(pardon the late reply, was on vacation)
try the "ballcut" program at http://www.myvirtualnetwork.com/mklotz/.
All Hail Rube Goldberg!
> I would like to know if anyone could tell me a good way to but a 12"
> radius on something with smaller lathe. I have a 9x30 bench top. I am
> trying to make the lower anvils for a english wheel I am making and
> the radii have to be correct for the metal to stretch correctly. I
> have different radii 12", 8 1/2", 6" ect.
> Thanks for any help