【转帖】TP measurement - can someone explain this to me?

cad13992

can someone explain this to me?

Code:
DIM LOC1= TRUE POSITION OF CIRCLE CIR7  UNITS=MM ,$GRAPH=OFF  TEXT=OFF  MULT=10.00  OUTPUT=BOTH  FIT TO DATUMS=OFF  DEV PERPEN CENTERLINE=OFF  DISPLAY=DIAMETERAX    NOMINAL       +TOL       -TOL      BONUS       MEAS        DEV     OUTTOLX     145.300                                     145.899      0.599           Y       0.000                                       0.017      0.017           DF     57.200      0.500      0.500                57.745      0.545      0.045 ------->TP        RFS      0.500                 0.000                 1.198      0.698 ------->END OF DIMENSION LOC1

TP measurement is exactly twice the X value measurement. It's like that on every one of these parts I check.

cad13992

OK, lets see, in the instance you posted, that IS how it works out:

2 X SQRT(.599^2+.017^2) = 1.1984

and when rounding to 3 places, 1.198 so it is correct

Idea #2: are the correct axis being displayed? Does this hole have a 0,0,1 (or close) vector?

0.017 in the formula gives less than 0.0005 additional TP deviation, so in the one you are showing, it IS correct.