> Also, any hard drive that does NOT have a stepper motor on the > outside is a "voice coil" type. These have an expensive neodymium > super-magnet and deflection coil setup, useful for high speed high > precision deflection. Just glue a mirror (or the laser!) on > it and use a spinning mirror for the x scan. > -Roman I thought about doing this to make a pen plotter - then realised I've nothing desperately important to plot ;-(( Good idea about the laser though and I've found a novel use for the magnets, TTYL about it Have you ever tried the mirror mechs from Oatley ? Thinking of re-stocking on their bargains/surplus soon and wondered if it was worth getting one to muck about with -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics