even more so for me now :)
On Mon, Apr 15, 2013 at 2:48 PM, jeremy youngs <jcyoung...@gmail.com> wrote: > 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 > -- 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
