Fusion 360 eliminates features while combining bodies

[yuriy.tymchuk]

I have a case when, after combining bodies, features on one of them (line press-pull on a hole and fillet) get eliminated. How does that even happen? I understand that sometimes it's hard to combine bodies, but why a hole (which does not even intersect the other body) changes diameter???

[TheCADWhisperer]

@yuriy.tymchuk 

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

[yuriy.tymchuk]

@TheCADWhisperer  added

[TrippyLighting]

That looks like a bug to me!

@Phil.E 

[Phil.E]

Thanks for calling on me, but when I test the combine feature using the attached model I don't get any strange results. 

Someone else will be looking closely at this file, but for now, just redo the operation again it should be fine.

[jeff_strater]

I'm not sure what is going on here, TBH.  But, I did notice, by trial and error, that Compute All seems to fix whatever it is.  So, while we research the original problem, that should get you going again, @yuriy.tymchuk 

[jeff_strater]

even just editing that one Combine feature seems to fix it.  I have had problems trying to reproduce this problem.  If you come up with a way to do that, we'd appreciate it.  Thanks

[yuriy.tymchuk]

Thank you all. Just one more piece of info: when I did it for the first time, everything was fine. But after I change some parameters, it got into the broken state.

P.S. I know that there are many suboptimal design decisions. But the model changed authors 3 times and each one of us tried to add some really good "improvement"

P.P.S. @jeff_strater thank you for the suggestion to use "Compute All". Today I've learned something new 🙂

[yuriy.tymchuk]

Update #2, after I ran "Compute All" two extrudes on the back side got missing 😂 (and although the middle hinge is constructed by extruding to the missing face, it appears to be completely fine)

[TrippyLighting]

@jeff_strater @Phil.E I did not perform a compute-all as IN my own work I very, very rarely need to do that.

I simply downloaded the model and moved the timeline marker to before and after the combine feature.

[jeff_strater]

We are still investigating this.  There is definitely something strange going on with that model.  I think most times you can get it to work, but yes, there are some strange behaviors that we still need to understand.  Thanks for bringing this to our attention.