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Distinguished Contributor
moto748
Posts: 173
Registered: ‎04-27-2004
Message 1 of 10 (334 Views)

Degree of freedom analysis

334 Views, 9 Replies
12-24-2010 02:20 AM

In Inventor 2011. Such a good idea, you can check after completing an assembly/weldment that all parts are correctly constrained, but is it just me, or is it a bit rubbish? It appears to give a lot of false negatives, and often seems to say that parts are under-constrained when they are not.

 

For one thing, it seems unable to cope with patterns. I could live with that, but it's not just patterns. On one weldment I created recently in particular, it claimed nearly every part was under-constrained. One reason I can think of is that the bulk of this weldment was created in Frame Generator, with additional parts added in later with conventional constraints.

 

Any comments, guys?

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JDMather
Posts: 26,257
Registered: ‎04-20-2006
Message 2 of 10 (301 Views)

Re: Degree of freedom analysis

12-26-2010 03:35 AM in reply to: moto748

moto748 wrote:

 

Any comments, guys?


I know when my parts are properly constrained without asking the software if I am doing my job.

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Distinguished Contributor
moto748
Posts: 173
Registered: ‎04-27-2004
Message 3 of 10 (296 Views)

Re: Degree of freedom analysis

12-26-2010 04:43 AM in reply to: moto748

And a Happy Christmas to you too, JD! :smileyhappy:

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JDMather
Posts: 26,257
Registered: ‎04-20-2006
Message 4 of 10 (293 Views)

Re: Degree of freedom analysis

12-26-2010 05:16 AM in reply to: moto748

moto748 wrote:

And a Happy Christmas to you too, JD! :smileyhappy:


I suspect that many of the "automatic" tools they put in Inventor are "pretty wrapped presents" for canned VAR presentations that no one (with experience) actually tries to use in production.  Autodesk isn't alone in this, I see the same kind of thing in other CAD SoftWare applications.

 

If you really want this to work I recommend you post actual examples to illustrate your point and participate in Beta http://beta.autodesk.com keyword Brunel

 

also,

http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=1109794

 

 

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Contributor
Julianortegaic
Posts: 15
Registered: ‎10-15-2013
Message 5 of 10 (120 Views)

Re: Degree of freedom analysis

10-22-2013 12:13 PM in reply to: moto748

an initial componetn in an assambly have 6 DOF, how could i do to constrain a degree of freedom, I need that my component only have 5 DOF ( 3 rotational and 2 translational).

 

Thanks

Constrain an element to a plane in an assembly
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JDMather
Posts: 26,257
Registered: ‎04-20-2006
Message 6 of 10 (116 Views)

Re: Degree of freedom analysis

10-22-2013 12:19 PM in reply to: Julianortegaic

Attach your assembly here if you can't figure it out.

 

If you Mate a point on the part to one of the origin planes (or a planar face of another part)  the point cannot leave the plane but can translate in 2 DOF of the plane.  The rotational 3 DOF are retained.

 

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Contributor
Julianortegaic
Posts: 15
Registered: ‎10-15-2013
Message 7 of 10 (105 Views)

Re: Degree of freedom analysis

10-22-2013 12:37 PM in reply to: JDMather

I havent the assembly in this moment, so i cant attach it, I will do it later.

 

the thing that i have to do is don't let that the component will have vertical displacement ( axis Z) but I need that the component could rotate around the 3 axis and could move it in X and Y plane.  ¿is that possible? 

Constrain an element to a plane in an assembly
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JDMather
Posts: 26,257
Registered: ‎04-20-2006
Message 8 of 10 (97 Views)

Re: Degree of freedom analysis

10-22-2013 01:03 PM in reply to: Julianortegaic

Check attached.

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Contributor
Julianortegaic
Posts: 15
Registered: ‎10-15-2013
Message 9 of 10 (80 Views)

Re: Degree of freedom analysis

10-22-2013 06:48 PM in reply to: JDMather

Hi, I saw the Attached File and ist exactly waht I need, could you helpme to explain how a made a Mate with the component and a plane, I am attaching the assembly , there is 4 frame conected to a "joints" with a mate and tangent constrain, but I need that the joints stay in the same plane that be the grounded one, but able to rotate in the 3 axis and move in the other 2 planes.

 

 

Thanks 

Constrain an element to a plane in an assembly
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JDMather
Posts: 26,257
Registered: ‎04-20-2006
Message 10 of 10 (55 Views)

Re: Degree of freedom analysis

10-24-2013 02:59 PM in reply to: Julianortegaic

Did you figure this out?

Please mark this response as "Accept as Solution" if it answers your question.
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Inventor Professional 2015 64-bit
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http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm

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