I stumbled upon this thread and got a chuckle. Last weekend I finally got fed up with my KMB1 always shutting down on me and I ripped out the guts. I've finished drawing up the schematic and am working on a retrofit as I write this. In fact, the way I found the post here is that I was looking for photos of what solenoids are in the head because I was curious about a wire (not taking my head off right now).
In my case I'm setting up the system to use LinuxCNC. I'm keeping as an analog feedback because I'm less than thrilled with step/direction. I am using Granite VSD-E servo amplifiers and an Electrocraft for an A-Axis. I am using a Mesa Electronics 7i77 as the interface board (remember, this is analog, not step/direction). I am not painting the machine because I really don't have the room or the desire right now. Someday I might do it though.
This is an interesting project and I think the Hurco makes an excellent starting point for someone that wants a nice CNC. It is a far better decision, in my opinion, to start with this than to convert a manual machine. KMB-1 machines can be purchased for near nothing now. In fact, they are often at scrap prices. And, yet, they have ballscrews, lubrication setups, servos, etc.... A great foundation.
Interesting that you are keeping the arm and console. I am not committed to keeping it yet. I was thinking of something that came off the top of the machine because space is a premium in my garage... I'm also deviating from your approach by leaving the computer in the cabinet that used to have the MPU and other boards.
Anyhow, looks like your project is coming along well. Good job!
Project Location: Sunnyvale, CA