topic Multiple Assembly Rotate & Move in Fusion Design, Validate & Document Forum

Multiple Assembly Rotate & Move

jlucasemail — Fri, 08 Mar 2019 01:26:42 GMT

Multiple Move

I can rotate the blue disk around it's off-centre axis. What I can't do is get the green rocker to oscillate about its own axis at the right hand corner.

Thanks

https://a360.co/2ETqBcL

Re: Multiple Assembly Rotate & Move

davebYYPCU — Fri, 08 Mar 2019 02:13:32 GMT

Your picture shows a rigid joint, at the pivot position of the green arms.

if there is a free to move revolute at the pivot point, for the pin, it should work.

What is grounded?

See if this will do.

Re: Multiple Assembly Rotate & Move

TrippyLighting — Fri, 08 Mar 2019 02:23:08 GMT

Looking at your design I think you are going too quickly into more advanced areas before you have the basics down.

Your single sketch is not fully dimensioned or constrained and it is very easy to break this design.

The screencast shows how to get the parts to behave as intended.

Re: Multiple Assembly Rotate & Move

jlucasemail — Fri, 08 Mar 2019 14:04:34 GMT

Thanks all. I should perhaps have given more information! The actual model is far more complex than shown having a bank of cams each driving an oscillating lifter. As I was having problems figuring out the jointing I built the simplest sketch possible to demonstrate the issue.

Re: Multiple Assembly Rotate & Move

TrippyLighting — Fri, 08 Mar 2019 14:05:44 GMT

Yep, no need to dumb it down for us.

Re: Multiple Assembly Rotate & Move

jlucasemail — Fri, 08 Mar 2019 14:09:35 GMT

No, I was dumbing it down for me!!

Re: Multiple Assembly Rotate & Move

chrisplyler — Fri, 08 Mar 2019 15:08:19 GMT

May I strongly suggest that you don't put round ends on the follower in real life as you have done in the file. As you can see once the model is functioning correctly, the follower with round ends will NOT stay in contact with the cam as the cam rotates. In real life, if you spin such a mechanism very fast, it's going to destroy itself pretty quickly.

Re: Multiple Assembly Rotate & Move

jlucasemail — Fri, 08 Mar 2019 16:11:03 GMT

Thanks for the comment. In real life the cam will be a complex shape and the arms on the follower will have small ball bearings attached so there will be no rubbing. The speed will be 10 RPM or less and a bit of play will not matter.

Re: Multiple Assembly Rotate & Move

TrippyLighting — Fri, 08 Mar 2019 16:34:40 GMT

In a more complex assembly the contact sets are unlikely to work.

Re: Multiple Assembly Rotate & Move

chrisplyler — Fri, 08 Mar 2019 17:51:01 GMT

@jlucasemail wrote:

Thanks for the comment. In real life the cam will be a complex shape and the arms on the follower will have small ball bearings attached so there will be no rubbing. The speed will be 10 RPM or less and a bit of play will not matter.

Meh. Cam of complex shape. Still no play.