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Distinguished Contributor
Posts: 153
Registered: ‎03-20-2003
Message 1 of 14 (2,043 Views)

Strange Assembly behavior - parts won't move that are not fully constrained

2043 Views, 13 Replies
11-06-2008 09:02 AM
Can someone at Autodesk take a look at a pack n go? This assembly has piping parts that are not filly constrained yet will not move. For example a Tee that has only its centerline mated to a pipe centerline acts like it is fully constrained or grounded. I can demote those parts into a sub-assembly and then they behave normally. I'm wondering if this assembly has some kind of bug, even though no errors are reported and rebuild all doesn't help. Is there any kind of other program that goes through an assembly file and cleans up bugs? Any help would be appreciated. The pack n go is 65 MB so someone will need to tell me where I can send it.
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Message 2 of 14 (2,043 Views)

Re: Strange Assembly behavior - parts won't move that are not fully constrained

11-06-2008 09:06 AM in reply to: fourholesn1
Just curious. Do you have the LeaCar addin installed?
Distinguished Contributor
Posts: 153
Registered: ‎03-20-2003
Message 3 of 14 (2,043 Views)

Re: Strange Assembly behavior - parts won't move that are not fully constrained

11-06-2008 09:09 AM in reply to: fourholesn1
I guess not....don't see anything like that in my add-in list.
*Blair Stunder
Message 4 of 14 (2,043 Views)

Re: Strange Assembly behavior - parts won't move that are not fully constrained

11-06-2008 01:00 PM in reply to: fourholesn1

If your assembly has IPT files that are not
properly constrained, you will have this problem.


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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
I
guess not....don't see anything like that in my add-in
list.
Distinguished Contributor
Posts: 153
Registered: ‎03-20-2003
Message 5 of 14 (2,043 Views)

Re: Strange Assembly behavior - parts won't move that are not fully constrained

11-06-2008 01:32 PM in reply to: fourholesn1
What is the definition of "not properly constrained"? Surely you can insert a part and not have it be FULLY constrained so that it may be free to move in one direction.
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Message 6 of 14 (2,043 Views)

Re: Strange Assembly behavior - parts won't move that are not fully constrained

11-06-2008 01:54 PM in reply to: fourholesn1
I suspect parts can be built without any dimensions and/or constraints and the assembly constraints will work just fine. You problably have something wrong in your assembly constraints or adaptivity between parts.
I'll bet the problem could be reduced to a handful of parts (probably just two) within the assembly.
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*Blair Stunder
Message 7 of 14 (2,043 Views)

Re: Strange Assembly behavior - parts won't move that are not fully constrained

11-06-2008 02:21 PM in reply to: fourholesn1

Don't ask me why, but a loosely constrained IAM
file will do this. I ussually start looking at all my IPT's to see which one is
not properly constained.


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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
I
suspect parts can be built without any dimensions and/or constraints and the
assembly constraints will work just fine. You problably have something wrong
in your assembly constraints or adaptivity between parts. I'll bet the problem
could be reduced to a handful of parts (probably just two) within the
assembly.
Distinguished Contributor
Posts: 153
Registered: ‎03-20-2003
Message 8 of 14 (2,043 Views)

Re: Strange Assembly behavior - parts won't move that are not fully constrained

11-06-2008 06:12 PM in reply to: fourholesn1
I'll talk to the user but I think he does have quite a few partially constrained parts. I'll ask him to constrain everything and see what happens. I have to say though, I think Autodesk should address this. In this design situation (piping runs) I think partially constrained parts makes sense.
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Posts: 133
Registered: ‎09-22-2005
Message 9 of 14 (2,043 Views)

Re: Strange Assembly behavior - parts won't move that are not fully constrained

11-07-2008 08:59 AM in reply to: fourholesn1
Can you send a sample iam file with all your ipt files and indicator which part has problem when you has one constrain? You can send them directly to me at lisa.den@autodesk.com

I will let you know what I find after I take look the files.

Thanks.

Lisa Den (Autodesk)
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Message 10 of 14 (2,043 Views)

Re: Strange Assembly behavior - parts won't move that are not fully constrained

11-07-2008 11:21 AM in reply to: fourholesn1
The problem is to many things are partially constrained. Inventor has to try and figure out how to many things can move and gets bogged down.
Once you get a part of the run settled, try constraining whatever you can. Or, an easier way is to ground things that don't affect what you are working on right now. Sometimes just grounding one part is enough, if it locks down most of the parts the ones you need to work with will behave properly.

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