"Karl Townsend" wrote in message
anews.com...

If you tilt the blank up at an angle a long vertical endmill will cut
a mathematically correct ellipse. The major axis ends will be beveled
so the thinner the stock the better it works.
...

Glad I got a CNC so I just put in the Gcode and cut.

"I THINK" if you also tilted the head, the above suggestion would give you
an elipse with square sides.

Karl

P.S. You'll have to raise/lower quill as you rotate to keep tool at same
depth.