Not all the class can be subclassed with python. Did you try to create a Part::FeaturePython + your coordinatesystem object and then link the coordinate to the FeaturePython object ? It's been a long time since I the freecad python api so I could be wrong. https://wiki.freecadweb.org/FeaturePython_C...

Hi,

Try adding self.Object = obj or obj.Proxy = self in the _init__ function as per documentation recommandation.

https://wiki.freecadweb.org/Scripted_ob ... attributes
https://wiki.freecad.org/FeaturePython_methods

About the App::PropertyLinkSubList, did you check those links:
https://forum.freecadweb.org/viewtopic.php?t=37288
https://wiki.freecadweb.org/LinkSubList

Could you provide an access to your wip workbench ? I would like to take a look if I have some time. For the question related to the orientation, it was mfasano who worked on it. So without check the code I can't tel you who it is done. For the modal join yes it could be a nice feature. The problem,...

Hi, Maybe add obj.Proxy = self in the onDocumentRestored method. ( https://wiki.freecadweb.org/FeaturePython_methods ) And for the onChanged method a simpler way to do it could be by changing the obj.type strings as follow (add the curly bracket "{" and "}"] to replace each {vari...

I think I spotted this problem when i was working on the other workbench but did not continue to investigate due to all major task I had. Maybe be overwriting one of the following methods you could reattribute the unit to each object? OnDocumentRestore __setstate__ Or maybe the __getstate__ method t...

Hi Jose,

I found this thread, maybe it can help you.
https://www.forum.freecadweb.org/viewto ... 10&t=47992

Isn't the model overconstrained ? If so, the solver can't handle it. You have to change some joint or add regularization joint (I don't know who they work)

josegegas wrote: ↑Tue Feb 09, 2021 5:40 pm I agree with you, the key problem may be rounding+tolerances. Have you played with the "initial position stiffness" variable of mbdyn?

No I didn't.

Can you share the input files of the V2 engine (the handmade one and the one created woth your workbench ?)

For the rounding of the numbers, i developped a tab in the preferences gui of the mbdyn workbench developped by Matt and myself that allow the user to defined the format of the numbers (exponential, floating + number of decimals) I also spotted the same behavior on some simple simulation I did. It i...