Joints are stuck and I want to know why :)

[teunteeuwen]

Hi,

I would like to know why my joint is stuck? While the frame does move when I drive the joint attached to the problem case. See video. Iwanted to upload the file with the design too but I think I need to make an editable design of it first. Can anyone tell me how to do that too please? Right now it's a file with imported components.

Thanks in advance!

[jhackney1972]

If you do not know how to attach your Fusion 360 model follow these easy steps. Open the model in Fusion 360, select the File menu, then Export and save as a F3D or F3Z file to your hard drive. Then use the Attachments section, of a forum post, to attach it. If needed, ZIP a F3Z file.

[teunteeuwen]

the website wouldn't let me upload the f3z file. 

here is a zipped file. hope that works.

[jhackney1972 · Accepted solution]

I will not return your model because it is both large and if you upload it, all the components will be duplicated.  In the video I explain what to do.

[teunteeuwen]

thanks John!

[teunteeuwen]

Quick follow up question. Is the problem linking to many revolving joints together? Or just having to many in the model?
And is constraining things better to avoid these situations?

[jhackney1972]

The problem is neither of what you mentioned.  The issue is purely geometrical.  When you create a model like yours you probably will introduce some slight misalignment between joints.  A Revolve joint has only one degree of freedom of motion where a Cylindrical joint has two degrees of freedom.  This often will relieve the slight misalignment between components.

[teunteeuwen]

Is fusion just not very capable of handling complex assemblies with a lot of moving parts? I wasn't done with the previous model jet. So when I created a few more joints/constraints the model just locks up again. No matter what kind of joint or constraint I make it. It will not let me move the parts to do a motion study. And when trying to drag other parts it just moves in stranges ways, like moving a joint that should be constrained. I mainly wanted to see if the parts can move so I don't 3D print a lot of useless parts. Would it help to follow the guidelines in this video for example? 
https://www.youtube.com/watch?v=Ur0b6hh9joM
Or is it just better to use Inventor of SolidWorks for something like this?

[davebYYPCU]

I have reviewed the file now.  I have reviewed both movies.

The file I downloaded has no problems in it that I can see.  Drive Joint is a clunky way to review, use Animate Joint or Joint Relationships, depending on what you are testing.

John found something but was all working for me.

Fusion will handle all legally constructed Joints - but will not allow even a tiny misalignment.  

Changing a Revolve to Cylindrical, is (laziness) often recommended.  
Adding the flush Constraint, to a Cylindrical, means the Revolve was not flush in the first place - however the file was not in error, here.

The answer should be fix the misalignment (Edit selected position in Revolve Joint)

John mentioned an over centre problem, leaving it to you to fix, (with travel limits)

I have not delved into Constraints, because on the face of it you need 3 of them to construct a situation, that I can do with one Joint.

The movie you reference, deals with workflows, but, he does not have any misalignments either.

Might help….

[teunteeuwen]

So basically I should just learn to neatly design my files? Still working on that :). Thank you.
But just to be clear. Fusion should be able to handle designs with many assemblies and joints?

[davebYYPCU]

Yes, any legal joint will work, no misalignment is tolerated.  Won't matter how many.

There is a Motion Link, that does nothing in the file - deleted here without a problem? Iris are tied together with other Joints.

The right eyelid lever operates both eyelids, but the left eyelid lever is independent, and I haven't found out why yet. (Rev 21 and 23).  Suspect the Joint Component selection.

Might help...