Fusion
Please attach your model containing the sketch in question. It will help me see your steps better and see what I can find. If I duplicate it I may not do the same steps. If you do not know how to attach your Fusion 360 model follow these easy steps. Open the model in Fusion 360, select the File menu, then Export and save as a F3D or F3Z file to your hard drive. Then use the Attachments section, of a forum post, to attach it.
Edit: In my experimentation I have found that when your break or trim the ellipse you loose the relationships to the major and minor axis created with the ellipse. These axis seem to be critical to the constraining of the ellipse and cannot be replaced with simple construction lines. In your sketch, the ellipse arc is constrained, it just does not change color or the sketch does not show fully constrained due to this. The ellipse arc is not going to move. I agree, it would be nice is the indicators did appear and this truly my be a flaw in the sketcher but you have what you need so you can move on.
John Hackney, Retired
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ellipses, and especially trimmed ellipses, are not well handled in the Fusion sketch solver. I suspect the link between dimensioning the construction lines and the ellipse is the problem. Yes, your constraint/dimension system fully constrains the sketch, and the status today is incorrect. if you want to fix it, dimension the ellipse directly:
Jeff Strater
Engineering Director
