Inventor General Discussion

Posts: 4
Registered: ‎10-20-2011
Message 1 of 3 (227 Views)

Parametrized elbow

227 Views, 2 Replies
08-10-2012 01:25 AM

I have an elbow parameterized with sheet metal parts and structure.


The assembly is based on a parameterized skeleton, in which one of the parameters is the angle.


To create the structure of one end of the elbow, the edges of the skeleton use as reference. (elbow_45.jpg)

The problem arises when the value of the angle change, as some of the frame component are misaligned (elbow_90.jpg).


I know there is a version solicion in 2013, but I'm working on the 2012. Anyone know of any alternative solution?



*Expert Elite*
Posts: 1,077
Registered: ‎09-03-2008
Message 2 of 3 (189 Views)

Re: Parametrized elbow

08-10-2012 08:10 AM in reply to: jgaston

Can you post your assemly and parts in a zip file?  It's hard to know exactly what is happening here without seeing the model.


I'll venture a guess that some assembly constraints are the cause of the trouble.  Is the problem only with the two support angles that are on the curved faces?  How did you constrain them to your skeleton?  Edge to edge?

Posts: 2,229
Registered: ‎04-30-2008
Message 3 of 3 (158 Views)

Re: Parametrized elbow

08-10-2012 02:46 PM in reply to: jgaston

Hi! If I understand this issue correctly, it is about the frame members misalign when reference source geometry tranforms in the model space. This is a known limitation in R2012 unfortunately. The issue here is that the frame member is not aware of the alignment. When the reference part changes shape resulting in relocating the frames, the frame alignment may not adjust accordingly.

In R2013, Frame Generator provides Align option. If a member is edited, you can pick an alignment reference (plane or edge). Then as long as the alignment reference geometry exists, the frame should align accordingly.



Johnson Shiue (
Principal SQA Engineer, Inventor
Mechanical Design
Autodesk, Inc.

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