On Wed, 2010-11-24 at 12:41 -0800, Edward Bernard wrote: > So the flag could be a something like a single hall sensor and magnet as > opposed > to a quadrature encoder?
Yes, but I don't know how repeatable a Hall sensor is. My lathe uses a Hall sensor for the home switches, but it only needs to get within .1", then the encoder index takes over. A small magnet with a blade shape like a thin gear tooth might work well. You'll have to give it a try. You need to be able to home with a dial indicator attached and get the same reading several times. I suppose you could AND home and flag with hardware or with a HAL component to get axis.N.home-sw-in. encoder.N.phase-Z is also used with homing but isn't used unless you have the encoder component loaded. I haven't given this much thought. I'm not sure there would be any advantage to this unless you had encoders. A bit of trivia: http://en.wikipedia.org/wiki/Edwin_Hall -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
