topic Re: Rotating Cylinder Inside Another Cylinder Dynamic Sim in Inventor Forum

Rotating Cylinder Inside Another Cylinder Dynamic Sim

Anonymous — Sat, 09 Oct 2021 00:51:58 GMT

Hey everyone,

I'm kind of new to Inventor simulations and I think this might be just a quick fix.

I have an inner shaft and the outside case of a motor, as the shaft rotates in one direction the case should rotate in the opposite direction. I can get this to work in the assembly using a motional constraint no problem but when I port it to dynamic sim they wont rotate together like that. What am I missing?

Thanks in advance and I have attached the .iam file.

Best Wishes

回复： Rotating Cylinder Inside Another Cylinder Dynamic Sim

chenj — Sat, 09 Oct 2021 04:40:14 GMT

Parts are missing from your attachment. I simply do a dynamic simulation in Inventor 2022, see the attachment.

回复： Rotating Cylinder Inside Another Cylinder Dynamic Sim

Anonymous — Mon, 11 Oct 2021 18:57:52 GMT

Thanks for getting back to me,

I've downloaded your simple system and will try to see what the difference is.

I've attached the parts I used and the assembly again. Let me know what you think.

Thanks again

Re: Rotating Cylinder Inside Another Cylinder Dynamic Sim

Anonymous — Mon, 11 Oct 2021 19:17:06 GMT

I see that you basically imposed two counter motions on the cylinder and shaft but is there no way to make one respond to the other?

Re: Rotating Cylinder Inside Another Cylinder Dynamic Sim

JDMather — Tue, 12 Oct 2021 00:57:05 GMT

@Anonymous

See Attached.

Re: Rotating Cylinder Inside Another Cylinder Dynamic Sim

Anonymous — Tue, 12 Oct 2021 01:14:35 GMT

Thanks for helping me with the solution!

This works perfectly, never would have occurred to me to make a dummy sketch and add two joints. Really appreciate it.

Also really enjoy your youtube content, have learned a lot.

Best Wishes

Re: Rotating Cylinder Inside Another Cylinder Dynamic Sim

JDMather — Tue, 12 Oct 2021 13:33:56 GMT

Another "solution" would not require the dummy part.

Simply use the Input Grapher to make the Imposed Motion of one of the Revolution Joints a ratio of Imposed Motion on the other Revolution Joint. Actually, now that I think about it - it is even easier than that. Don't need to use the Input Grapher. Just set the ratio in the Imposed Motion.

回复： Rotating Cylinder Inside Another Cylinder Dynamic Sim

cuiken — Fri, 29 Apr 2022 06:42:12 GMT

How two parts rotated?

I have one part rotate and one part moved.

See attachment.