Fusion
Edit your sketch and place a Coincidence between the center of the ellispes and the origin and then you can modify the angle to suit. Remember, you cannot dimension a sketch angle to 0 degrees. If you want this, delete the angle and add a horizontal sketch constraint to the ellipse axis.
John Hackney, Retired
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Is this what you're trying to do (constrained so it rotates without distortion)?
I made the line with a 3 point rectangle so automatic relationships are not horizontal/vertical but perpendicular and parallel (i.e. relative between entities), then made one corner coincident to the ellipse and one to 30° line:
But still it may happen that during rotation Fusion swaps between two possible solutions and rectangle go outside of ellipse.
By the way, shouldn't you make the line tangent to the ellipse to avoid this small area and have smooth shape?
Hello,
So, I wanted the interior ellipse because with it I could make that either a quarter note (filled) or a half or whole note (center missing).
The intent is to have a single sketch that I can extrude in different combos to get different notes. The reason I want a sketch is that I need to modify groups of notes to make them eight, sixteenth and to connect the notes with a beam.
The reason I don't have it tied to the origin is that it will be placed on a musical staff.
I have updated the file so you can see what the end result should look like, but right now I copy the extrusion and rotate it instead of doing it via a sketch.
