Position tolerance between planes is strange...

[[Ka...]]

Dear Experts,

Using CALYPSO 7.4.24 🙂

We have two planes with a nominal Distance of 0.7mm. The drawing specifies a position tolerance between the planes, which is ultimately nothing more than the simple distance.

The compensation method is standard Gaussian. However, when I use the ‘M-Distance’ or ‘Plumb’ test element, different distances are output. ‘M-Distance’ or ‘Lot’ deliver similar values using different Filter. 

Position -> E zu C			M-Distanz			Lot
Gauß	0,748		Zentrum Gaus	0,724		Gauß	0,724
Minimum	0,748		Zentrum Minimum	0,719		Minimum	0,719
Innen T	0,639		Zentrum Innen T	0,693		Innen T	0,693
Außen T	0,774		Zentrum Außen T	0,742		Außen T	0,742
			Minimum Gauß	0,638
			Minimum minimum	0,638
			Minimum Innen T	0,638
			Minimum außen T	0,638
			Maximum Gauß	0,786
			Maximum Minimum	0,786
			Maximum Innen T	0,786
			Maximum außen T	0,786

Until now, I assumed that with a position tolerance, the standard is to use the centre of gravity of the reference surface was determined as the point for a perpendicular line to the tolerated surface.

I cannot understand the values output from the position tolerance. How exactly is the distance between two planes determined here? This is complete strange to me..😐

Thank you very much for explaining the phenomenon.
Regards
Karsten
 

[[Ma...]]

I think that TP for plane will be for the furthest point of that plane - not midpoint or origin point.

It works like surface profile or for better understanding - like perpendicularity - it takes either measured points or feature nominal shape ( rectangle ) and reports the furthest point of a corner or measured point from ref. distance.

You can try this out with theoretical planes with setted A1,A2 angles

Edited November 13