I used the black "dummy" CD or DVD (cant remember which) that comes in a new stack of disks to make my encoder disk. I cut 20 equally spaced notches about .15 inch deep and made one of them about .45 deep for the index. I used TTL output optical interrupters to read the disk with 2 for quadrature and one for index. The disk is very easy to cut and it runs true without worrying about it wobbling. I cut mine on my cnc'd Millrite with a cnc rotary table but you could easily lay out and file the notches in less time than it took me to write the code and set up the table on the mill. I mounted the interrupters on very thin little aluminum plates and held them onto the machine with supermagnets. When I had confirmed the timing of A and B for quadrature and made sure the index wasn't picking up the shallow notches I put a couple of drops of superglue on the edge of the aluminum plate. When it had set I removed the magnets and drilled the plates for mounting screws with complete assurance that they would be rigidly mounted in the right place.
I used this technique on the spindle of a Jet 9 x 20 and also on my Monarch 10EE. They are both very happy. Cecil ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
