Alignment question

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  • Alignment question

    I have a part that has been assigned to me to write a CMM program for. The part has multiple datum structures called out on it. The first part of the program is pretty straight forward for the most part. I am struggling to understand how to setup an alignment to measure the counter bore per the datum structre. I level Datum E to the Z plus. Where I get lost is on the on the rotate to: I assume the Y plus about the Z plus. I don't know why the tetrahedron rotates they way it does? Datum E is the drilled .125 hole on a compound angle, datum D is a partial OD and datum C is U shaped cut out
    Attached Files

  • #2
    Can you post a snippet of the exact print callout? Or re-draw it somehow? Can you post your alignment code? Answers to these questions will get you better replies.

    Comment


    • #3
      This is the alignment I used to measure datum E

      DATUMS_B_D_C_ALIGN=ALIGNMENT/START,RECALLATUMS_B_A_C_ALIGN,LIST=YES
      ALIGNMENT/LEVEL,YPLUS,CONSTRUCTED_DATUM_B_POINTS
      ALIGNMENT/ROTATE_CIRCLE,ZPLUS,TO,DATUM_D,AND,DATUM_C,ABOUT,Y PLUS
      ALIGNMENT/TRANS,XAXIS,DATUM_D
      ALIGNMENT/TRANS,ZAXIS,DATUM_D
      ALIGNMENT/TRANS,YAXIS,CONSTRUCTED_DATUM_B_POINTS
      ALIGNMENT/END
      TIP/T1A60B150, SHANKIJK=-0.433, -0.75, 0.5, ANGLE=130.8934
      MOVE/POINT,NORMAL,<-.294,-.47,0.3490>
      DATUM_E =FEAT/CONTACT/CYLINDER/DEFAULT,CARTESIAN,IN,LEAST_SQR
      THEO/<-0.2369,-0.3686,0.2823>,<-0.4545195,-0.7071068,0.5416752>,0.1094,0.4433
      ACTL/<-0.2369,-0.3686,0.2823>,<-0.4545195,-0.7071068,0.5416752>,0.1094,0.4433
      TARG/<-0.2369,-0.3686,0.2823>,<-0.4545195,-0.7071068,0.5416752>
      START ANG=0,END ANG=360
      ANGLE VEC=<0.7660444,0,0.6427876>
      DIRECTION=CCW
      SHOW FEATURE PARAMETERS=NO
      SHOW CONTACT PARAMETERS=NO
      Attached Files

      Comment


      • #4
        Well with little of what your given. I would say construct a line from E to D. might have to create points from the 2.

        Level to Datum E
        Rotate the line to X or Y about Z
        Origin Datum E to X
        Origin Datum E to Y
        Origin Datum C to Z <<<<<<<<<<<<create a centerpoint from That "U" shape

        Or If you have Xactmeasure you can use this and call out Datum definitions and assign the proper features the correct letters and you don't have to change your alignment.

        (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.

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        • #5
          What kind of feature did you create to make the “Constructed Datum B Pnts”? Was it a plane? A scan? I believe constructed features in alignments can be a problem but a scan will not define the vector like a plane will.

          Comment


          • Radar
            Radar commented
            Editing a comment
            Datum B is a plane which would have been visible had I not covered it up with the yellow stick note. To my way of thinking the counter bore should be tolerance to datums E primary and B secondary. all they do is braze some tubes into each counter bore. Water flows through two of them and air through the third one.

          • william
            william commented
            Editing a comment
            What’s the measured vector of the Datum B plane?

          • Radar
            Radar commented
            Editing a comment
            Sorry it has taken so long to get back to this my priorities had been changed and this was put on the back burner. This is what the vectors for datum B came out as

            CONSTRUCTED_DATUM_B_POINTS=FEAT/PLANE,CARTESIAN,TRIANGLE,NO
            THEO/<0,-1.99,0.23147>,<0,1,0>
            ACTL/<0.00091,-1.98993,0.23211>,<-0.0062717,0.99998,-0.0007775>
            CONSTR/PLANE,BF,PNT1,PNT2,PNT3,PNT4,PNT5,PNT6,PNT7,PNT8,,
            OUTLIER_REMOVAL/OFF,3
            FILTER/OFF,WAVELENGTH=0

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