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Valued Contributor
ninjajedisaiyan
Posts: 65
Registered: ‎04-28-2009
Message 1 of 6 (862 Views)

Subassembly constraints constantly need rebuilding

862 Views, 5 Replies
06-05-2012 12:12 PM

I'm working in a large top level assembly and the following is happening

1. Assembly is happy with no broken constraints

2. Edit a constraint (in this case, to rotate a part based on an angular constraint with another part)
3. Error message pops up telling me dozens of constraints in subassemblies are broken
4. Click Accept, assembly does not visually update

5. Click "Rebuild All" button under manage tab
6. 3 minutes later the model is updated, everything is happy, model looks how it should.

 

This type of problem has been happening lots to different assemblies with difference constraint scenarios.

 

 

Inventor 2013

W7 x64

*Expert Elite*
Curtis_Waguespack
Posts: 2,780
Registered: ‎03-08-2006
Message 2 of 6 (860 Views)

Re: Subassembly constraints constantly need rebuilding

06-05-2012 12:17 PM in reply to: ninjajedisaiyan

Hi ninjajedisaiyan, 

 

Do you happen to have some adaptive cross part geometry in the assembly. It could be that you've created a situation where Inventor is chasing it's tail a bit (trying to update one part, that then needs to update another, and on and on).

 

If you toggle the Adaptive option off for any Adaptive parts do you still see the issue?

 

I hope this helps.
Best of luck to you in all of your Inventor pursuits,
Curtis
http://inventortrenches.blogspot.com




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Valued Contributor
ninjajedisaiyan
Posts: 65
Registered: ‎04-28-2009
Message 3 of 6 (857 Views)

Re: Subassembly constraints constantly need rebuilding

06-05-2012 12:22 PM in reply to: Curtis_Waguespack

No, we try to avoid creating adaptive parts at all costs because we have always found as much that can be helpful and tempting to use, it creates more problems that it's worth in the long run.

 

Also I forgot to mention I do NOT have "defer updates" checked in App. Options.

*Expert Elite*
Curtis_Waguespack
Posts: 2,780
Registered: ‎03-08-2006
Message 4 of 6 (851 Views)

Re: Subassembly constraints constantly need rebuilding

06-05-2012 12:27 PM in reply to: ninjajedisaiyan

Hi ninjajedisaiyan,

 

hmmm, what if you go to the Tools tab > Application Options button > Assembly tab, and enable the "Enable constraint redundancy analysis" option and/or the "Enable related constraint failure analysis"

 

 

Enable constraint redundancy analysis

Specifies if Autodesk Inventor analyzes all assembly components for adaptivity adjustments. Default setting is not selected.

Not selected

When the check box is cleared, Autodesk Inventor skips a secondary analysis which normally checks for redundant constraints and analyzes all component degrees of freedom. The system only updates degree of freedom analysis when the symbols are displayed.

Selected

When the check box is selected, Autodesk Inventor performs a secondary analysis, and notifies you when redundant constraints exist. Degrees of freedom are updated, even when they are not displayed.

 

Enable related constraint failure analysis

Specifies if Autodesk Inventor performs an analysis to identify all affected constraints and components if constraints fail. Default setting is selected.

Not selected

When the check box is cleared, Autodesk Inventor does not perform the analysis.

Selected

When the check box is selected, Autodesk Inventor performs an analysis to identify all affected constraints and components if constraints fail.

After analysis, you can isolate the components that use the constraints and select a treatment for individual components,

 

 

You don't typically what to leave these enabled, but they might help you determine the present issue.

 

I hope this helps.
Best of luck to you in all of your Inventor pursuits,
Curtis
http://inventortrenches.blogspot.com




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Valued Contributor
ninjajedisaiyan
Posts: 65
Registered: ‎04-28-2009
Message 5 of 6 (837 Views)

Re: Subassembly constraints constantly need rebuilding

06-05-2012 01:36 PM in reply to: Curtis_Waguespack

No those didn't help

Valued Contributor
ninjajedisaiyan
Posts: 65
Registered: ‎04-28-2009
Message 6 of 6 (828 Views)

Re: Subassembly constraints constantly need rebuilding

06-05-2012 02:13 PM in reply to: ninjajedisaiyan

I may have gotten my assembly working and I messed with a lot of stuff so I can't confirm 100% that this was my problem but I am very suspicious it was the limit constraints I had in a few subassemblies.  I had a few flexible hydraulic cylinder subassemblies with the stroke defined by an insert constraint with limits and once I changed that to just a mate constraint to the axis' (unconstrained otherwise) my problems started clearing up.

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