topic Re: jointed sub assembles explode automaticaly? in Fusion Support Forum

jointed sub assembles explode automaticaly?

Luke.roberts7B8WE — Fri, 18 Jul 2025 06:42:27 GMT

Hello

I seem to be having a problem when i joint sub assembled together that the parts will automaticaly explode? especialy when changing peramiters

my soloution has been in the past to move a part and ctl - z and it will go back to its correct spot but when using joint i am unable to do this, am i creating the subb assembles wrong? all parts are in component form and i dont have any errors in the timeline?

image 1

Image 2 - Peramiter change

Image 3- drag model slighly and will snap back into place?

Image 4 - components

any help would be much appretiated with this

Kind regards

Luke

Re: jointed sub assembles explode automaticaly?

jhackney1972 — Fri, 18 Jul 2025 11:19:53 GMT

Please attach the affected assembly.

Re: jointed sub assembles explode automaticaly?

Luke.roberts7B8WE — Fri, 18 Jul 2025 11:24:48 GMT

Hello

Please see attached f3d file op the model

Kind regards

Luke

Re: jointed sub assembles explode automaticaly?

g-andresen — Fri, 18 Jul 2025 12:23:54 GMT

Hi,

@Luke.roberts7B8WE schrieb:

Please see attached f3d file op the model

Where?

günther

Re: jointed sub assembles explode automaticaly?

Luke.roberts7B8WE — Fri, 18 Jul 2025 12:25:51 GMT

Sorry, Please see attatched

Re: jointed sub assembles explode automaticaly?

Luke.roberts7B8WE — Thu, 24 Jul 2025 06:18:37 GMT

Hi @g-andresen,

can you see any problems with the way we are constructing the parts at all that is casuing this to happen? i find if i joint parts then do an exact copy it tends to do this a lot?

Kind regards

Luke

Re: jointed sub assembles explode automaticaly?

davebYYPCU — Thu, 24 Jul 2025 10:04:43 GMT

Partial review of your file, yes, I got a displaced display you showed, just walking up and down the timeline, Compute All fixed it.

You do seem to be using Rule 1, but it's organized chaos at this point in the Timeline.

Further down the timeline, you are adding extrudes to the posts, to change the length, when Edit Feature can do it more efficiently.

You have too many Capture Positions, and after Joints they should be deleted, they consume a lot of processing time.

no Component Patterns?

What parameter changes are you trying to do? There are only 2 User Parameters, and neither appear to be used.

Happy to help but need some clues of what is not working for you.

What are you expecting to output from your model?

Might help...

Re: jointed sub assembles explode automaticaly?

Luke.roberts7B8WE — Thu, 24 Jul 2025 10:49:21 GMT

Hi @davebYYPCU Thank you very much for your response! the compute all tool works really well and looks like it has solved the issue!

Yeah this is a old model of ours and we do eddit features more as opposed to over extruding parts now but thank you for spotting that.

I used to use the pattern tool but found that this casued parts to explode more and tried going to joining parts individualy but now the compute tool has solved this issue i will revert back to pattening components again and then doing a rigid group After the componant is made.

For this particular model it was mainly the Total Width Peramiter but this model is mainly used as an example for the issue we had which i belive you have solved it 🙂 what i am trying to do going forwrad is to create more models that are peramiter driven which wouldnt explode every time we change a perimter and for me its just a better understaing of why these thing happen

Thanks again for looking into this for me, a really big help!

Kind regards

Luke

Re: jointed sub assembles explode automaticaly?

davebYYPCU — Thu, 24 Jul 2025 11:45:03 GMT

Well, then, models that explode on parameter changes are doing so, because they are not using required (virtual chain) links for the changes to flow through the model.

An assembly like this - make one of each individual component. Joint each original component as required. Once the duplicates are patterned correctly, Rigid Group the finished product.

Use of a User Parameter for the roof angle, would flow through to all the components that use the angle. (Each time the angle is made you use the angle parameter for it)

Might help...