I've used a laser printer (600 dpi) to print disks with up to 400 lines per revolution on 2 inch diameter disk. used for a tachometer, drawn in Autocad and printed on transparency film. Newer higher resolution printers whether laser or inkjet should work very well to print 500 or more lines per revolution. With another optical switch positioned so the pulses are 90 degrees out of phase and you have a quadrature encoder.
Due to the amount of work involved I'd recomend U.S. Digital. They make very reasonably priced encoders. Unless you have more time than money. Dale Kirk Wallace wrote: > This may be off topic, but due to the open source nature of linux and > EMC, I'll take a chance. > > I have been trying to figure out a method that a typical EMC user could > use to make encoders. > > One method might be to use Lighscribe to burn a rotary scale image to a > CDR disk, but cd's are reflective and practical encoders need to be > transmissive. Maybe an emulsion used for circuit board etching could be > used on a clear CDROM? Two disks would be needed, one for the scale and > another for a mask. > > Another thought is that if a CDRW laser assembly could be modified to > scan a stationary target, you could apply the magic CDR coating to a > substrate and then use the CDRW scanner to write and read absolute > position data to a rotary or linear scale. Sort of like the helical scan > for magnetic tape used for video or data backup. > > The main idea is to trade effort for cost in the pursuit of accurate > position feedback for EMC motion control. > > Any thoughts on this? > > Kirk > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys-and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
