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Cad models to nominal or to print

browningdmis
So to those that draw models. Do you build them to print tolerance exactly or do you build them to nominal?
example a hole that is 1" plus .004 minus 0. Do you build the model so it's 1.002" or per the print 1" plus .004 minus 0? If you build to nominal is that affecting your pcdmis program?
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  • Build it at nominal !!! YOu can adjust CMM prg easy if needed. More importaint that the CNC ( or mold or whatever) is shooting for the bullseye !
  • in reply to Schlag
    it is too bad that you can't choose (in Pcdmis) how to display the tolerance limits. Maybe you can in newer versions, but simply getting the +/- values (in this case, +0.004/-0.000) it what the main issue is with the unilateral tolerance of hole sizes (and maybe in other cases as well).

    It would be nice to be able to have the report show: 
    DIM DH009= TRUE POSITION OF CIRCLE H009  UNITS=MM ,$
GRAPH=OFF  TEXT=OFF  MULT=1.00  OUTPUT=BOTH  DEV PERPEN CENTERLINE=OFF  DISPLAY=DIAMETER
AX   NOMINAL     +TOL       -TOL       BONUS      MEAS        DEV      OUTTOL   
X    5908.354                                    5908.354      0.000           
Z     862.800                                     862.800      0.000           
DF     16.000     16.500     15.500      0.500     16.000      0.000      0.000 ----#----
TP        MMC      2.000                 0.500                 0.000      0.000 #--------
END OF DIMENSION DH009

    instead of 
    DIM DH009= TRUE POSITION OF CIRCLE H009  UNITS=MM ,$
GRAPH=OFF  TEXT=OFF  MULT=1.00  OUTPUT=BOTH  DEV PERPEN CENTERLINE=OFF  DISPLAY=DIAMETER
AX   NOMINAL     +TOL       -TOL       BONUS      MEAS        DEV      OUTTOL   
X    5908.354                                    5908.354      0.000           
Z     862.800                                     862.800      0.000           
DF     16.000      0.500      0.500      0.500     16.000      0.000      0.000 ----#----
TP        MMC      2.000                 0.500                 0.000      0.000 #--------
END OF DIMENSION DH009
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  • in reply to Schlag
    it is too bad that you can't choose (in Pcdmis) how to display the tolerance limits. Maybe you can in newer versions, but simply getting the +/- values (in this case, +0.004/-0.000) it what the main issue is with the unilateral tolerance of hole sizes (and maybe in other cases as well).

    It would be nice to be able to have the report show: 
    DIM DH009= TRUE POSITION OF CIRCLE H009  UNITS=MM ,$
GRAPH=OFF  TEXT=OFF  MULT=1.00  OUTPUT=BOTH  DEV PERPEN CENTERLINE=OFF  DISPLAY=DIAMETER
AX   NOMINAL     +TOL       -TOL       BONUS      MEAS        DEV      OUTTOL   
X    5908.354                                    5908.354      0.000           
Z     862.800                                     862.800      0.000           
DF     16.000     16.500     15.500      0.500     16.000      0.000      0.000 ----#----
TP        MMC      2.000                 0.500                 0.000      0.000 #--------
END OF DIMENSION DH009

    instead of 
    DIM DH009= TRUE POSITION OF CIRCLE H009  UNITS=MM ,$
GRAPH=OFF  TEXT=OFF  MULT=1.00  OUTPUT=BOTH  DEV PERPEN CENTERLINE=OFF  DISPLAY=DIAMETER
AX   NOMINAL     +TOL       -TOL       BONUS      MEAS        DEV      OUTTOL   
X    5908.354                                    5908.354      0.000           
Z     862.800                                     862.800      0.000           
DF     16.000      0.500      0.500      0.500     16.000      0.000      0.000 ----#----
TP        MMC      2.000                 0.500                 0.000      0.000 #--------
END OF DIMENSION DH009
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