I just finished a complete retrofit on a 1985 RoboTool mill originally fitted with CVM-1 controls. It came out well but was a complete rewire job. I ended up ditching the original NEMA box in favor of 2 saddle boxes, primarily due to floor constraints within my shop. I used the original motors but threw out the resolvers in favor of quadrature encoders. Everything else in the control is new. Power supply, communication boards, amps, relays for the way lube, coolant pump, and spindle brake. All new. I spent less than a grand on the iron with good screws and motors, sold the original control to somebody who wanted it as a spare to get half my original investment back, and then have no more than $2k into the retrofit. The machine is not screaming fast because the original servo motors are small, but I can manage 80ipm in the X, 90ipm in the Y, and 100 IPM in the Z which is good enough for my needs. My new servo amps could handle more motor, and I might upgrade to something a bit larger in the X and Y eventually. For now, the machine is quiet, accurate to 0.001 repeatably, and is going to make me a boat load of money. For relatively short money I don't think you could do much better. The base machine iron on the old RoboTool is a good design and I get 36" of travel in the X, 15" in the Y, and 5" in the Z. Good luck.