http://groups.yahoo.com/group/Technical_Insanity/ Technical Insanity - Holiday Props & FX Sun, 08 Nov 2009 19:06:51 GMT lex_allen99 http://groups.yahoo.com/group/Technical_Insanity/message/9178 http://groups.yahoo.com/group/Technical_Insanity/message/9178 Yep that's it. there was a RPM sensor that told the pic the speed and home position. This raster is modulated by turning on/off the laser beam. T Sun, 08 Nov 2009 17:19:09 GMT dbell@... http://groups.yahoo.com/group/Technical_Insanity/message/9177 http://groups.yahoo.com/group/Technical_Insanity/message/9177 To answer both latest posts, I suggested two cylindrical lenses in order to get an expander that would form a beam with a rectangular cross-section, rather Sun, 08 Nov 2009 05:12:21 GMT David Petrone http://groups.yahoo.com/group/Technical_Insanity/message/9176 http://groups.yahoo.com/group/Technical_Insanity/message/9176 If you are just trying to illuminate a static pattern, you could start with a laser level that projects a line. They a single mirror that moves back and forth Sun, 08 Nov 2009 04:39:48 GMT Doktor Calamari http://groups.yahoo.com/group/Technical_Insanity/message/9175 http://groups.yahoo.com/group/Technical_Insanity/message/9175 Well... A cylinder is curved along one axis, so you could curve the glass along both axes... which would result in an ordinary convex lens. I'm not sure that Sun, 08 Nov 2009 03:25:23 GMT coffinbound1 http://groups.yahoo.com/group/Technical_Insanity/message/9174 http://groups.yahoo.com/group/Technical_Insanity/message/9174 I understood everything up to this post. Not sure what you mean by "two cylindrical lenses". I know what a cylinder is, just can't visualize how you have them Sun, 08 Nov 2009 01:58:22 GMT David Bell http://groups.yahoo.com/group/Technical_Insanity/message/9173 http://groups.yahoo.com/group/Technical_Insanity/message/9173 Ah!! I'm sure you have it with 8 differently angled mirrors. Again, why not two croosed cylinderical lenses? You'd get the rectangular beam pattern, without Sun, 08 Nov 2009 01:03:33 GMT Doktor Calamari http://groups.yahoo.com/group/Technical_Insanity/message/9172 http://groups.yahoo.com/group/Technical_Insanity/message/9172 ... "The head is an octagonal prism, with a small mirror on each lateral face. Each mirror is mounted with different angles, giving different reflection angles Sun, 08 Nov 2009 00:01:15 GMT coffinbound1 http://groups.yahoo.com/group/Technical_Insanity/message/9171 http://groups.yahoo.com/group/Technical_Insanity/message/9171 You wouldn't by any chance have a link for what you speak of, would you? Sun, 08 Nov 2009 00:00:10 GMT coffinbound1 http://groups.yahoo.com/group/Technical_Insanity/message/9170 http://groups.yahoo.com/group/Technical_Insanity/message/9170 OK David, that is just too cool! Thanks for the link. Sat, 07 Nov 2009 23:59:18 GMT David Bell http://groups.yahoo.com/group/Technical_Insanity/message/9169 http://groups.yahoo.com/group/Technical_Insanity/message/9169 Something like this one? Http://tinyurl.com/yq6fkr I don't see how he's getting 2D scanning, though. The spinning mirror will create the horizontal scan, but Sat, 07 Nov 2009 22:23:43 GMT lex_allen99 http://groups.yahoo.com/group/Technical_Insanity/message/9168 http://groups.yahoo.com/group/Technical_Insanity/message/9168 there was a system using mirrors like 16 all at a different angle and a pic to control on/off Sat, 07 Nov 2009 19:12:55 GMT David Bell http://groups.yahoo.com/group/Technical_Insanity/message/9167 http://groups.yahoo.com/group/Technical_Insanity/message/9167 It occured to me after posting, that the two speeds don't havt to be greatly different. Adjust the frequencies so they have no mutual factors, say 100 and 101, Sat, 07 Nov 2009 18:51:24 GMT David Bell http://groups.yahoo.com/group/Technical_Insanity/message/9166 http://groups.yahoo.com/group/Technical_Insanity/message/9166 Key is that one mirror runs much slower. You always get Lissajous patterns, but if the ratio is high, the pattern looks like a raster scan. (One vertical cycle Sat, 07 Nov 2009 18:40:58 GMT coffinbound1 http://groups.yahoo.com/group/Technical_Insanity/message/9165 http://groups.yahoo.com/group/Technical_Insanity/message/9165 I thought this method created geometric shapes. I didn't think it could be used in a "panning" fashion. Hummmm. Sat, 07 Nov 2009 17:37:53 GMT David Bell http://groups.yahoo.com/group/Technical_Insanity/message/9164 http://groups.yahoo.com/group/Technical_Insanity/message/9164 Two small motors, each with a mirror at an angle on the shaft. One spins much slower than the other. Laser from one mirror, onto the other, then through the