Plane "thickness" : bug or miscomprehension ?

[JEFMAN]

I was trying to solve the thread https://www.pcdmisforum.com/forum/pc...surface-levels by using the "measured thickness box" in an auto plane.
The theo and actual values of the plane are different than the target value (what it was expected), but the actual hit values are not shifted of the thickness value.
Is it normal ?
For example (because I'm really not sure to be clear !) if you program an auto-plane at Z=0 with a measured thickness of 10, the actual and theo Z values of the plane are 10, the target is Z 0, and the hits values are Z 0.
An enhancement could be to choose if the hits can be shifted or not...

[Matthew D. Hoedeman]

It will depend on WHICH thickness you use. ACTL THICKNESS will not change THEO values and it will report AS IF there were no thickness used even though it measures using the thickness and uses the thickness to adjust the result BY the thickness. As in, Z THEO of 0, ACTL THICK of 10, it will measure AS IF the theo was 10, it will report the hits AS IF there were no thickness. It is this way so that you get a common nominal no matter what the thickness is (for a variable part). THEO THICKNESS will shift all nominals by the thickness and it will report it as such. As in, Z THEO will now be 10 (for this example) and the report will be 10 nominal.

[JEFMAN]

Tested offline, actual thickness cahnge theo and actual, theo thickness change theo, actual and target.
I would like to use it when a plane datum is constructed from different plane at different heights...

[Matthew D. Hoedeman]

well, I don't USE planes, but for vector/surface/edge/circle/slot, that is how it works. Typed in X0Y0Z0, the used THEO of 10, then removed it, used ACTL of 10.

P001       =AUTO/VECTOR POINT,SHOWALLPARAMS = YES
            THEO/0,0,10,0,0,1
            ACTL/0,0,10,0,0,1
            TARG/0,0,10,0,0,1
            THEO_THICKNESS = 10,RECT,SNAP = NO,$
            AUTO MOVE = NO,DISTANCE = 7
DIM D001= LOCATION OF POINT P001  UNITS=MM ,$
GRAPH=OFF  TEXT=OFF  MULT=1.00  OUTPUT=BOTH
AX   NOMINAL     +TOL       -TOL       MEAS        DEV      OUTTOL   
X       0.000      0.000      0.000      0.000      0.000      0.000 ----#----
Y       0.000      0.000      0.000      0.000      0.000      0.000 ----#----
Z      10.000      0.000      0.000     10.000      0.000      0.000 ----#----
T       0.000      0.000      0.000      0.000      0.000      0.000 ----#----
END OF DIMENSION D001
P002       =AUTO/VECTOR POINT,SHOWALLPARAMS = YES
            THEO/0,0,0,0,0,1
            ACTL/0,0,0,0,0,1
            TARG/0,0,10,0,0,1
            ACTL_THICKNESS = 10,RECT,SNAP = NO,$
            AUTO MOVE = NO,DISTANCE = 7
DIM D002= LOCATION OF POINT P002  UNITS=MM ,$
GRAPH=OFF  TEXT=OFF  MULT=1.00  OUTPUT=BOTH
AX   NOMINAL     +TOL       -TOL       MEAS        DEV      OUTTOL   
X       0.000      0.000      0.000      0.000      0.000      0.000 ----#----
Y       0.000      0.000      0.000      0.000      0.000      0.000 ----#----
Z       0.000      0.000      0.000      0.000      0.000      0.000 ----#----
T       0.000      0.000      0.000      0.000      0.000      0.000 ----#----
END OF DIMENSION D002

[AndersI]

I would like to use it when a plane datum is constructed from different plane at different heights...

No, you don't. There's the construction "offset plane" for a reason...

[JEFMAN]

No, you don't. There's the construction "offset plane" for a reason...

I know, but offset plane shifts the feature, not the hits !!!!! (the flatness of a offset plane is zero !)
I was just thinking about this way to construct a datum with different height planes...

Hey, Anders, it's tuesday today...
Is this the great day for you ?

Have a nice retirement, and please continue to be present here, time to time...

[AndersI]

Yes, now it's only hours left...