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DimXpert and assumed geometric tolerances

Question asked by Alessandro Tornincasa on Mar 30, 2016
Latest reply on Apr 9, 2016 by Alessandro Tornincasa


I have a question about a DimXpert behaviour that is undocumented, ora maybe I'm simply unable to find any pertaining documentation.

I've created datum A on my flat part, why does DimXpert tolerance status mark the surface as totally defined ?

Reference A.PNG

As far as I know, a flatness tolerance would be required for that surface in order to have it fully defined.

Infact, if I don't apply a datum, but instead I manually create a flatness tolerance, the surface is marked fully defined (as expected):



Does DimXpert assume that a surface has a Flatness tolerance when you create a datum on a planar surface ?

Could be the case if we think about ISO standard and general geoemetric tolerance.

But what confuses me is that if you use autodimension scheme with only that surface as primary reference, SOLIDWORKS puts a flatness tolerance:



So what does DimXpert assume when you put a datum on a planar surface ?