All, this is something I've had occur in previous designs, and finally put together an example that shows it.
Can someone help me understand why the upper curve is showing as unconstrained?
[Edit] I should mention, the "LOWER" sketch shows fully constrained. The upper was built the same way, just using "Equal" constraints for member length, and direct reference for curve radius.
Not sure what is going on with that sketch, but Attached is an alternative technique.
Looks like Fusion sometimes has issue using reference dimension.
In the last example I used the original Parameter name rather than create a Reference Dimension...
I've had a few sketch with curves where I have this situation pop up: Everything looks be fully defined, but it still shows unconstrained for some reason, and I can't ever find the root cause. Wasn't sure if I was just missing something obvious.
On your first example, does it show fully constrained on your computer? Still shows unconstrained for me. Your second "Or This" file does show constrained though.
[Edit] Didn't see your edit. If I directly input the dimension (4) AFTER linking it to the other curve, it still shows unconstrained. However, If I redraw the curve and input the dimension directly at first, it'll show constrained. Interesting little bug.
Your issue with the Upper Sketch Arc is because the lower sketch arc is duplicated. Remove one of them and the top arc resolves to be fully constrained.
John Hackney, Retired
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Thanks John, I appreciate the screencast. I'm a little confused on why that makes a difference though.
That second sketch curve is just from the visible "LOWER" sketch. I projected the "LOWER" profile into the "UPPER" sketch as construction, and created a driven dimension (d6) off of the projection. If I hide the "LOWER" sketch, and delete the projected lower curve (d6), why does the upper curve suddenly become constrained?
I also noticed that when I delete that curve with the driven dimension, in the parameters manager the d6 reference shifts from the sketch container, to the Model Parameters container, and the sketch fully defined. But I don't understand the significance of that.
The only thing I can say is that your are using a reference dimension for the top curve and since there are two arcs on the bottom curve, the reference is being picked up incorrectly. I am not the one that created the sketch algorithms but it is a proven fact that double up entities will give you issues. If you had not accidentally created the double arc on the bottom curve, you never would have seen an issue.
John Hackney, Retired
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