Xactmeasure nominals change from run to run.

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Xactmeasure nominals change from run to run.

    I'm running version 2014, for what it's worth

    I have a pair of holes I'm trying to measure. Hole 2 uses hole 1 as a datum, and the other datums are a bit awkward, but nothing ridiculous. However, 2 back-to-back runs of the same part can give me up to 0.05mm of difference between the two results. That's not the worst problem, though. The nominals that it's using to get those results is changing drastically from run to run. One run, the true position output will say the X nominal is something like 37.5mm, the next run it will say that same distance should be 13.7mm. Either way is completely disregarding actual dimensions I've put in. I've tried toggling Fit To Datums, I've used both Current Alignment and Datum Reference Frame Alignment. Just when I get a few matching reports in a row and think it's sorted, the next one will be different again. I'd like to think my alignment is solid, but obviously SOMETHING isn't right.

    I can attach program excerpts and info as needed (I just figured it'd be a bit obtrusive to copy/paste the whole program if it wasn't needed)

  • #2
    Post your Code, you use auto features? you using a CAD? are all your features to size and location? Is the sky blue? Did we go to different schools together?
    (In Memory of my Loving wife, "Ronda" who I lost March 7, 2016. I love you baby.)
    They say "Nobody's Perfect." I must be Nobody.

    Comment


    • Kp61dude!
      Kp61dude! commented
      Editing a comment
      I look forward to anything Kirby on this forum.

  • #3
    The holes being measured are auto features, yes using CAD. One hole is a different size in the CAD model than the current part, but both are to size for the nominals. Location is a definite no, as we don't have any way to verify a part besides the CMM.

    Standby, I'll post code in a sec.

    Comment


    • #4
      Here's the program, minus startup, Initial alignment features, move points, and formatting, plus an attached copy of a report so you can see the nominals. (I have both Xact and Legacy for the sake of comparison)
      Code:
      A1         =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
                  ALIGNMENT/LEVEL,ZPLUS,PLN1
                  ALIGNMENT/END
      A2         =ALIGNMENT/START,RECALL:A1,LIST=YES
                  ALIGNMENT/ROTATE,XPLUS,TO,LIN1,ABOUT,ZPLUS
                  ALIGNMENT/END
      A3         =ALIGNMENT/START,RECALL:A2,LIST=YES
                  ALIGNMENT/TRANS,XAXIS,CIR1
                  ALIGNMENT/TRANS,YAXIS,CIR1
                  ALIGNMENT/TRANS,ZAXIS,PLN1
                  ALIGNMENT/END
                  MODE/DCC
      PLNK       =FEAT/PLANE,CARTESIAN,TRIANGLE
                  THEO/<0.918,-2.249,0>,<0,0,1>
                  ACTL/<0.917,-2.255,0.034>,<-0.0020129,0.0029771,0.9999935>
                  MEAS/PLANE,4
                  HIT/BASIC,NORMAL,<-10.337,-9.79,0>,<0,0,1>,<-10.34,-9.797,0.024>,USE THEO=YES
                  HIT/BASIC,NORMAL,<6.06,-13.039,0>,<0,0,1>,<6.061,-13.044,0.086>,USE THEO=YES
                  HIT/BASIC,NORMAL,<13.289,4.616,0>,<0,0,1>,<13.288,4.611,0.03>,USE THEO=YES
                  HIT/BASIC,NORMAL,<-5.34,9.215,0>,<0,0,1>,<-5.339,9.209,-0.005>,USE THEO=YES
                  ENDMEAS/
      PNT1       =FEAT/POINT,CARTESIAN
                  THEO/<-30.596,-18.262,-17>,<-0.0005458,-0.9999835,-0.0057203>
                  ACTL/<-30.6,-18.208,-17.848>,<-0.0005458,-0.9999835,-0.0057203>
                  MEAS/POINT,1,WORKPLANE
                  HIT/BASIC,NORMAL,<-30.596,-18.262,-17.849>,<-0.0005458,-0.9999835,-0.0057203>,<-30.6,-18.208,-17.848>,USE THEO=YES
                  ENDMEAS/
      PNT2       =FEAT/POINT,CARTESIAN
                  THEO/<-13.315,-18.263,-17>,<-0.0005458,-0.9999835,-0.0057203>
                  ACTL/<-13.318,-18.197,-19.374>,<-0.0005458,-0.9999835,-0.0057203>
                  MEAS/POINT,1,WORKPLANE
                  HIT/BASIC,NORMAL,<-13.315,-18.263,-19.374>,<-0.0005458,-0.9999835,-0.0057203>,<-13.318,-18.197,-19.374>,USE THEO=YES
                  ENDMEAS/
      LIN2       =FEAT/LINE,CARTESIAN,UNBOUNDED,NO
                  THEO/<-30.596,-18.262,-17>,<1,-0.0000411,0>
                  ACTL/<-30.6,-18.208,-17.848>,<0.9961233,0.0006086,-0.0879661>
                  CONSTR/LINE,BF,3D,PNT1,PNT2,,
                  OUTLIER_REMOVAL/OFF,3
                  FILTER/OFF,WAVELENGTH=0
      CIR2       =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
                  THEO/<0.031,-0.008,0>,<0.0179592,-0.0057301,0.9998223>,10.398
                  ACTL/<0.14,-0.044,0.008>,<-0.0033117,0.0026892,0.9999909>,10.524
                  TARG/<0.031,-0.008,0>,<0.0179592,-0.0057301,0.9998223>
                  START ANG=227.749,END ANG=405.449
                  ANGLE VEC=<0.6777621,0.7352382,-0.0079605>
                  DIRECTION=CCW
                  SHOW FEATURE PARAMETERS=NO
                  SHOW CONTACT PARAMETERS=YES
                    NUMHITS=5,DEPTH=1.3,PITCH=0
                    SAMPLE METHOD=SAMPLE_HITS
                    SAMPLE HITS=3,SPACER=2
                    AVOIDANCE MOVE=BOTH,DISTANCE=10
                    FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
                  SHOW HITS=NO
      A4         =ALIGNMENT/START,RECALL:A3,LIST=YES
                  ALIGNMENT/LEVEL,ZPLUS,PLNK
                  ALIGNMENT/ROTATE,XPLUS,TO,LIN2,ABOUT,ZPLUS
                  ALIGNMENT/TRANS,XAXIS,CIR2
                  ALIGNMENT/TRANS,YAXIS,CIR2
                  ALIGNMENT/TRANS,ZAXIS,PLNK
                  ALIGNMENT/END
      PLNG       =FEAT/PLANE,CARTESIAN,TRIANGLE
                  THEO/<6.853,22.777,-0.244>,<-0.5605086,0.8280161,0.0148144>
                  ACTL/<6.93,22.65,-0.245>,<-0.5609837,0.8277121,0.0137845>
                  MEAS/PLANE,3
                  HIT/BASIC,NORMAL,<11.372,25.679,8.584>,<-0.5605086,0.8280161,0.0148144>,<11.437,25.557,8.586>,USE THEO=YES
                  HIT/BASIC,NORMAL,<-0.226,17.917,3.598>,<-0.5605086,0.8280161,0.0148144>,<-0.146,17.79,3.597>,USE THEO=YES
                  HIT/BASIC,NORMAL,<9.412,24.737,-12.914>,<-0.5605086,0.8280161,0.0148144>,<9.499,24.602,-12.917>,USE THEO=YES
                  ENDMEAS/
      CIRM       =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
                  THEO/<-0.054,0.018,-2.94>,<0.0179659,-0.0057261,0.9998222>,8
                  ACTL/<0.287,0.219,-3.153>,<0.0179659,-0.0057261,0.9998222>,8.12
                  TARG/<-0.054,0.018,-2.94>,<0.0179659,-0.0057261,0.9998222>
                  START ANG=134.8,END ANG=134.8
                  ANGLE VEC=<0.6777318,0.7352661,-0.0079673>
                  DIRECTION=CCW
                  SHOW FEATURE PARAMETERS=NO
                  SHOW CONTACT PARAMETERS=YES
                    NUMHITS=7,DEPTH=1.3,PITCH=0
                    SAMPLE METHOD=SAMPLE_HITS
                    SAMPLE HITS=1,SPACER=2
                    AVOIDANCE MOVE=BOTH,DISTANCE=10
                    FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
                  SHOW HITS=NO
                  DATDEF/FEATURE=PLNK,K
                  DATDEF/FEATURE=PLNG,G
                  DATDEF/FEATURE=CIRM,M
      CIR3       =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
                  THEO/<-26.701,-5.585,-11.509>,<0.0179655,-0.0057269,0.9998222>,14.25
                  ACTL/<-26.512,-5.451,-11.487>,<0.0179655,-0.0057269,0.9998222>,14.3
                  TARG/<-26.701,-5.585,-11.509>,<0.0179655,-0.0057269,0.9998222>
                  START ANG=0,END ANG=360
                  ANGLE VEC=<0.6777318,0.7352661,-0.0079664>
                  DIRECTION=CCW
                  SHOW FEATURE PARAMETERS=NO
                  SHOW CONTACT PARAMETERS=YES
                    NUMHITS=7,DEPTH=2,PITCH=0
                    SAMPLE METHOD=SAMPLE_HITS
                    SAMPLE HITS=1,SPACER=2
                    AVOIDANCE MOVE=BOTH,DISTANCE=10
                    FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
                  SHOW HITS=NO
      CIR4       =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
                  THEO/<-27.15,-5.442,-36.468>,<0.0179655,-0.0057269,0.9998222>,14.25
                  ACTL/<-26.957,-5.334,-36.471>,<0.0179655,-0.0057269,0.9998222>,14.293
                  TARG/<-27.15,-5.442,-36.468>,<0.0179655,-0.0057269,0.9998222>
                  START ANG=0,END ANG=360
                  ANGLE VEC=<0.6777318,0.7352661,-0.0079664>
                  DIRECTION=CCW
                  SHOW FEATURE PARAMETERS=NO
                  SHOW CONTACT PARAMETERS=YES
                    NUMHITS=7,DEPTH=1,PITCH=0
                    SAMPLE METHOD=SAMPLE_HITS
                    SAMPLE HITS=0,SPACER=2
                    AVOIDANCE MOVE=BOTH,DISTANCE=10
                    FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
                  SHOW HITS=NO
      CYL1       =FEAT/CYLINDER,CARTESIAN,IN,LEAST_SQR,NO
                  THEO/<-26.952,-5.505,-25.488>,<-0.0179655,0.0057269,-0.9998222>,14.25,23.963
                  ACTL/<-26.762,-5.384,-25.479>,<-0.0178157,0.0046279,-0.9998306>,14.296,24.003
                  CONSTR/CYLINDER,BF,CIR3,CIR4,,
      CFLOC1 =POSITION : CIRM
                  FEATCTRLFRAME/SHOWNOMS=NO,SHOWPARAMS=YES,SHOWEXPANDED=YES
                  CADGRAPH=OFF,REPORTGRAPH=OFF,TEXT=OFF,MULT=10.00,ARROWDENSITY=100,OUTPUT=BOTH,UNITS=MM
                  COMPOSITE=NO,FIT TO DATUMS=NO,DEV PERPEN CENTERLINE=ON,OUTPUT ALIGNMENT=Current Alignment
                  CUSTOMIZED DRF=NO
                  STANDARDTYPE=CUSTOM
                    SIZE TOLERANCES/1,DIAMETER,8,0.25,0
                    PRIMARY DIMENSION/POSITION,DIAMETER,0.25,MMC,G,K,<dat>
                    SECONDARY DIMENSION/<Dim>,<tol>,<MC>,<dat>,<dat>,<dat>
                    NOTE/FCFLOC1
                  FEATURES/CIRM,,
      FCFLOC2 =POSITION : CYL1
                  FEATCTRLFRAME/SHOWNOMS=NO,SHOWPARAMS=YES,SHOWEXPANDED=YES
                  CADGRAPH=OFF,REPORTGRAPH=OFF,TEXT=OFF,MULT=10.00,ARROWDENSITY=100,OUTPUT=REPORT,UNITS=MM
                  COMPOSITE=NO,FIT TO DATUMS=NO,DEV PERPEN CENTERLINE=ON,OUTPUT ALIGNMENT=Current Alignment
                  CUSTOMIZED DRF=NO
                  STANDARDTYPE=CUSTOM
                    SIZE TOLERANCES/1,DIAMETER,14.25,0.1,0.1
                    PRIMARY DIMENSION/POSITION,DIAMETER,0.25,MMC,<PZ>,<len>,G,K,M,<MC>
                    SECONDARY DIMENSION/<Dim>,<tol>,<MC>,G,K,<dat>
                    NOTE/FCFLOC2
                  FEATURES/CYL1,,
      DIM LOC79= POSITION OF CIRCLE CIRM  UNITS=MM ,$
      GRAPH=OFF  TEXT=OFF  MULT=10.00  OUTPUT=REPORT  FIT TO DATUMS=OFF  DEV PERPEN CENTERLINE=OFF  DISPLAY=DIAMETER
      AX    NOMINAL       +TOL       -TOL      BONUS       MEAS        DEV     OUTTOL
      Y       0.018                                       0.219      0.201           
      Z      -2.940                                      -3.153     -0.214           
      DF      8.000      0.250      0.000      0.120      8.120      0.120      0.000 ----#----
      TP        MMC      0.010                 0.120      0.587      0.587      0.457 -------->
      END OF DIMENSION LOC79
      DIM LOC80= POSITION OF CYLINDER CYL1  USE AXIS=AVERAGE  REF LENGTH=0.000  UNITS=MM ,$
      GRAPH=OFF  TEXT=OFF  MULT=10.00  OUTPUT=REPORT  FIT TO DATUMS=OFF  DEV PERPEN CENTERLINE=OFF  DISPLAY=DIAMETER
      AX    NOMINAL       +TOL       -TOL      BONUS       MEAS        DEV     OUTTOL
      Y      -5.505                                      -5.384      0.122           
      Z     -25.488                                     -25.479      0.009           
      DF     14.250      0.100      0.100      0.146     14.296      0.046      0.000 ------#--
      TP        MMC      0.010                 0.146      0.244      0.244      0.088 -------->
      END OF DIMENSION LOC80
      Attached Files

      Comment


      • #5
        YUCK!!!!!!!! first of all square up some of your planes, circles, and other stuff. Your vector hits on your features are telling DMIS to take your hits awkward. Plane vector hits 0,0,1. Some of your circles.

        Code:
        CIR3       =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
                    THEO/<-26.701,-5.585,-11.509>,<0.0179655,-0.0057269,0.9998222>,14.25
                    ACTL/<-26.512,-5.451,-11.487>,<0.0179655,-0.0057269,0.9998222>,14.3
                    TARG/<-26.701,-5.585,-11.509>,<0.0179655,-0.0057269,0.9998222>
                    START ANG=0,END ANG=360
                    ANGLE VEC=<0.6777318,0.7352661,-0.0079664>
                    DIRECTION=CCW
                    SHOW FEATURE PARAMETERS=NO
                    SHOW CONTACT PARAMETERS=YES
                      NUMHITS=7,DEPTH=2,PITCH=0
                      SAMPLE METHOD=SAMPLE_HITS
                      SAMPLE HITS=1,SPACER=2
                      AVOIDANCE MOVE=BOTH,DISTANCE=10
                      FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
                    SHOW HITS=NO
        CIR3       =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
                    THEO/<-26.701,-5.585,-11.509>,<0,0,1>,14.25
                    ACTL/<-26.512,-5.451,-11.487>,<0.0179655,-0.0057269,0.9998222>,14.3
                    TARG/<-26.701,-5.585,-11.509>,<0,0,1>
                    START ANG=0,END ANG=360
                    ANGLE VEC=<0.6777318,0.7352661,-0.0079664>
                    DIRECTION=CCW
                    SHOW FEATURE PARAMETERS=NO
                    SHOW CONTACT PARAMETERS=YES
                      NUMHITS=7,DEPTH=2,PITCH=0
                      SAMPLE METHOD=SAMPLE_HITS
                      SAMPLE HITS=1,SPACER=2
                      AVOIDANCE MOVE=BOTH,DISTANCE=10
                      FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
                    SHOW HITS=NO
        Go through the rest of the program and clean up your vectors.
        (In Memory of my Loving wife, "Ronda" who I lost March 7, 2016. I love you baby.)
        They say "Nobody's Perfect." I must be Nobody.

        Comment


        • #6
          Will do.

          Comment


          • #7
            Keep in mind when positioning Cylinders, Xact measure will always report the Worse Axis. You can see this on the report as (End PT) or (Start PT) next to the feature in the deviation section. You are constructing a cylinder from two circles that have different X and Y nominals. This will cause your reporting nominal to change depending on which circle has a higher deviation. This behavior is normal. In your legacy dimension, you're reporting the average axis.

            Comment


            • #8
              Originally posted by Sora5 View Post
              Keep in mind when positioning Cylinders, Xact measure will always report the Worse Axis. You can see this on the report as (End PT) or (Start PT) next to the feature in the deviation section. You are constructing a cylinder from two circles that have different X and Y nominals. This will cause your reporting nominal to change depending on which circle has a higher deviation. This behavior is normal. In your legacy dimension, you're reporting the average axis.
              If I change the dimension to measure only one circle it does appear to be consistent. I'll run a bunch of parts and see if this clears it up.

              Comment

              Related Topics

              Collapse

              Working...
              X