Rotating Cylinder Inside Another Cylinder Dynamic Sim

[Anonymous]

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 

[chenj]

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

[Anonymous]

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

[Anonymous]

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? 

[JDMather · Accepted solution]

@Anonymous 

See Attached.

[Anonymous]

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

[JDMather]

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.

[cuiken]

How two parts rotated? 

I have one part rotate and one part moved.

See attachment.