Rotating about an ellipse

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#1

Hello everyone!

So I am trying to divide an ellipse into 24 segments.

To do this, I tried creating lines for the center of the ellipse, but it does not evenly space the segments because an ellipse has several different radius points. The lines I drew came for one radius point at the center, and therefore does not evenly divide the ellipse.

I want the lines creating these segments to be perpendicular to the ellipse at each point, but I don’t know how to do this. Is there a way to rotate lines around an ellipse (multiple radius points) instead of a circle (one radius point)?

Let me know if this does not make sense!

Thank you,

Fletcher


#2

The guidelines in this screen shot as well as the horizontal and vertical lines pass through the edge segments at 90°. Is that what you want?

No matter what the spacing along the edge of the ellipse, lines placed at 90° to the edge segments will not intersect along the midline of the ellipse.


#3

Yes, that’s what I want. I’d also like the arc between the lines to be equal. So all of the arcs created by the lines are, for example, 2 feet.


#4

Like this?

I used Fredo’s Divide Edges which is part of FredoTools.


#5

Yes, that looks right


#6

Pretty sure I learn about one new thing a day from Dave!! :joy:


#7

so is that a spline traced over a scaled arc?


#8

No. I drew a circle with 96 sides and rotated it so that edges were perpendicular with axis lines. Then I scaled it to make an ellipse.


#9

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