Bridgport clone Retrofit

Group

I'm planning a Bridgeport clone (Alliant) retrofit. I have some
servo motors from an old Bandit retrofit on a Mori Sieke (sp?). Dana
7.5A 90V.
I'm thinking about using the Flashcut signal generator and Gecko G320
drives. I also plane to install ball screws.

I think the servo motors I have are big enough to direct drive the X-
Y. Any comments on this? How about the knee?

What methods are people using to couple direct drive ball screws. Is
a keyed sleeve adequate? What about misalignment?

What size power supply do I need? 7.5A X 3 = 22.5. Is it that
simple? I assume that 90V is the max drive voltage for the motors
and that
lower voltage will work ok but limit torque and speed. True?

So many questions. Well, any light the group can shed will be a
great help

Thanks
Marc Davis