If it's infrared you won't see it until you don't see anything. With lasers don't sit around with a power supply trying to make a laser come on. Does anyone know where to buy these (stepper motor + lead screw assembly)? They're a beautiful design - I'd like to build a 9x9cm 2-axis plaster-of-paris (google for local name) engraver for metal casting. Parts of the housing are aluminum, others are (I think) mild steel, based on their magnetic behaviour. The magnet is connected directly to the threaded rod, although the rod does not carry the magnetic field. I've never seen a motor of this design before. I've just taken apart one of the "Stepper Motors" and it consists of a cylindrical magnet surrounded by two highly-wound coils, one around (I'm presuming) each pole. (Motion control, anyone?) I can't remember if they can hold a load in position like a stepper. DC motors with high-resolution encoders (I've found more in printers than CD/DVD drives) with appropriate control firmware give more control than the small stepper motors or hobby servos, plus, assuming there isn't too much friction, you can record movements from the encoder/controller, and play them back. A few notes based on recent research and experience : 1. I've just learned the right way on the fourth CD Writer I've disassembled, but your instructable has clarified several points.
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