angle nominal

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  • angle nominal

    Hi guys, I have a question regarding how PC-DMIS calculates angles. My part is gas turbine blade (3.7 MR1).
    I have a report that dimensions angle in Deg,Min,Sec. I usually checking 4 angles on upper bearing flank, and 4 angles on lower bearing flank for 45 degrees. All looks OK just one of them don’t show same direction of deviation like others.
    If I set on nominal exactly 45,00,00 degree, my results is 45,05,24 ,but on the other hand,
    If I set on nominal just 44,59,59 degree, my results is 44,54,36. It is absolutely same deviation but on opposite direction. Could someone tell me where I am going wrong.

    Thanks,
    Lubo

  • #2
    What kind of feature is it? (Line, plane, etc.)
    It could be the direction you are probing. Can you post some of the code? We may be able to see something you are missing.
    When in doubt, post code. A second set of eyes might see something you missed.
    sigpic

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    • #3
      That feature is line. It's made by 8 pnts. I have plenty of other programs with same construction, but I never seen something like this.Here is part of my code:
      LIN_TE_CV_SMALL=FEAT/LINE,RECT,UNBND
      THEO/40,10.386,-13.337,0,-0.7069431,0.7072704
      ACTL/40.001,10.386,-13.334,0,-0.7082158,0.7059961
      CONSTR/LINE,BF,2D,PNT_CV_TE1,PNT_CV_TE2,PNT_CV_TE3,PNT_CV _TE4,PNT_CV_TE5,PNT_CV_TE6,PNT_CV_TE7,PNT_CV_TE8,,
      OUTLIER_REMOVAL/OFF,3
      FILTER/OFF,WAVELENGTH=0
      DIM 45° !!!!_1= 2D ANGLE (TRUE) FROM LINE LIN_TE_CV_SMALL TO ZAXIS ,$
      GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
      AX NOMINAL MEAS +TOL -TOL OUTTOL
      A 44,59,59 44,54,36 0,05,00 0,05,00 0,00,23 <--------
      DIM 45° !!!!_2= 2D ANGLE (TRUE) FROM LINE LIN_TE_CV_SMALL TO ZAXIS ,$
      GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
      AX NOMINAL MEAS +TOL -TOL OUTTOL
      A 45,00,00 45,05,24 0,04,59 0,04,

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      • #4
        Originally posted by Lubo Jocic
        That feature is line. It's made by 8 pnts. I have plenty of other programs with same construction, but I never seen something like this.Here is part of my code:
        LIN_TE_CV_SMALL=FEAT/LINE,RECT,UNBND
        THEO/40,10.386,-13.337,0,-0.7069431,0.7072704
        ACTL/40.001,10.386,-13.334,0,-0.7082158,0.7059961
        CONSTR/LINE,BF,2D,PNT_CV_TE1,PNT_CV_TE2,PNT_CV_TE3,PNT_CV _TE4,PNT_CV_TE5,PNT_CV_TE6,PNT_CV_TE7,PNT_CV_TE8,,
        OUTLIER_REMOVAL/OFF,3
        FILTER/OFF,WAVELENGTH=0
        DIM 45° !!!!_1= 2D ANGLE (TRUE) FROM LINE LIN_TE_CV_SMALL TO ZAXIS ,$
        GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
        AX NOMINAL MEAS +TOL -TOL OUTTOL
        A 44,59,59 44,54,36 0,05,00 0,05,00 0,00,23 <--------
        DIM 45° !!!!_2= 2D ANGLE (TRUE) FROM LINE LIN_TE_CV_SMALL TO ZAXIS ,$
        GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
        AX NOMINAL MEAS +TOL -TOL OUTTOL
        A 45,00,00 45,05,24 0,04,59 0,04,
        Your tolerancing is different. But I can't see why it is reporting different. Do you have a +/- sign that isn't showing?
        When in doubt, post code. A second set of eyes might see something you missed.
        sigpic

        Comment


        • #5
          You are right. Tolerancing is different, that is my fault. It will be same results, if I will put in same tolarancies. I can't put +/- sign to this angle dimensions. In other lines is everything OK and I don't need use +/- sign.
          I had similar problem times ago, that same angles for example on convex side low bearing flank of blade must be same direction on leading and trailing edge. Sometime they appear on opposite direction. I found that is easy to sorted out, that I changed line to offset line. And after that offset back to zero. This think change all my lines to proper direction, but I don’t know what happened in this case.

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