servos,geckos,and power supplies

It's a happy day in our household as we just came back from the tool
store, and I will be picking up my new benchtop milling machine in
about 10 days. The machine is a 2 hp Rong-fu clone with a 4 and a
half inch round column. I have spent the last two years learning the
ins and outs of benchtop CNC milling machine conversions while
converting my Sherline milling machine to CNC control. I'd
eventually settled on a very homemade system consisting of RadioShack
transformers, and superior electric Sd 200 drives which were powering
Pacific scientific 180 oz/in stepper motors. It was easy to
calculate that necessary power in this system because the S/P 200
drives could sink no more than 2 amps of current, and the stepper
motors would draw no more than 1.2 amps of current. Therefore
transformer with an output of 24 volts at three amps would be
sufficient. So my design had one transformer whose output ran
through a rectifier bridge through large capacitor and to the driver
directly, all replicated three times and run from the parallel port
of the PC using EMC.

On the new machine I wish to start right away with servo
motors. I have already purchased two servo motors from eBay. I
attempted to test the motors today and using a 12 volt power supply I
recorded five amps of current and a driving voltage of approximately
12 volts and was able to lift a 60 ounce mass at a distance of 1 in.
from the central line. I've yet to test the encoders on these motors
but they appear to be simple quadrature encoders. The shaft appear
to be spinning somewhere in the neighborhood of approximately 1000 to
2000 rpm under no load at 12 volts with well under one amp of current
registering on the gauge. My calculations are very rough and should
underestimate the real specs of the motor.

My question is; if I am to use these motors to drive the
axes, and I anticipate a maximum current per axes of approximately 10
to 15 amperes, and anticipate using gecko drivers, where can I find a
transformer with sufficient output current to feed three of these
drivers. I realize that this question may have some inherent
problems. I had anticipated that a worst-case scenario would be all
three axes drawing 15 amps of current simultaneously. This would
create a circumstance of 40 to 60 volts flowing at 45amps of current,
for power output of nearly 3hp. The difficulty is finding a
transformer capable of flowing that level of secondary current. Now
what I am wondering is how much output current is necessary at the
transformer assuming an output voltage of approximately 50 volts AC
(run through a rectifier with DC output slightly higher) given the
current draw of these motors. And based on that necessary current
and voltage, does anybody know all the place that sells transformers
like this relatively inexpensively. Obviously the large capacitor
and rectifiers I will self assemble.

And by the way while were on the subject of CNC machining,
I've asked this question before but I forgot the correct answer; I
had had numerous problems with EMC running apart up until about the
third to the last line of G. code, and then the program discovering a
minor syntax error, and locking up. Is there any rapid and the easy
way to verify a part program before running it. Specifically is the
back plot feature capable of performing this function. And it's all
what is the procedure to run back plot under EMC.

Thanks again as usual for all your help

(and please excuse any grammatical errors, as I am attempting
to get the voice to tax to work well, and it appears to make more
than its share of mistakes)
Bill H