Multiple dependent joints, expressions/constarints and gravity

[Anonymous]

Hello everyone,

This is my first post. I'm very new to Fusion but not 3D.

I'm currently designing a vertical folding gate for my driveway and I'm finally at my limits of knowledge.

As the top bar gets lifted, the vertical bars should lift the lower bar at nearly the same rate as the top but that's not happening. There's no gravity. Can I add that ?

If not, how can I have this behave more realistically?

The pictures show that I'm working with one bar for now. I figure I'll get one working first. For the hell of it,  I've added one more vertical bar to the mechanism and everything locks up / no longer moves.

I'd truly appreciate some direct suggestions or related tutorials.

Cheers and thank you

Gerald

[davebYYPCU]

Are you looking for 

1, the vertical bars to stay vertical? or 

2, Stay square to the top rail?

Gravity?, I don't use simulation.

Might help if you include the file.

[Anonymous]

The Verticals would stay pretty much vertical until they collide with each other. I want to see if my offset of the upper and lower hinge will allow the gate to be lifted to 90 degrees.

I'd love to add the file. How do I do thatÉ

G

[davebYYPCU]

File > Export, save to hard drive, 

New message, under the text window there is a paperclip icon, heading is Attachments, click the paper clip, 

select the exported file name.

You 4 hinge points will work as a parallelogram

The post will need a pin slot in one of the joints.

Might help....

[jeff_strater]

there is no gravity in Fusion.  It does not have dynamic simulation capabilities today.  You can maybe simulate it if you set up some Motion Links between your designs.  Using a Rest Position on a joint can add a "spring-like" behavior to your design, which can sometimes simulate gravity, but those are the only options currently.

[Anonymous]

Here's the file.

I've added a lower cylindrical joint and its worse now.. Everything is locked up.

Thanks for the input so far

[davebYYPCU · Accepted solution]

Small mod to make it work, 

might not be what you end up doing, but will get you thinking.

Animate Model, Rev 1.

Blue lines will keep you awake at night.

Might help....

[Anonymous]

Thank You Dave!

I see my offsets were unnecessary. I hadn't done a motion link yet either.

I'll keep refining my idea.

Cheers