Help with CNC "router"

[Thermal]

That's a really heavy duty gantry you got there. Honestly, if you can restore the ballscrew, linear rails/bearings and various other parts you might be able to sell them or the gantry assembly as a whole for a pretty penny and start a CNC router build from scratch using NEMA23's for your steppers. That might be a suitable alternative over working around that behemoth for your application. Ballscrews are real nice but you can get pretty similar performance out of a rack and pinion.

My team has had a real good experience with the Gecko 540 and the pre-fab'd parts from cncrouterparts.com. They're all designed to interface with 8020 or T-slot extruded aluminum.