In a CNC system there are 2 major components ... Over time, the un-lubricated Z axis linear ball bearings had worn 4 gnarly looking equally spaced grooves into the linear rails.

The CNC Router frame is made from aluminum, is very rigid and has a 2′ by 2′ cutting area. All axes glide smoothly on THK linear bearings and are powered by NEMA 23 motors driven by Gecko 540 ...