Assembling 2 component doesn't seems to work as it should!

[Beyondforce]

Hey There,

As you can see in the short video (I have also attached the file), I was trying to connect the Accordion Arm to the 2 connectors sliding on a pin. But, the second arm gives me an error, which I can't figure out how to fix. 

 <iframe width="640" height="650" src="https://screencast.autodesk.com/Embed/Timeline/46b18ac6-eb08-49ea-9ce8-c9425087d80b" frameborder="0" allowfullscreen webkitallowfullscreen></iframe>

I hope someone can help me to find a solution!

Cheers / Ben

[jeff_strater]

I think the problem is that when you created the first joint at about 0:16 in the video:

When you added the offset here, it moves all the geometry to the correct location.  But, then, later, when you add the second joint, you do not have this offset (at first):

Which leads to the conflict.  What is certainly a bug is that the conflict remains, even after you cancel the command.

I have downloaded your example, and I'm working on it now to see if I can get it to work correctly.  More later!

Jeff

[Beyondforce]

Hey Jeff,

My suspicion is, that Fusion cannot join 2 components that are not symmetrical (Level) to each other. In real life, the Rib will bend which not a problem. But in Fusion 360 it does not understand the properties of materials, and it will not allow it to connect if it's not straight!

Well, that's my theory 🙂 But if you have a solution for that, that will be amazing!

Thanks.

[TrippyLighting]

I am not on my Fusion 360 station at the moment but if you convert the center revolute joint between the the two arms into a cylindrical joint it should work.

Also in general a washer between the two arms would make the design work much smoother in the real world 😉

[Beyondforce]

Hey TrippyLighting,

That was the first thing that have tried, but it didn't work.

Maybe I'm asking too much from Fusion 360 😉

[jeff_strater · Accepted solution]

Here is a version that works.  It took some fiddling around to get it, and @TrippyLighting is correct - in order to counteract the fact that the geometry is not 100% accurate (the bars bend in real life), you have to make one of the revolute joints a cylindrical joint.  I still don't have a video of making it (I started, but made mistakes, so will try again).  Here is a picture and video of the results, though

Jeff

[Beyondforce]

Hey Jeff,

This is AMAZING, you did it 😄

Thanks A LOT!

Cheers/ Ben

[jeff_strater]

Here is the video of the steps I took.  It's relatively straightforward, but since I recorded it, thought I'd share it.

There are still things to do here, mostly around joint limits to prevent the whole mechanism from inverting.  And, of course, if you really want it to work right, you'll have to make the crank work, etc...

Good luck with your design.

Jeff

[Beyondforce]

Excellent, even though it's not sitting in the middle, at least it's working. I have tried to offset it so it will be in the middle, but it didn't want it to respond to the changes.

Thanks a lot again.