On Monday 15 April 2013 15:09:03 jeremy youngs did opine: > yeah im kinda fond of the old man myself :)
Chuckle, next thing I know I'd better stock up on suds in case you all come to visit. ;-) > 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 Lؤپcis 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-linuxcn > > >>> c-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 Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> In the misfortune of our friends we find something that is not displeasing to us. -- La Rochefoucauld, "Maxims" A pen in the hand of this president is far more dangerous than a gun in the hands of 200 million law-abiding citizens. ------------------------------------------------------------------------------ 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
