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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
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  • In that picture, what you are calling an edge point, isn't an edge point, and (IMO) shouldn't be an edge point. It should be a vector point.

    INDENT is only used if INIT and PERM do NOT equal zero. If INIT and PERM are set to zero, then NO sample hit is taken on the surface at the INDENT value from the dge of the part.

    Edge Points:
    THEO/ACTL THICKNESS = SURFACE
    THEO/ACTL EDGE THICKNESS = EDGE

    Here is an example of what is what for which type of feature and what the different thickness values will give you.

    Well, I would have posted an image, but the STUPID site will not let me DELETE any attachments I have already uploaded. I'll have to try something else.

    Looks like crap, but here it is:
Reply
  • In that picture, what you are calling an edge point, isn't an edge point, and (IMO) shouldn't be an edge point. It should be a vector point.

    INDENT is only used if INIT and PERM do NOT equal zero. If INIT and PERM are set to zero, then NO sample hit is taken on the surface at the INDENT value from the dge of the part.

    Edge Points:
    THEO/ACTL THICKNESS = SURFACE
    THEO/ACTL EDGE THICKNESS = EDGE

    Here is an example of what is what for which type of feature and what the different thickness values will give you.

    Well, I would have posted an image, but the STUPID site will not let me DELETE any attachments I have already uploaded. I'll have to try something else.

    Looks like crap, but here it is:
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