Complex model explodes with cntrl+b and when updating out-of-date references

[JulienMott]

Hi, a complex model of mine with complex dependencies (dependencies w/ dependencies) explodes when I compute it or when I update out-of-date references. There has been signs of something wrong for a while. I kept getting these warnings when updating references saying I had to scroll back on the timeline to update---however, I could save it as normal to correct this. Just weirdness. Anyway, I altered a dependency for a model that goes into my main model, and this caused a downstream feature failure. It had to do with changing the length of some bolts then redoing the joints in the same place. Because of this issue I went back to version one of the bolts, which became version three because I was saving the bolts again. However, despite the bolts being identical to the ones in my cads, I had to update the bolt references. I felt like this shouldn't happen but it did. When I updated the bolts, everything exploded again. Then I tried computing all which also exploded everything with like 150 errors. Super weird stuff. I have probably sixty+ hours on this project so I hope I can fix it. Currently I can't update references without sudden combustion. 

[Rafal.Chlod · Accepted solution]

Hi @JulienMott, thanks for posting.

Running "Compute All" on the design shows errors/warnings in the timeline that suggest inconsistencies in the design which may not have seen beforehand. The positions of the components are recalculating and that is the cause of the assembly "explosion".

Maybe I'm wrong, but I am afraid that there is no other way to repair your assembly than rebuild corrupted joints in the last functional version of it.

1. Open one of previous versions (without relocated components) of an assembly.
2. Find first corrupted joint on the timeline.
3. Right-click on joint icon and choose Roll History Marker Here.
4. Find the feature in Browser.
5. Edit broken joint.
6. Repeat operation on all corrupted features.

To avoid these error messages I would recommend using the "Compute all" option regularly while creating an assembly. I think you may also find this article helpful: Resolving Timeline Warning or Errors in Fusion 360.

What is more, I can also recommend to check this article: Large Design Management in Fusion 360.