On Oct 25, 2008, at 9:24 PM, Jon Elson wrote: > >> On Sat, Oct 25, 2008 at 09:20:38AM -0700, Dave Engvall wrote: >> >>> I'm not at all certain that rehome works ( homing a second or more >>> time after bring up emc). I ended up 0.1" off one time. >>> > If it was EXACTLY 0.1000" off, then it sounds like homing to the wrong > turn of the screw somehow. > If your screw is .2" pitch, then maybe there are two index pulses / > rev? Or is this a linear encoder? pitch is 1 cm and the 0.1 inch was an eyeball
I did ten homes in a row where I shutdown emc; then started and homed. All we as dead on as I could determine. i.e. center of a 0.500 end mill in a 0.500 drill bushing. If I really wanted to fuss with it I would set up a pair of +- 0.015 dial indicators. I did do several with the dial indicator in the spindle and looking at the bore of the drill bushing. They were well within the backlash of my machine. As long as I leave the drill bushing in place I can easily check on a homing sequence. Dave > > If it was just off by ~ .1" with no accuracy to it, then it is some > other problem. EMC2 shouldn't particularly care whether the > machine is > homed for the first time since starting EMC, or rehoming. It should > behave the same way, and be as reliable (or un-reliable) first time or > on a rehome. > If it really DOES make a difference, that starts to sound like a > problem > in the HAL driver. Without enough tests, you might be throwing in > a red > herring on the first time vs. rehome thing. > > Jon > > ---------------------------------------------------------------------- > --- > This SF.Net email is sponsored by the Moblin Your Move Developer's > challenge > Build the coolest Linux based applications with Moblin SDK & win > great prizes > Grand prize is a trip for two to an Open Source event anywhere in > the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
