topic Re: Joint between rigid groups in Fusion Design, Validate & Document Forum

Joint between rigid groups

javelin_exile — Thu, 09 Mar 2023 17:44:46 GMT

Hi Folks

I have a new model I'm making that I've imported 2 models into as components and made each into rigid groups so they hold together. Now I'm making a revolute joint between these 2 rigid groups so that they can function. The 2 groups are already positioned but as-built joints don't work. There is no error or anything the dialog just doesn't come up. I can use a regular joint to join them and it does work but one of the 2 components tilts 5° as soon as I click ok. the joint stays at 0° the part moves and is 5° turned from where it was. how do I track down what's happening?

Re: Joint between rigid groups

jhackney1972 — Thu, 09 Mar 2023 19:18:59 GMT

The only way I know is to attach your model to a reply post. I tried what you described and it works OK for me. If you do not know how to attach your Fusion 360 model follow these easy steps. Open the model in Fusion 360, select the File menu, then Export and save as a F3D or F3Z file to your hard drive. Then use the Attachments section, of a forum post, to attach it.

Re: Joint between rigid groups

javelin_exile — Thu, 09 Mar 2023 19:58:41 GMT

I can't attach this particular file but it's happened again on another assembly. Here's a video of trying to add the joint and the results. As soon as the joints are made the part turns. it's only happened since I made these rigid groups.

Re: Joint between rigid groups

TrippyLighting — Thu, 09 Mar 2023 20:04:50 GMT

@javelin_exile wrote:

... how do I track down what's happening?

Inspect the orientation of the origins of your components!

I bet one of them is rotated 5 degrees.

Re: Joint between rigid groups

johnptc314159 — Thu, 09 Mar 2023 21:05:01 GMT

around the 9 second mark the joint axis x and y seem to not line up with the vertical ( they are rotated). i think once jointed fusion rotates it to line up with the other part.

Re: Joint between rigid groups

javelin_exile — Thu, 09 Mar 2023 21:08:57 GMT

Found a tweaked origin and aligned it with the others but it still twists when the joint is added. it's the weirdest problem.

Re: Joint between rigid groups

javelin_exile — Thu, 09 Mar 2023 21:13:01 GMT

yea that's what's happening, I found a twisted origin and fixed it with align but it still twisted after the joint. see the new vid I posted I tried to align on the origin plans again and the twisted one pulled the ones from the other parts but not all of them.

Re: Joint between rigid groups

johnptc314159 — Thu, 09 Mar 2023 21:31:45 GMT

might just redraw the bearing assembly 🙂

Re: Joint between rigid groups

davebYYPCU — Thu, 09 Mar 2023 22:15:40 GMT

What about you find the actual problem, and then edit the original assembly.

Might help....

Re: Joint between rigid groups

javelin_exile — Thu, 09 Mar 2023 23:41:10 GMT

Perfect, why didn't I think of that lol

Re: Joint between rigid groups

javelin_exile — Thu, 09 Mar 2023 23:42:42 GMT

I worked around it but saved the files as they werre. these purchased/imported parts sometimes cause issues here and especially in Solidworks and I'd really like to know how to find and where to look for these issues.

Re: Joint between rigid groups

davebYYPCU — Fri, 10 Mar 2023 00:32:18 GMT

Usually becomes self evident when you unhide the Origin Items.

Might help...

Re: Joint between rigid groups

javelin_exile — Fri, 10 Mar 2023 21:29:55 GMT

Is there a global command to unhide these items? I can turn them on and off in display settings but it won't change the state of items that are buried in components.

Re: Joint between rigid groups

davebYYPCU — Fri, 10 Mar 2023 22:52:03 GMT

Global setting switched on, and

Browser eyeballs show and hide them as required.

For every new sketch the origin planes are displayed at time of creation, regardless of the Eyeball status.

Might help.....