Naming a 3D dimension to reference elsewhere

[daviddoria]

Say I create a Sketch of a Rectangle that is 'A' x 'B'. Then I Extrude it. Then I Shell [Outside] it, with Outside Thickness 'C'. The resulting 3D shape is '[A+2C] x [B+2C]'. I'd like to create a user Parameter called "Exterior Width" with value [A+2C] , and another user Parameter called "Exterior Length" with value [B+2C]. But I do not want to write those equations directly in the Parameter editor, because the operation (in this case, Shell) does that calculation for me, and if I get it wrong or it otherwise gets out of sync then everything will break. This is essentially the concept of a "Driven Dimension", but on the 3D shape. Is there a way to do this?

Thanks!

David

[davebYYPCU]

Definitely out of sync with that math - the resulting 3D shape volume is '[A+2C] x [B+2C].  What is the use case, normally Fusion will do all that.

Might help…

[daviddoria]

Hahaha, I've accidentally made my point stronger that it's likely the manual expression is incorrect vs the actual geometry that is generated by the Feature:). I've now corrected the original post.

The use case is now I want to use that exterior dimension for something else. E.g., make a second component that has a Sketch where an edge is the same as that outside dimension in the first part.

[davebYYPCU]

Is the new, parametrically connected, (sketch projection) or just a dimensioned length (A+2C)

It’s not clear.  You are aware that dimensions are only sketch objects?

[daviddoria]

My question is simply how to get the exterior measurement of the part after the Shell [Outside] into a named parameter that I can use elsewhere.

[davebYYPCU]

That's - write the formula into the parameter there is nothing existing in your statements to reference, so it's calculated by you. (A + 2 C)

Might help...

[daviddoria]

But there is something to reference, it's just that Fusion doesn't seem to make it referenceable. Right? I just want to make sure the question is clear and this is just a limitation of the way Fusion works that it's not possible to do what I want.

[davebYYPCU]

But there is something to reference, only with the Measure Tool.

it's just that Fusion doesn't seem to make it referenceable. Right?  As above

I just want to make sure the question is clear and this is just a limitation of the way Fusion works that it's not possible to do what I want.  Not really.

the way Fusion works that it's not possible to do what it how I want it to.  That's correct.

Might help...