associative loft sketches not updating

[Anonymous]

This is likely a beginner question, and maybe a little of expecting Fusion to do what it can't.

I have a lofted shape made from several sketch profiles, all of which I think have coincident constraints on the midpoints. After I have made the loft and when I go back and edit the center-line for example, the lofted shape does not adjust to the new curve radius. And, the center profile does not follow it although a coincident constraint is applied to it and the centerline curve.

Am I expecting Fusion do be doing more than it can do, or am I doing something wrong here?....

[jeff_strater]

thanks for sharing the model, @moovmedesign , but I'm a little unclear about what edits you are making that are not updating the loft.  I tried editing the profile sketch of one of the profiles, and it seems to update correctly.  You say that you edit the centerline sketch.  Remember that a centerline rail is just a recommendation.  In this design, that centerline sketch is just a single arc, so the only edit you can make is to change the radius.  However, the ellipse looks like it is not constrained to this centerline, and the loft is required to pass through the profile, so it essentially ignores the centerline:

[Anonymous]

Hi Jeff, I am unable to apply a coincident constraint at the intersection between the center ellipse profile and the center-line curve - hence the issue with it updating. I am doing something wrong for sure... not sure what though. The other thing was wondering/wanting to do was to move the ellipse backward or forward in its sketch plane and have the associated center-line line curve to update/follow it. I am unable to any of these things. I thought that once a coincident constraint was applied between sketches, each would update to the change....

[jeff_strater]

The problem here is that the coincident constraint is between the ellipse center and the sketch origin, not the intersection of the centerline and the ellipse center.  In the screencast below, I re-establish the correct coincident by moving the centerline, editing the ellipse sketch, disconnecting the ellipse from the sketch origin, projecting the intersection of the centerline and the sketch, and then making a coincident between that intersection and the ellipse. That seems to behave as I think you want it to.

[Anonymous]

Ahhh, that's a trap for young players! Thankyou.

The other thing I wanted to do here was to be able to translate the ellipse forward or backward and have the center-line curve follow it. Is that at all possible, now or in the future?... 

I can understand when the guide curve is adjusted the profiles follow, but the idea of having a coincident constraint between sketches means the operation should be interchangeable over the connected sketches, and should work both ways shouldn't it?.. In this case the adjustment changes across the 2 separate sketch planes so having the freedom to adjust either sketch is extremely useful... Is that possible?

[TrippyLighting]

I believe this is a very deceptive bug I've reported here!