Persitent Crashes when Editing sketches with splines

[alexander_bastidas_fry]

I use fusion 360 and I get several dozen of crashes a day on my Windows 10 machine as well as a Mac M2 Pro machine.

Primarily the issues arise from editing sketches with splines. Common issues are:
* Fusion freezes when deleting splines which are mirrored or patterned.
* Fusion freezes or crashes when applying constraints.
* The sketches palette dialog (with the finish sketch button) disappears when editing sketch.
* Each line drawn takes minutes to compute, fusion is unusable, or fusion crashes.

I've send in perhaps 300 or so error reports and never gotten a response and so I stopped my subscription. I was a subscriber and I would like to subscribe again. Are these common problems I get dozens of crashes each session.

For example in this file I can't draw another spline off the construction line without fusion crashing.

I would like an expert or support agent to get on a video call with me. Or maybe someone in the forum can tell me, is something wrong with the sketch I have here?


P.S. The first thing you might say is "wrong" with the sketch is that it is unconstrained. When I try and constrain the origin to the sketch to the origin fusion crashes, so yeah...

[davebYYPCU]

* Fusion freezes when deleting splines which are mirrored or patterned.

* Fusion freezes or crashes when applying constraints.

Not surprising, but new unlocked spline works as expected.

That sketch is full "locked" (green articles)  

That sketch has huge number of Mirror icons.

That sketch has a circular pattern.

That sketch is calculating every profile, again with each edit.

Both are not recommended, as demoed by your complaint.

Might help...

[alexander_bastidas_fry]

Could you please elaborate further on how to fix this issue.

The locked points were only for this demo; the error occurs regardless of whether they are locked or not. I understand that this may not be recommended perhaps, but this is just a small demo of what I am creating. Splines and mirrored patterns are what I am creating and they are indeed supported functionality of autodesk fusion therefore I don't think that the program crashing when using them is normal?

Is there a workflow that you recommend for solving this? Note that the drawing is not perfectly symmetric, there are difference in the pattern. Is there a way to stop fusion from recalculating every profile with every edit?

[TrippyLighting]

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@alexander_bastidas_fry wrote:

... and they are indeed supported functionality of autodesk fusion therefore I don't think that the program crashing when using them is normal?

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No software should ever crash. Mirroring and patterning large quantities of sketch objects is not recommended and almost always results in bad sketch and overall model performance. That is unlikely to change any time soon.

I am not sure where you find lack of symmetry.

The small section I have extruded is mirror symmetric:

And then rotational symmetry is created with a circular pattern, which coincides with all the sketch elements:

So for this object, the only thing you'd need in the sketch is 1/12th of the sketch objects. That will make a huge performance difference.

Then, it might make sense not too import questionable svg files, but to use Fusions native tools with proper constraints. 

[alexander_bastidas_fry]

Thanks for that confirmation.

This file may be symmetric perhaps, but in my production work it's 4 bodies that are not symmetric and circular mirroring after design leads to a workflow of clicking on hundreds of subregions to extruded properly that is error prone and I digress...

Would I be better off if I drew the splines 100% in fusion (I think that I did, but I referenced a svg)? How did you know they are imported?

So I can try to adapt to trying to do all design first before mirroring and pattering. However, in that workflow I still need to mirror and pattern occasionally to see progress, but when I do that and then attempt to delete the splines fusion crashes. Is there a way to prevent that crashing when deleting multiple mirrored splines?

[TrippyLighting · Accepted solution]

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@alexander_bastidas_fry wrote:

Thanks for that confirmation.

This file may be symmetric perhaps, but in my production work it's 4 bodies that are not symmetric and circular mirroring after design leads to a workflow of clicking on hundreds of subregions to extruded properly that is error prone and I digress...

If you are looking for 3D geometry, there is no way around that ...

If you're not looking for 3D geometry, then you're working with the wrong software 😉

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@alexander_bastidas_fry wrote:

...

Would I be better off if I drew the splines 100% in fusion .

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Yes, but don't mirror fit point splines.!

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@alexander_bastidas_fry wrote:

...(I think that I did, but I referenced a svg)? How did you know they are imported?

...

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There are many end-connected curves that don't have any tangency constraints applied. That often results in near-tangency problems when 3D modeling. This is a very common occurrence with imported svg files, because the originating software doesn't need the precision required by Fusion. 

Again, don't mirror fit point splines. If you edit a mirrored fit point spline it will lose it's symmetry.  

If you must mirror a fit point spline, then do that after completing all edits on that spline.

If you can record such a crashing incident (I use OBS Studio) and provide the crash report number and the Fusion file, I'll tag an AD employee to record the issue so we can get that fixed.