Where do parameters go when you copy a sketch to a new design?

[juliangall]

I have a parameterised sketch in one design. I have selected the the sketch elements, copied them and pasted them into a new sketch in a new design (following this thread https://forums.autodesk.com/t5/fusion-360-design-validate/copy-sketch-between-documents/td-p/5954887).

The sketch dimensions in the new version still refer to the parameters, but the parameters are not listed in the Change Parameters dialog.

How can I modify these parameters in my new design? N.B. I don't need them linked to the original design, just to be able to modify them in the new design.

Thanks,

Julian

[TrippyLighting]

You'll find them listed under Model parameters a little further down in the parameter dialogue.

However, I am wondering if there is also a bug at play.

In the originating design I created a user parameter:

The dimension referencing it in the sketch shows the little "fx" symbol to indicate that this is driven from a user parameter:

When you copy the sketch objects into a new sketch into a new design the parameters are in the Model Parameteers:

And the symbols in the sketch are gone because it is not considered a user-defined parameter:

Also, note  that the sketch now is not constrained because the copied elements don;t automatically constrain to the sketch origin. Easy to fix, but also easy to forget 😉

 

 

[juliangall]

Thanks, Peter. I have similar "Model Parameters" but these refer to the named User Parameters that were present in my first sketch. For example, I have Model Parameter d1 and the expression for this is:

length / 2

'length' is a User Parameter from my source sketch. If I try to edit d1, it shows as red, which means, I guess, that Fusion 360 cannot resolve the parameter 'length'.

If I enter a new User Parameter 'length', d1 is then ok.

What appears to happen is that the sketch dimensions are copied across with their expressions, but any attempt to recalculate them will throw an error. The only answer is to enter all the User Parameters again in the new model.

Or here's another workaround. Make a copy of your original model. Delete all the bodies and sketches. Clear the timeline. Then, all that remains is the parameters. You can start from there. As you say, once you have pasted in the sketch elements, you need to make the relevant point coincident with the origin to make it fully constrained.

Julian 

[chrisplyler]

User Parameters are only referenced by you in a sketch. They aren't stored in the sketch. You can copy and paste the sketch into a new design file, but that doesn't mean the User Parameters come with it. You'll have to set them up as desired in the new file.

[TrippyLighting]

@chrisplyler If you edit the copy/pasted sketch, you'll find that the parameter is still referenced in the sketch dimension. It just isn't a user-defined parameter anymore (as its a model parameter now) and as such is does not get the "fx" symbol in the sketch.

[chrisplyler]

Yup.

[davebYYPCU]

Try the Dervive tools, it will do Parameters, with or without the sketch, or 

insert to current Design, will depend on source sketch structure though.

Might help....

[jeff_strater]

OK, I am gonna have to dig into this one a bit more.  The experience I see is:  On Paste, the parameter references are there in the copied dimension, and compute OK, but the parameters are NOT in the design, so I don't quite know how that is happening.  Perhaps there is some hidden parameter being dragged along for the ride.  But, again, I need to dig a bit deeper.  More later.

[juliangall]

I look forward to hearing what you find out. Thanks.

Julian

[etfrench]

If you have the sketch in a component, then copying the component to a new file will bring the user parameters to the new file.

[jeff_strater]

turns out this is a known problem.  It was reported a while ago:  https://forums.autodesk.com/t5/fusion-360-design-validate/bug-coping-sketch-between-documents/m-p/69...

Fusion bug FUS-31666 exists for this.  Going to try to push to see if I can get a fix planned for this.

[chrisplyler]

Sending doughnuts to you now Jeff.

[davebYYPCU]

And what would Chad say?

[chrisplyler]

Chad will say anything to leave the office early.

[1johnmurphy]

Has this been fixed?  I still see the same behavior...

[rbackman07]

Came here to report the same bug.  but Also found a workaround/hidden workflow. once you paste the sketch press ctl-b to compute all.  if you have the same parameter names in your new design it will connect those and update the sketch. but if it the design doesn't have the parameters the sketch parameter at least shows up as a Model parameter