good idea,  thanks for the good feedback.

yes, they are probably 10v units but it has a 5' tall 24 x 24" cabinet with over 100 relays and several 20x20" boards populated with discrete IC's that all work together to give it some type of velocity feedback.
This is cnc in its earliest form.   It uses fanuc velocity control drives on the spindle motor.  I might be able to figure out the servo controls.  It is a reel to reel tape drive to load the programs.

i may have bit off too much on this one.  The dirves are so large that I am not sure if I can find drives for them in my budget range.

I have an updated parabola if interested send pm

IK2J,

Here is a similar size lathe I converted.  http://www.machsupport.com/forum/index.php/topic,11537.0.html 
Good luck with your project.

I have gotten the bug to start work on an old MicroStar N1 lathe.

It has an old Fanuc system 5 controls on it. (1979 vintage) The spindle motor is a 7.33 hp dc drive.  It is big at least 18" long about 8" diameter.
I haven't dug into the servos yet to see exactly what I've got, they are DC but that is all I am sure of.

Do you think I should try to get the existing spindle drive to run or replace it with something else? Do you have any ideas on what type of drive to use on it?
What would you use for the servo motors? They are big about 6" diameter 10-12" long. I would guess 3hp or more.

Any documents on this would be nice also, Ha Ha wishful thinking. I have scoured the web and find nothing. Even Fanuc System 5 information is scarce.
Arnie

That was so long ago, I don't even remember the probe.
Sorry

ok,  what was it?  So we can all know?

Very nice looking panel!
One recommendation,  it looks like you may have your power daisy chained from the source. 
It would be best if you ran wires from the source to each Gecko individually, both - and +.
I am not a fan of the slide on connectors on your fuses,  if there is any way to get a bolted/screw connections that is best.
Very nice looking layout!

Thanks Rich!