Rmeas help

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

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Matthew D. Hoedeman over 11 years ago

indent = the distance from the edge that it checks the surface to set the depth of the check.
spacer = the distance from nominal in the edge that it samples to calculate the ACTUAL vector of the edge
rmeas = relative measure, a feature it uses as "master" to check the feature.

RMEAS has nothing to do with '3 hits' or anything like that. It points to a feature that Pcdmis will use as a 'target' for the feature being measured. In the case of an edge point, it is usually a surface point (should be CLOSE to the edge point) and it uses the surface checks "high" or "low" to adjust where it will hit the edge point.

Sounds like you are in sore need of training and classes, this stuff is in the help files.
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Matthew D. Hoedeman over 11 years ago

indent = the distance from the edge that it checks the surface to set the depth of the check.
spacer = the distance from nominal in the edge that it samples to calculate the ACTUAL vector of the edge
rmeas = relative measure, a feature it uses as "master" to check the feature.

RMEAS has nothing to do with '3 hits' or anything like that. It points to a feature that Pcdmis will use as a 'target' for the feature being measured. In the case of an edge point, it is usually a surface point (should be CLOSE to the edge point) and it uses the surface checks "high" or "low" to adjust where it will hit the edge point.

Sounds like you are in sore need of training and classes, this stuff is in the help files.
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