Yes, DC motor, but I've not got a tacho. Could be an excuse to buy one though...

I looked at it again last night, and powered the control box up. It has one 36VDC supply, but I can't get into the other smoothing capacitor (it's rated at 25VDC) to see what the other supply is without some major dismantling. The feed for the motor appears to go to the speed control board on the machine, then down to the motor, and the motor has 3 wires (I'm going to gues possibly some kind of thermal cutout…).

It does seem to power up OK, but the motor switch does nothing, so I'm guessing it's also controlled by the controller.
I'm going to have a rummage and see if I can find an old XP computer, and see if it will run.


I'm still undecided what to retrofit it with. Arduino/GRBL is the cheapest option, but I am tempted by a DDSCV, as it seems a bit less fiddly to use and comes with an interface.