
    Y -192.221 0.250 0.250 -192.520 -0.299 0.049 <--------
    END OF DIMENSION LOC1
    DIM ANGL1= 3D ANGLE FROM PLANE PLN4_LEFT_SIDE TO YAXIS ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
    A -17.095 0.900 0.900 -17.449 -0.354 0.000 --#------
    DIM ANGL3= 2D ANGLE FROM PLANE PLN3_RIGHT_SIDE TO YAXIS ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
    A 17.095 0.900 0.900 17.449 0.354 0.000 ------#--
    DIM ANGL2= 3D ANGLE FROM PLANE PLN4_LEFT_SIDE TO PLANE PLN3_RIGHT_SIDE ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
    A 34.192 1.800 1.800 34.898 0.706 0.000 ------#--
    Attached Files

  • #2
    Out of extreme curiosity, what standard is ref'd on your drawing? (14.5, iso??)
    Kev
    RFS Means Really Fussy Stuff

    When all you have is a hammer - everything looks like a nail....
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    • #3
      its iso, but Dat B was a mistake i made that i later deleted but did not del the ref to it in the prog.

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