+/- 15V Supply

I'm about to finish up my first CNC project (a grizzly mill). I've been
stalled the last few weeks trying to find/setup a suitable
power supply (I'm using 24V servos).

This may be over kill in some respects, and not quite as much current
as I'd like in other respects (I'm planning on building an unregulated
type supply soon) but I've picked up a supply that might work, and
wanted to
find out if the gurus on this list had any advice using it.

It's a rack mount transistor devices military supply, with
a variable 15 amp + output and a variable 15 amp minus output
(The outputs are variable from 0-18V and can be current limited).

The supply seems to work great, but obviously I need somewhere between
24 and 30 volts. Can I feed the -15 volt side of the supply to my
G320's negative supply terminal and the and the +15 volt terminal to the
+voltage side of my Geckodrives?

I'm not paralleling this with any other supplies for motor drives
or anything special. Since there is 30 volts potential between
those terminals, I'd think that I could use the + & - terminals and
leave the "0" terminal alone.

The supply is around 75 pounds (heavy!) with a huge transformer, four
giant caps,
a bunch of heat-sinked SCR's and some circuitry.

The only "hitch" I could guess might be some kind of grounding issue
with the AC
grounds or something (Obviously the computer and the motor power are on
the same
AC circuit).

I'm not an EE, so I wanted to pose the scenario before I blew up my
drives...

Thanks,

murph