On Monday 27 August 2018 15:17:39 Les Newell wrote: > Gene, you mentioned settable soft limits in your last post. I have > been doing some work along these lines. > > On my router the tool changer is on one end of the Y axis and a rogue > g-code file could ram the spindle into it and do a lot of damage. A > while back I messed up my tool change sequencing and it tried putting > a tool in a pocket that already had a tool in place. The machine > pushed the ATC out of the way with ease. The ATC is attached to the > gantry with a bracket made of 50x50 (2" square) steel box section, > which ended up badly twisted. It took the application of a lot of > effort with a big bar to straighten it all up again. > > Anyway to try to prevent rogue code doing damage I dynamically adjust > the Y axis limits. The limits can be changed with hal pins. For > example I adjust the hal pin ini.y.max_limit, increasing the positive > limit when I need to do a tool set or tool change. That way, in normal > operation it won't let the Y axis move far enough to hit the ATC. > > It should be possible to hook the limit pins to motion.analog-out-NN > pins. You can then use M67 to set the limits to whatever you want. The > only tricky bit is that the limits are in machine coordinates so you > have to do some clever trickery to convert work coords to machine > coords. On my lathe I'd like to override the tool change so it can > take the tool offsets into account when it sets the limit. > > Does anyone know a good way of converting work coords to machine > coords in g-code? > > Les > > Something I have wished for Les, on several occasions, but have not been able to find a way to do that math in hal. It could be there and I've thrown away enough calendars I don't recognize it when I see it. One of the hazards of outliving ones enemies.
-- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
