I've been shying away from the servo setups, since looking at the FlashCut page and noticing that the servo packs were +$2500 over a similar stepper pack. This afternoon I did a little more research, and it seams like I can piece it together for much less than that.
For example
http://www.seanet.com/%7Edmauch/ has 600oz-in peak torque servos for $159 each. Would twin 600's on the X, and a single for the Y and Z be "more than adequate"?
However I know even less about servos than I do about steppers (except how they relate to RC airplanes), so have lots to learn there.
Can Mach1 control servos?
I've had problems finding ball screws with the same pitch at all the diameters, I'll have to keep looking. I have not found any local shops that know anything about ball-screws or linear shafts, so have to go off of the MSC and McMaster web pages for the most part.
The truss table is a good idea- I've been considering it too, but it seams like a lot time to get it dialed in.
I was hoping that if I could get the gantry to run true, I could just face the MDF table top to get it flat to the gantry. I expect the table to sag some over time, but it should settle in eventually. I figure I can shim under the main sheets of MDF to bring it back up to near flat if required.
Thanks for your time!
Zeph