Fusion 360 Object Face Constraints?

[ThePieMonster]

I wanted to ask about Fusion 360 object "constraints". As someone of 10 years coming from Inventor, I noticed there is not a face/body constraint option in Fusion 360. Joint constraints do exist on both platforms but it is not the same as a face constraint as there are other requirements that are needed for a joint constraint to work which is true in both Fusion and Inventor.

As you can see in the linked video, Inventor has a grounded object and then 3 face constraints are applied to the second object. Each of the constraints applied to the second object are restricting the second objects movement by a single plane. Eventually all 3 planes are restricted and the object is artificially grounded. 

In Fusion 360, I have only found the align tool. This just places the object in the position you would except, like the Inventor face constraint tool, but you can move the object afterwards. Additionally, grounded the object in Fusion would be the next logical idea, however in more complex workspaces, even grounded or pinned objects can still be freely moved about the workspace.

https://vimeo.com/948940642

[jhackney1972 · Accepted solution]

You can do the same thing in Fusion by using a Planar joint between two points on component faces, making sure you Lock the Rotation motion of the joint.  If you are using construction planes or planes only, you can add a sketch point to each and use the same method.

[davebYYPCU]

Wow, Inventor makes you to all that,

where Fusion just wants these 2 corner points coincident.

Might help...

[ThePieMonster]

@davebYYPCU You can click a corner edge to another corner edge in Inventor as well. I was just clicking around to show how to constrain on a face by face basis. Inventor's constrain menu is very good actually and you can get really deep with it, or you can just be simple and click a corner point. Its all about the granularity. 

[ThePieMonster]

@jhackney1972 Got to play around with Fusion Joints this morning. Seems like there is a good amount of features present but they are hidden on that motion tab which was not easy to find (I didn't know it was there). 

Anyway, the only issue I have noticed is that in the Joint -> Motion tab I need to click back to "Ridged" and then "Planar" when making joints. I think its a UI bug, the UI does not realize what selection you have used previously so you need to select something else and then back to your original saved selection. 

Thanks for the video!

[davebYYPCU]

Were you after a rigid joint with those two points coincident? 
or the Planar joint?

Both video examples did not steer me towards Planar.

Research the properties of the Joint disc, and all will fall into place.

(motion tab was an upgrade, was once a single page dialogue box)

Might help….

[ThePieMonster]

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@davebYYPCU wrote:

Were you after a rigid joint with those two points coincident? 
or the Planar joint?

I was just attempting to constrain two faces together. Again, coming from Inventor, my view on constraints is going to be different then Fusion where everything seems to be some form of a joint. To me, a joint is only meant for motion and Inventor lists it as such. A face constraint would not use the joint tool in Inventor. 

My video was just a quick example video I through together to showcase what I was after, it had to purpose other than that. 

I don't see anything called "Joint disc" in this doc. Perhaps you are referring to something else? 

https://help.autodesk.com/view/fusion360/ENU/?guid=ASM-JOINTS

[davebYYPCU]

They are calling it a Joint Origin.  Just to confuse the Joint Origin Tool of the same name.  
(That documentation is out of date - again you have to dig for it)

When creating a joint, the cursor changes to an orientation disc - alignment of the 2 components being jointed is dependent on the selection and orientation of the “disc” position when snapping.

Fusion does not have Face Constraints, they are incorporated into the Joint system.

Might help….