I think mice parts a alex has mentioned are the cheapest. lawrenceG has done some extensive testing http://members.shaw.ca/swstuff/mouse.html
I have played with this also - http://www.electronicsam.com/images/KandT/servostart/Fastermouse.png They work very well. My limit at the time was how fast the computer could count. We ended up going with usdigital parts - wheel and sensor as you can get both for under $50 http://www.electronicsam.com/images/KandT/servostart/Encoder.JPG sam On Fri, 16 Feb 2007 13:03:06 -0800 Kirk Wallace <[EMAIL PROTECTED]> 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
