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Rmeas help

mjdevries
I've been trying to figure out what PC-DMIS does with the RMEAS statement with the different numbers of Hits. I found some info that refers to the Rmeas with 3 hits as the "Flush/Gap" measurement. Can anyone explain the difference between the RMEAS with 1 hit versus the RMEAS with 3 hits? From analyzing the data I believe it has to do with the vector that is used when it takes the actual measurement. From what I've seen looking at data is the single hit RMEAS would be considered a "Surface/Edge" measurement where the edge is too thin to consider it having any thickness/depth.

From my own analysis it appears that the single hit version uses an approach vector that is perpendicular to the reference points vector. The vector I believe is derived by the unit vector of (|V1| X |V2|) X |V1|, where V1 is the vector on the surface point and V2 is the vector on the point being measured with RMEAS. The X represents the Cross Product function. The first cross product is done between the 2 vectors to obtain a vector normal to the 2 vectors. The cross product of the resulting vector & the surface vector then gives you a vector that is perpendicular to the surface vector V1, but in the same plane as V2.

Does anyone know what the 3 hit version does? 

F(F0954M009B) = FEAT/POINT,CART,2531.99,860.834,605.15,0.0437,0.9651,0.2584
  MEAS/POINT, F(F0954M009B), 1
  ENDMES
 T(XTOL_4)=TOL/CORTOL,XAXIS,0.0,0.0
 T(YTOL_4)=TOL/CORTOL,YAXIS,-0.15,0.15
 T(ZTOL_4)=TOL/CORTOL,ZAXIS,0.0,0.0
 T(VECTOL_4)=TOL/PROFP,0.0,0.0
 TEXT/OUTFIL,'F0954M009B - POINT - INSP=D METAL=0.686'
 OUTPUT/FA(F0954M009B),TA(XTOL_4),TA(YTOL_4),TA(ZTOL_4),TA(VECTOL_4)

  GOTO/2536.032,864.531,605.704
F(G0954M009B) = FEAT/POINT,CART,2524.03,857.084,605.007,0.9667,-0.2002,-0.1595
  RMEAS/POINT, F(G0954M009B), 1, FA(F0954M009B)
  ENDMES
 T(XTOL_5)=TOL/CORTOL,XAXIS,-0.15,0.15
 T(YTOL_5)=TOL/CORTOL,YAXIS,0.0,0.0
 T(ZTOL_5)=TOL/CORTOL,ZAXIS,0.0,0.0
 T(VECTOL_5)=TOL/PROFP,0.0,0.0
 TEXT/OUTFIL,'G0954M009B - HEDGE - INSP=D METAL=0.686'
 OUTPUT/FA(G0954M009B),TA(XTOL_5),TA(YTOL_5),TA(ZTOL_5),TA(VECTOL_5)
  GOTO/2536.032,864.531,605.704
Parents
  • I noticed that the code for the G7589A140 point has both Theo Thickness=0 and Edge Theo Thickness=0.711. What is the Edge Theo Thickness? When would that be used?

    I'm thinking that this might be in the direction that is tangent to the Edge point surface. This may be the very culprit that I'm looking for. My data appears to be shifted by an extra 0.711 in the direction normal to the gap surface, see the 0.711 dimension in the attached image.



    This is also not exactly an edge point, but a corner that only has a 48 degree bend. The circles are the points on the "Design" surface. The nominals are actually on the other side of material. The surface point is the one that is Red, the edge point is light blue circle.
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  • I noticed that the code for the G7589A140 point has both Theo Thickness=0 and Edge Theo Thickness=0.711. What is the Edge Theo Thickness? When would that be used?

    I'm thinking that this might be in the direction that is tangent to the Edge point surface. This may be the very culprit that I'm looking for. My data appears to be shifted by an extra 0.711 in the direction normal to the gap surface, see the 0.711 dimension in the attached image.



    This is also not exactly an edge point, but a corner that only has a 48 degree bend. The circles are the points on the "Design" surface. The nominals are actually on the other side of material. The surface point is the one that is Red, the edge point is light blue circle.
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