Does anyone have any idea what those two (presumed) nickel-coated neodymium magnets are for? Fine positioning? I'm just really curious because it looks really cool. If it's a writer-laser you may see something as your retina burns out. 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. The speed of writing discs with Nero 9 Free depends on the capabilities of the optical drive. Nero 9 Free is a multimedia suite that is capable of creating and writing on DVD and CD optical discs, assuming the the PC is equipped with a CD or DVD burner. 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. Free software that can burn/write data on CD or DVD discs. 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 believe that CD writers are now very difficult to get hold of and DVD writers are available for 1520 for a desktop. 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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