On Tue, 2010-12-21 at 09:58 -0600, Jeff Epler wrote: > emc can use the encoder index-enable feature in two ways: at the > beginning of spindle-synchronized motion, and at a specific step of > homing. > > Specific machines might use index-enable in other ways as well. For > instance, I know of rotary toolchangers with quadrature output and > index. A ladder program would probably use the index feature once at > the first toolchange to establish the absolute position of the > toolchanger, and from then on use the position of the toolchanger's > encoder to know what pocket is currently prepared. > > Jeff
What was a little confusing is that the HCTL chip appears to have the index reset the counters on every revolution. It made me think that was a normal thing to do, then have EMC2 keep tally of the index count and the between index count to derive the overall position. I think you are saying that resetting the counters with an index is a means to modify the position for certain circumstances, but the contents of the counter * scale is the machine position. I'm thinking of setting up a dummy counter in hal and see what happens when I mess with it. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Forrester recently released a report on the Return on Investment (ROI) of Google Apps. They found a 300% ROI, 38%-56% cost savings, and break-even within 7 months. Over 3 million businesses have gone Google with Google Apps: an online email calendar, and document program that's accessible from your browser. Read the Forrester report: http://p.sf.net/sfu/googleapps-sfnew _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
