I recently bought a CNC mini-mill at an auction. It is fitted with steppers on the three axis. The X and Y are the same, and the Z is a bit smaller (physically). All the markings were removed from the motors and they are painted flat black. Yet another reason to hate proprietary hardware. The machine was originally designed to use a custom controller which is missing.
My question is, can I figure out what voltage the motors were intended to run at? Does the coil resistance offer any clues? I have a good quality multi-meter, and I have already reverse engineered the wiring. I don't want to fry the motors though.