Inaccurate dimension after extrude and export as step

[arnavbiswas79]

Hi,
I designed an axial flux motor and wanted to simulate the model in Altair, to save simulation time I had only designed 1/4th of the motor but when I imported the step file from fusion 360 to Altair I was facing issues with the position of the end points.

I multiple times tried to edit and verify the sketch and my sketch was fully constrained yet there were problems.

Earlier I though there must be some import/export error. The file must be not suitable for cross platform use.
When I opened the fusion generated Step file on notepad, I found the the position of the points where it should have been 0.0 the points were not 0.0 instead they were something like 8.32374283498E-16. Hence, the points were not exactly 0 but approximately 0 and this is causing many problems in my simulation. I am unable to generate symmetry in the model.
Fusion 360 was very disappointing in this regard and finally I designed the same model in Solid works and it works fine.

These are the point errors that I am getting by Exporting the file as a STEP file

As you can see the sketch that I made is fully constrained and yet the corner points are not at the coordinate (0,0,25)

Errors such as these are unacceptable, fuison has extremely powerful tools and workflow is really fast but with such problems I will have to permanently stop using fusion.  

[jeff_strater]

This is below the level which can be measured in the real world.  All CAD systems use a tolerance to compute geometry (without that, some operations would take a VERY long time to complete).  These levels of geometry differences should be expected.

[hamid.sh.]

Can you share the model (export to *.f3d) and post it here?

[hamid.sh.]

Looking into the number you mention I totally agree with @jeff_strater This is just a tolerance, not inaccuracy, and not important in real world. I mean 8E-16 mm is like 1/150,000,000 width of a hydrogen atom! To prove the point I also looked into my old STEP files generated by SolidWorks and saw such numbers occur quite frequently:

The problem you see in Altair has a different origin.

[arnavbiswas79]

I have written the message hoping the problem will be acknowledged. I was facing problems during the simulation in Altair. If the tolerance was really acceptable I would never have checked the position of the points or opened the STEP file in the notepad. If this is the case with every software why did I not face a similar problem with the model imported from Solid Works? Why does the step file exported from Solid Works show exact 0s instead of some approximation?I understand if I design the part and then export it for manufacturing I will not face a problem, as mentioned by Mr. Jeff this is actually an insignificant number in real world but the case of simulation is different. Those are based on mathematical equations and there is a difference between being exactly 0 and approximately 0. For example 1/0 is an undefined number whereas 1/8E-16 is some number, equations don't understand tolerances. And the problems I was facing in Altair that I could see multiple edges and overlaps and even after Altair corrected the minor overlaps there were still some problems.The point being I have faced problems with this software and not other software. 
Perhaps the reason I haven't faced the same problem with Solid Works is because I used 2022 version and they have solved their problems since 2016.
I can not share the exact model as it is a part of research project. Although I have share a similar model which has same problems.
I have experienced fusion do some weird things when I have used circular pattern feature in a sketch whereas it works fine when a circular pattern is used on a body or a feature. 
I would really appreciate it if my problems could be shared with the developers because this is actually something very basic.

[TheCADWhisperer]

@arnavbiswas79 

Please attach the *.sldprt replication of the issue for diagnosis.