On Sun, 2008-03-09 at 16:29 -0700, Curtis W. Moore wrote: > If I added pulses can it be done? My encoder is just a homebuilt opto > switch. Cutting out a new wheel with more slots/holes would be trivial. > Can EMC thread with just one train of pulses? Ie use just one pin of > the parallel port?
Just in case, the parallel port is fairly limited in speed. I am guessing 20 to 30 kHz is maximum. If you make a disk, the number of slots per revolution will be limited to something like 30kHz/3k RPM = 10 slots (?). Like John said, you should have two channels, one for index, another for A and B. You can get A and B from one channel of slots by offsetting the B sensor by 1/2 slot spacing. For more slots or speed, I think a Pluto servo card would be an inexpensive solution. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending) ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
