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Distinguished Contributor
lis_wang
Posts: 429
Registered: ‎11-26-2003
Message 1 of 5 (266 Views)

DOF of a fully constrained woodruff key

266 Views, 4 Replies
10-30-2012 07:18 AM
After I fully constrained the woodruff key on the shaft and shaft was also fully constrained, why the woodruff key still has 5 DOF? Please see the attached file here. Thanks
Distinguished Contributor
lis_wang
Posts: 429
Registered: ‎11-26-2003
Message 2 of 5 (266 Views)

Re: DOF of a fully constrained woodruff key

10-30-2012 07:22 AM in reply to: lis_wang

Sorry forgot to attach the file in my last message. So post again

Distinguished Mentor
john.retzlaff
Posts: 896
Registered: ‎11-03-2003
Message 3 of 5 (244 Views)

Re: DOF of a fully constrained woodruff key

10-30-2012 08:44 AM in reply to: lis_wang

Same here, but if you change the tangent constraint on the key to mate, it goes away.

John Retzlaff
Valued Mentor
BLHDrafting
Posts: 350
Registered: ‎10-12-2012
Message 4 of 5 (206 Views)

Re: DOF of a fully constrained woodruff key

10-30-2012 08:02 PM in reply to: john.retzlaff

It is often dificult (a.k.a.) impossible to know why but sometimes you just gotta trust that the software knows best :smileyhappy:

 

I find the tip near the bottom of this webpage http://wikihelp.autodesk.com/Inventor/enu/2012/Help/0073-Autodesk73/0460-Assembli460/0461-Build_as46... really useful when trying to nail down DOF issues.

 

P.S. This note from the same wiki page can also be useful.

 

If the selected component is constrained relative to an underconstrained part, a cube appears on the degrees-of-freedom symbol. To highlight the relative part, hold the cursor over the cube until it changes color. The faces of adaptive parts which have degrees of freedom remaining are displayed in a contrasting color when you hold the cursor over the cube.

 

While these tips may not track down your exact problem they might help. Best of luck.

Brendan Henderson

Web www.blh.com.au
Twitter @BLHDrafting

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Distinguished Contributor
lis_wang
Posts: 429
Registered: ‎11-26-2003
Message 5 of 5 (198 Views)

Re: DOF of a fully constrained woodruff key

10-30-2012 09:26 PM in reply to: BLHDrafting

Thank you very much.

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