On Jan 19, 9:55*pm, "anorton"
wrote:
"axolotl" wrote in message
On 1/19/2010 7:43 PM, Pete C. wrote:
Kevin Gallimore

If you really want to do it mechanically without moving two axes
independently, you need two rotary tables mounted one top of the other. The
top is offset by half the distance between the foci of the ellipse. Then
rotate the two tables at the same rate.

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.

jsw