Multiple Assembly Rotate & Move

[jlucasemail]

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

[davebYYPCU]

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.

[TrippyLighting · Accepted solution]

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.

[jlucasemail]

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.

[TrippyLighting]

Yep, no need to dumb it down for us.

[jlucasemail]

No, I was dumbing it down for me!!

[chrisplyler]

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.

[jlucasemail]

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.

[TrippyLighting]

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

[chrisplyler]

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@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.

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Meh. Cam of complex shape. Still no play.