yeah im kinda fond of the old man myself :)
On Mon, Apr 15, 2013 at 2:42 PM, sam sokolik <sa...@empirescreen.com> wrote: > Thanks :) > > love you > sam > On 4/15/2013 1:28 PM, Gene Heskett wrote: > > On Monday 15 April 2013 13:22:31 Viesturs Lācis did opine: > > > >> 2013/4/15 andy pugh <bodge...@gmail.com> > >> > >>> On 15 April 2013 11:00, Gregg Eshelman <g_ala...@yahoo.com> wrote: > >>>> The crossover counters any offset push at one end of the gantry with > >>>> an > >>> equal pull in the same direction at the opposite end. The theory page > >>> shows how it works. > >>> > >>> I have stared at the diagrams for long enough now that I have changed > >>> my mind several times. I might have to build one to see. > >>> > >>>> Does LinuxCNC have H-bot support? CoreXY should drive identically. > >>> Not built-in, but: > >>> > >>> http://www.linuxcnc.org/index.php/english/forum/38-general-linuxcnc-qu > >>> estions/26302-cnc-avec-systeme-h-bot-ou-corexy > >> Hmm, it is not the first time I see links to that Russian forum and with > >> every time I get stronger and stronger impression that those LinuxCNC > >> users that hang out there is a completely separate community... > >> > >> Anyway, I just cannot figure out, how to set up homing routine to home > >> such a machine to some switches. > > Use the sign of the HOME_SEARCH_VELOCITY to control which switch its > > looking for. Then HOME_OFFSET with a sign can set home to any position. > > Then in case the home switches are off in a corner someplace and you have > > to jog the machine to a suitable starting position before invoking the > > homing operation, run it to where the first switch is available quickly, > > and use the HOME_SEQUENCE number to put all the home ops in the proper > > order. > > > > On my lathe, a grep of the .ini for HOME returns this: > > In [TRAJ] > > HOME_ALL = 1 (one home all button in axis) > > > > In x [AXIS_0] > > HOME = 1.250 (where it parks it when done) > > HOME_IGNORE_LIMITS = YES > > HOME_USE_INDEX = NO (if servo's, could be useful) > > HOME_OFFSET = 0.01000000 (where it marks it as 0.0 from where its at) > > HOME_SEARCH_VEL = -0.08 (in machine units, IPS IOW) > > HOME_LATCH_VEL = -.008 > > HOME_FINAL_VEL = -.1 > > HOME_IS_SHARED = 1 (one logic signal is input for all homes) > > HOME_SEQUENCE = 1 (second one to be done) > > > > > > In z [AXIS_2] > > HOME = 4.250 (where it marks it as being when finished) > > HOME_IGNORE_LIMITS = YES > > HOME_USE_INDEX = NO > > HOME_OFFSET = 4.090 ( distance in this case from left face of gauge to > face > > of pcb on right face of gauge) > > HOME_SEARCH_VEL = -0.08 > > HOME_LATCH_VEL = -0.015 > > HOME_FINAL_VEL = 0.25 > > HOME_IS_SHARED = 1 > > HOME_SEQUENCE = 0 (first to home) > > > > I place a gauge I made on the ways, backed up against the work piece as > > chucked, place a cleaned cutting tool next to the pcb copper that is the > Z > > detector on the gauge, and hit the HOME_ALL button, It searches z for > > contact, sets the home offset such that 0.0z is shaving the rust off the > > chuck jaws, or if work is chucked, touching the face of the work. Then > it > > backs away a wee bit and searches inward to find the contact for the x > > home, finds that piece of pcb, sets home to pretty close to the center of > > the work (I'm still fine tuning that) then parks the tool back out of the > > way till its needed. > > > > yerp, buzz, yerp, yerp, buzz, yerp, done in about 7 seconds. > > > > If the ways and base of my tool are lox clean, repeatable to under .001". > > That however is a major problem for x as it tilts the gauge just for a > good > > coat of vactra on the ways. I need to make the rear, huge flat area > into a > > single point contact with the back in order to penetrate the oil film and > > possibly leave a little room for dust, between it and the flat back way > on > > that toy lathe. > > > > The man page on homing could be clearer, but careful rereads will point > the > > way as there are many, many variations. And there are N! ways to screw > it > > up. :) > > > > The only fly in this ointment is that it all goes totally, absolutely to > > hell if you have applied /any/ touch offs, and in my case I would call > not > > canceling the touch off in effect as the first thing the homing operation > > does a bug. Ditto for trying to use position.txt, as that also > > contaminates the zero's this sets. > > > > IMO its a BUG, and for me a BIG BUG, requiring that I first stop > linuxcnc, > > nuke the position.txt AND the linuxcnc.vars files before restarting > > linuxcnc, so that it truly starts from scratch when homing. > > > > Touching the HOME button should first NUKE any touch off offsets in > effect > > at the time for the axis being homed. > > > > It does not, so home is then relative to the &^$#@ offset. I have broken > > tools and wrecked nearly finished parts because of this, several times. > > > > Is there a valid reason for the current, save the offsets behavior? > > > > Cheers, Gene > > > > ------------------------------------------------------------------------------ > Precog is a next-generation analytics platform capable of advanced > analytics on semi-structured data. The platform includes APIs for building > apps and a phenomenal toolset for data science. Developers can use > our toolset for easy data analysis & visualization. Get a free account! > http://www2.precog.com/precogplatform/slashdotnewsletter > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- jeremy youngs ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
