Why not consider a single phase 220 motor? Mills don't have a high starting
torque requirement, and mills have more than adequate gearboxes for speed
selection. My 1929 Kempsmith has something like a dozen spindle speed
selections with a flip of the levers.

Besides, horizontal mills were designed for constant input shaft speed. If
you change speeds with a VFD you will affect the feed rate at the same time
as the feed gearbox is run from a PTO off the input shaft. (at least on the
older machines).

Tony


"spamkill at charter dot net" wrote in message
...
Hi
I am thinking of getting a rotary phase converter from Temco to drive
my Cincinnati mill. In particular I am considering the 6500-11KW or
6500-15KW units. http://www.phaseconverter.com/
Has anyone used these and would care to comment on them. I believe
that if I went with these I would have enough to also run a 3ph lathe
if I found one I liked. Thanks