topic Re: Multiple Joints in Fusion Support Forum

Multiple Joints

info4DKZM — Wed, 03 Nov 2021 11:32:15 GMT

Newbie trying to figure out Joints. I'm probably missing something fundamental, but can't figure it out.

I'd like to have the yellow lever rotate freely around it's pivot on the end of the black lever, which is also pivoted. When I apply joints to each, the yellow lever becomes locked in position. If I ground the black lever I can rotate the yellow as I want, but then of course the black lever won't rotate.

Thanks !

https://a360.co/3BHrrEL

Re: Multiple Joints

davebYYPCU — Wed, 03 Nov 2021 20:48:00 GMT

If you have any contact sets, remove them.

presuming the black pivot pin is grounded,

if this does not fix it - will need access to the file to see what is causing it.

Might help....

Re: Multiple Joints

jeff_strater — Wed, 03 Nov 2021 20:54:47 GMT

I'm looking at this. There are no contact sets involved. Both joints are free to move - you can see this if you create a Motion Link between the two (not saying this is a solution, just a technique to see that both can move). Also, Drive Joint and Animate Model can show both joints are free to move. Not sure why component drag does not work...

Re: Multiple Joints

gautham_kattethota — Wed, 03 Nov 2021 21:39:49 GMT

Hi @info4DKZM ,

There are some self-paced tutorials and documentation on creating and using Joints that you might find useful:

Manually Adding Joints: https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-2FEB70A9-4A49-4DF2-A7A7-80CA0FA7364D
Working With Subassemblies and As-Built Joints: https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-C00393B7-CA64-4A77-BB32-75BBD5683659
Enabling Motion Using Joints and Contact Sets: https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-E36FD62D-DB42-42E4-AC2F-7CFE8204B723

Video Series that cover joints and motion:

Mechanical Assembly Fundamentals: https://help.autodesk.com/view/fusion360/ENU/courses/AP-C-MECHANICAL-ASSEMBLY-FUNDAMENTALS
Creating Assemblies: https://help.autodesk.com/view/fusion360/ENU/courses/AP-C-CREATING-ASSEMBLIES

Hope you find these useful.

Regards,

Gautham

Re: Multiple Joints

btrfabrications — Thu, 04 Nov 2021 13:48:04 GMT

I am having trouble with this too. Using animate and drive joint shows the joint can move, but I cannot component drag. I have a model that was created maybe a year or two ago and the component drag works in this model but not any of my new designs.

Re: Multiple Joints

btrfabrications — Thu, 04 Nov 2021 14:04:38 GMT

I needed one of the components in the model to be grounded.

Re: Multiple Joints

info4DKZM — Thu, 04 Nov 2021 14:39:25 GMT

Thanks. There are no contact sets and the pivot is grounded. If I ground the Black lever itself I can rotate the yellow lever like I want, but then I loose motion on the black lever.

I thought I had provide a public link to the drawing, is it not available ?

Re: Multiple Joints

info4DKZM — Thu, 04 Nov 2021 14:40:56 GMT

The pivot for the black lever is grounded.

Re: Multiple Joints

info4DKZM — Thu, 04 Nov 2021 14:45:36 GMT

Yes, the motions I need are correct when I animate each joint, but when component drag is attempted they are locked together.

Re: Multiple Joints

info4DKZM — Thu, 04 Nov 2021 14:57:54 GMT

Novice in the Forum too..... F3d attached and a stop motion of the animation I'm trying to achieve.

Re: Multiple Joints

TrippyLighting — Thu, 04 Nov 2021 16:23:31 GMT

I am not sure this can be done with Fusion 360.

To be honest, this is a complete redo as that is likely the only way to avoid all the yellow waring icons you have in your assembly. You should NEVER ignore a waring and fix the root cause immediately when the waring occurs.

Also, using the align feature to locate/orient components, and the subsequent use of an as-built joint is not a technique I would recommend.

Re: Multiple Joints

info4DKZM — Thu, 04 Nov 2021 16:43:45 GMT

Thanks, yeah it's a bit of a mess. Must admit getting to grips with the Fusion workspace and methodology is not easy coming from Rhino. Would you know if the motions are possible in Solidworks or other ?