I recently bought a used SpectraLIGHT benchtop milling machine. I didn't get the computer, but I did get the control box, all steppers, and the spindle motor. From what I've read the control box is worthless without the computer, so I may reuse the case for what I have.
I was contemplating scrapping the steppers for something else, as I haven't found much info on them. I have a few similar motors that I thought of using, but then decided to get out the ohmmeter and check a few things. Turns out there really isn't any magic to these steppers at all. It's just that nobody seems to have posted much about them. I don't know if all of these machines are the same or not, but here's what I found about these.
Sorry. No pics yet. I'll try to get some before I really get into it.
There is an 8-pin connector on each motor. Of these, it first looks like one broke when pulling the connector. I've read other stories where the owner thought they broke the pin off, too, so it wasn't just me. Pulling the shroud back from the connector on the wire harness reveals that the 8th pin is a key. So, I didn't break anything after all. The motors have 7 pins remaining, while the 8th was broken off to make room for the key. On the motors I have there are no markings, but the female connector seems to have pin-1 opposite of the key, so we'll go with that. I haven't figured out the polarity yet, but pins 3, 4, and 5 are one set of windings, with 4 being the CT. Pins 1, 2, and 7 are the other set of windings, with 2 being the CT. The windings seem to be about 0.8 ohms end to end. Haven't figured out much more about them yet.
My other motors are 100 on-in, like these are supposed to be, and are almost exactly the same size. But my other motors are the old "HP printer" steppers so they have a much higher DC resistance, 8 ohms across the full winding.
I'm not sure if it's possible to get an accurate estimate of the current needed for these secret steppers or not. I haven't found much data on them, but would prefer to use these, as the couplers won't fit my other steppers.