On Oct 20, 2008, at 7:45 AM, John Kasunich wrote: > Kenneth Lerman wrote: >> Hi Dave, >> >> I'm sure someone will correct me if I'm wrong; so here goes. >> >> The way index homing works is that after the homing switch >> actuation is >> detected, the next index pulse sets the home position. If, by bad >> luck, >> the edge of the index pulse is right at the switch edge, a little >> jitter >> might cause it to be missed. Then the next index pulse will be >> considered home. >> >> Let me guess. The distance between index pulses on your machine is >> .531-.505 = .026. So I would say the distance is 25 thousandths. >> >> The solution to your problem is to move your home switch by around 12 >> thousandths. >> >> Ken >> > > Actually I'm almost certain that the distance between index pulses is > more like 0.2" on Dave's machine. > > He said that index-enable went high, but didn't say anything about it > going low again. That sounds like it isn't getting the index pulse. > > I can't dig deeper at the moment, but if Dave could post the halscope > traces to imagebin or somewhere, it would help diagnose the issue. > > Regards, > > John Kasunich
Thanks John and Ken, Just as a refresher the pitch of the Mazak ball screw is 10 mm. The index phase, after switch is tripped is about 0.32", not perfect but certainly far enough. Indeed, I do not see the index-enable go low but that might be how my trace is set up. Will repeat the test and post to imagebin. Thanks for the prompt reply. Dave > > ---------------------------------------------------------------------- > --- > 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 > Emc-users@lists.sourceforge.net > 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
