topic Re: motion linking a differential in Fusion Support Forum

motion linking a differential

rtorpey1 — Sun, 06 Aug 2023 06:08:53 GMT

I made a differential-driven robotic wrist that I'm trying to motion link, but motion links being bidirectional is making it difficult. I want the rotation of the driven gears to affect the purple driven gear and the yellow mount but not vice-versa. Does anyone know how I can achieve this? I tried contact sets but my laptop can't handle it.

Re: motion linking a differential

TheCADWhisperer — Sun, 06 Aug 2023 09:33:01 GMT

@rtorpey1

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

Re: motion linking a differential

rtorpey1 — Tue, 08 Aug 2023 06:13:26 GMT

Thanks for your reply, here is my file.

Re: motion linking a differential

jhackney1972 — Tue, 08 Aug 2023 14:06:45 GMT

Creating the Motion Links between the drive gears and the driven spindle gear is not an issue. The problem is the creating of a link that will control the driven spindle gear when the yellow gear carrier is moved. Linking the motion of the carrier to one of the drive gears or the driven spindle gear will create a problem because it affects the other motion link. You are right, Contact Sets will probably not work here, too much contact area.

I have attached the model with the main drive motion link in place. I did not worry about tooth mesh. I will keep pondering on this issue. By the way, nice model.

EDIT: I figured out a way to make the movement of the yellow gear carrier to drive the gear train but this brings up problems with driving the main gear train. I explain this in the attached video. Updated model attached.

(view in My Videos)