TP Manual Calculation z,y,z

Hi guys,

Basically I'm measuring a bunch of parts for a capability study. Long story short I need to get true position on four similar features. For this instance I'm not sure how to accurately pull this off with the feature inside PC-DMIS since I'm trying to get it from 3 midpoints (1 in x, 1 in y, 1 in z). I figure I can use all the deviations and export the numbers into my excel and just formula it out. I would think the formula for a radius of a sphere would be the same for true position where TP would be the same as r. In that case r^2=x^2+y^2+z^2, or TP = SQRT(x*x+y*y+z*z). But on another forum post I saw, TP = SQRT(x^2+y^2++z^2)*2. What gives with the *2? They said that was for a circle? My shape is virtually a rectangular box. I don't understand how the middle of one object could be different from the middle of another object if it's "borders" were arranged differently?

Would, TP = SQRT(xdev^2+ydev^2+zdev^2), be the correct formula for getting TP on a rectangular box relative to called out datums?

Thank you guys!

Parents

Nano Vujkovic over 9 years ago

Ø is a symbol for dimeter

FCFLOC2 =POSITION : DATUM_B
            FEATCTRLFRAME/SHOWNOMS=NO,SHOWPARAMS=YES,SHOWEXPANDED=YES
            CADGRAPH=OFF,REPORTGRAPH=OFF,TEXT=OFF,MULT=10.00,ARROWDENSITY=100,OUTPUT=BOTH,UNITS=IN
            COMPOSITE=NO,FIT TO DATUMS=YES,DEV PERPEN CENTERLINE=ON,OUTPUT ALIGNMENT=Datum Reference Frame
            CUSTOMIZED DRF=NO
            STANDARDTYPE=ASME_Y14_5
              SIZE TOLERANCES/1,DIAMETER,2.0866,0.0018,0
              PRIMARY DIMENSION/POSITION,[B]DIAMETER[/B],0.01,MMC,<PZ>,<len>,C,A,MMC,<size>,<dat>
              SECONDARY DIMENSION/<Dim>,<tol>,<MC>,<dat>,<dat>,<dat>
              NOTE/FCFLOC2
            FEATURES/DATUM_B,,

Reply

Nano Vujkovic over 9 years ago

Ø is a symbol for dimeter

FCFLOC2 =POSITION : DATUM_B
            FEATCTRLFRAME/SHOWNOMS=NO,SHOWPARAMS=YES,SHOWEXPANDED=YES
            CADGRAPH=OFF,REPORTGRAPH=OFF,TEXT=OFF,MULT=10.00,ARROWDENSITY=100,OUTPUT=BOTH,UNITS=IN
            COMPOSITE=NO,FIT TO DATUMS=YES,DEV PERPEN CENTERLINE=ON,OUTPUT ALIGNMENT=Datum Reference Frame
            CUSTOMIZED DRF=NO
            STANDARDTYPE=ASME_Y14_5
              SIZE TOLERANCES/1,DIAMETER,2.0866,0.0018,0
              PRIMARY DIMENSION/POSITION,[B]DIAMETER[/B],0.01,MMC,<PZ>,<len>,C,A,MMC,<size>,<dat>
              SECONDARY DIMENSION/<Dim>,<tol>,<MC>,<dat>,<dat>,<dat>
              NOTE/FCFLOC2
            FEATURES/DATUM_B,,

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