I went back to the PDF that SWATH posted here: http://www.cnczone.com/forums/mikini....html#poststop
and got a few answers...
Max RPM suggested is 10
300 Watt stepper with 850 in-oz of torque
Repeatability of 28 arc seconds
Sealed for use with flood coolant (good to know!)
It also gives me a few more questions, though...
The center in the PDF:
The one I got:
I sure like the one in the PDF better! It is at a fixed (and assumed correct) height for the table when it is mounted vertical. It has an easy to use brake on the center - I can't even tell if mine has a brake.... Also a pet peeve, the nut to adjust the height of the center is even bigger than everything else on the machine - another wrench that needs to hang out (though I guess it never needs to be adjusted once it is right?)...
This PDF shows it mounted on the left side of the table - I can NOT do this with the items I was provided (the pic does appear to not be electrically hooked up, though, I don't see any wiring coming from the stepper).