Is this 'grounds' for concern?

[lemelman]

I'm making some updates to a model I created several months ago. It consists of a main frame onto which are mounted several other components. The frame was originally grounded (and I certainly haven't un-ground it) but I discovered I can move it around. When I check I'm allowed to Unground it but not Ground it, so to my mind that implies it is Ground already. So why can it be moved?

 

[davebYYPCU]

If you can move it with click drag, it’s not Grounded.

you will get a red pin in the timeline when grounding is successful.

I believe you can’t ground an Assembly, it must be a component to be grounded, as the Assembly is a group of components, you need to dig into that Assembly.

consider all parts of the frame without motion for a rigid group.

Might help.....

[jeff_strater]

@davebYYPCU is correct, sort of.  You can, indeed, ground an assembly.  However, that will only ground that component, not any child components of that assembly.  The ground does not "transfer" to the children.  You need to explicitly ground the components you wish to not move.  If needed, I can provide a screencast that illustrates this.

[laughingcreek]

@davebYYPCU is right.  mostly.  You can ground an assembly, but it just effects it's origin and bodies at the top level.  sub assemblies are still free to move.  your moving a sub-component with-in the frame component (I would guess the one named bottom frame).  If you turn on the visibility of the origin for "Frame" you'll see it doesn't move.  turn on the the visibility  of the origin for the sub-component your moving, and you will see it moves with the sub-component.

[TrippyLighting · Accepted solution]

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@davebYYPCU wrote:

I believe you can’t ground an Assembly, it must be a component to be grounded, as the Assembly is a group of components, you need to dig into that Assembly.

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This is incorrect!

My workflow for assemblies follows the hierarchy of the assembly. Either the first component or the stationary component in an assembly/subassembly gets rigid grouped to the next upper level origin . That way the origin of the assembly is involved in the joints and as such can be grounded.

This one of the main reasons why many people have problems with assemblies in Fusion 360. If you treat your origins well then many assembly problems magically vanish.

[lemelman]

Thanks guys, that explains it.