Inventor General Discussion

Inventor General Discussion

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Registered: ‎10-18-2012
Post 1 of 27

Can't move unconstrained parts within an assembly

2926 Views, 26 Replies
11-08-2012 08:40 AM

Hi, I have been building an assembly and suddenly I am unable to move parts according to their constraints. I can move them as soon as they are placed but as soon as I add one constraint it's as if they are glued in place. For example, when I line up two holes I can no longer rotate one part around the grounded component.

 

Have a turned off some functionality of the program?

 

Any help would be much appreciated!

 

Ben

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Post 2 of 27

Re: Can't move unconstrained parts within an assembly

11-16-2012 01:50 PM in reply to: ben_walker5

I'm having this same problem, hopefully there is an easy quick fix.

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Post 3 of 27

Re: Can't move unconstrained parts within an assembly

11-18-2012 01:11 PM in reply to: KF090

There should be quite a few threads in this forum over the last several years that discuss this problem.  Unfortunately there is no quick fix-- it seems that Inventor can get confused in certain assemblies, and there is no solution other than deleting a bunch of constraints and starting over.  But do some searching and see if there's any more guidance from people with the benefit of experience.

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Post 4 of 27

Re: Can't move unconstrained parts within an assembly

11-18-2012 03:28 PM in reply to: ben_walker5

Look for a bad constraint, this seems to freeze parts, also having a second part selected in the browser will do the same thing as well.

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Post 5 of 27

Re: Can't move unconstrained parts within an assembly

11-19-2012 01:59 AM in reply to: ben_walker5

do as the others have suggested, but just to get you out of trouble if it needs to go out the door...

 

Although you can not drag the component, you may be able to move it by adding additional constraints, just add them as you would normally would and see if it moves correctly

Stephen Gibson



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Registered: ‎08-15-2011
Post 6 of 27

Re: Can't move unconstrained parts within an assembly

11-21-2012 05:05 AM in reply to: ben_walker5

Hi Ben,

 

Could you attach your assembly? If you have some simple assembly that exhibits the problem I can take a look closer for source of the problem.

 

Thank you,

Robert

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Registered: ‎03-09-2011
Post 7 of 27

Re: Can't move unconstrained parts within an assembly

11-21-2012 11:02 AM in reply to: t_stramr

I have had this issue also, in 2010, 2011, and 2012.  It seems to be related to previously placed parts that are grounded. If I "un ground" parts placed before the one that is messed up it seems to free them up. Then I ground the previously un grounded parts. 

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Post 8 of 27

Re: Can't move unconstrained parts within an assembly

09-10-2013 02:41 AM in reply to: ben_walker5

I have the same problem. And as rjezuit says, try to ungound your parts. Every assembly should have only one part grounded no more than that. Another thing that could be causing this are adaptive sketches and parts. You should always turn the adaptivity off. 

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Post 9 of 27

Re: Can't move unconstrained parts within an assembly

09-10-2013 04:07 AM in reply to: Barvas11

Barvas11 wrote:
.... Every assembly should have only one part grounded no more than that.
...

I often have multiple grounded components (parts or sub-assemblies) within my assemblies.

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Post 10 of 27

Re: Can't move unconstrained parts within an assembly

09-10-2013 04:54 AM in reply to: JDMather

Well that's what we were told by Autodesk employees. I must say that it makes my life much easier because assemblies with high number of grounded parts don't tent to behave as they should.... 

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