On Monday 15 April 2013 14:55:39 sam sokolik did opine: > Thanks :) > > love you > sam
Thanks Sam, I like the flowers but what brought that on? There are probably 200+ people here who _could_ write a similar tome that described their particular hardware (miss-)configurations. :) OTOH, I am well aware that turning swarf into money comes first, and many might not feel like they have the time. Generally, I do as long as the grass doesn't need cut yadda yadda. That is, after all, what this list is about, helping folks understand and use linuxcnc. This list, and IRC too, has helped me a lot, and where I can, since I'm retired with no real schedule to meet, I try to pay it back. So I thank you all for the help I have been given by folks who stopped what they were doing just to help me. Sometimes in the heat of solving a problem I forget to say that, but the help is most certainly appreciated. > > 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-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 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> "The Street finds its own uses for technology." -- William Gibson 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
