topic Re: Joints. Two gears connected by loose rod in Fusion Design, Validate & Document Forum

Joints. Two gears connected by loose rod

20468DACQ — Mon, 20 Jun 2022 23:31:33 GMT

The final point of this assembly is that it should produce sort of random movement of the rod.
(If we take in to account gravity and friction than even more so.)

I think the screenshot (Fusion file attached as well) explains a lot, but one thing...
What I have been able to do so far – based on this concept https://forums.autodesk.com/t5/fusion-360-design-validate/joints/m-p/9251195#M205454 is that when I move with the rod, the small wheel rotates and the rod position is influenced by the second wheel. It kinda mimics the desired behavior.
The problem is that I can't find a way how to rearrange the joint logic so that if I rotate one of the wheels, the rod will follow the movement restrained by the primary wheel joint and also be influenced with the joint on driven second wheel.
Sure limits will be handy too, but that is another topic.

Re: Joints. Two gears connected by loose rod

kevinwatts — Mon, 20 Jun 2022 23:55:44 GMT

Hello, there was a tutorial with an example a few years ago that might help. They may not be the same but the basic concepts can be applied. I may have been added to the Learn & Support information. Look for fusion 360 gears and sliding joint assembly.

How to Add Joints and Contact Sets to a Geneva Drive in Fusion 360

https://www.youtube.com/watch?v=UkGdrTyAaBg

Also, checkout tutorials by fusion 360 Lars Christensen. He goes in to depth with a lot of applications. I think that he had at least one like that.

Re: Joints. Two gears connected by loose rod

jhackney1972 — Tue, 21 Jun 2022 00:47:46 GMT

I am not sure the motion your are expecting, not a lot of control with the Joints you are using. To get it to function, I added Joint Limits to the Pin and Slot Joints so they would not bottom out. You probably could play with them and get a more predictable motion. It runs a lot smoother than the Animated GIF. Model is attached.

Re: Joints. Two gears connected by loose rod

20468DACQ — Tue, 21 Jun 2022 07:25:13 GMT

@kevinwatts thanks for the video links I'll check them out.

@jhackney1972Awesome !
It is kinda wild and that is ok, as it is able to show quite well the random rod move and its various positions. That helps me to study possible behavior of other parts in the system that will be influenced by the non-synchronized rod moves.

Thanks a lot, to all of you!
(I'm gonna post here picture of the final "product" when it turns to reality, if I won't forget.. that might take few months tho .) )

Re: Joints. Two gears connected by loose rod

20468DACQ — Tue, 22 Nov 2022 13:48:10 GMT

Hello,

as I said here is the "final product" the joints simulation has been used for.
Once again, thank you for the help.

https://youtu.be/6LcDRbHS1nk