On Friday 24 November 2017 11:04:16 Peter C. Wallace wrote: > Why dont you just make an index mark/pointer on the headstock and > chuck This should be hand settable to less than a degree of chuck > motion then just note the motor encoder count when the chuck is > aligned with the mark and then rotate the motor until the chuck has > turned say 20 turns. This should give you the ratio to within 1/7200 > which should be better than needed. if thats not enough, just do more > turns, you could get to PPM accuracy is less time than it takes to > futz with doing this is hal > > Peter Wallace > Mesa Electronics > That might be one way, Peter, and likely less time. But accessing the motor shaft is going to be difficult, perhaps with pliers on the encoder coupling. A bent wire in the chuck to use as a pointer. And running the motor very slowly until that 20th is about to come up would greatly simplicate that. Then just subtract the first raw-count from the last.
Better yet would be a counter on the index and just let it run a while. Then the question is how can I do that. I'll figure out something. That is what gpio's are for... But first, transfer the wiring... > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
