On Monday 03 September 2018 10:20:09 Les Newell wrote: > I would first stick a hal meter on bwX0 to see what lincurve is > actually doing.
At the moment, zip. > Using offsets like this can be troublesome. I did something similar on > my lathe for a while and always had homing issues. The problem is that > your Z position suddenly changes when it finds the home switch so the > offset on X suddenly changes, causing a following error. That agrees with my diagnosis. But it will rule out useing the offset in X to tell it the switch is 5" or more from the centerline, so touch offs WILL be required before the dro is within an inch of the real diameter. But by using a limit3 to limit the correction speed, I might be able to get away with it. Humm, sounds like a limit3 set gawdawful slow, between lincurve.out and offset.in might be usefull. At the normal speed of Z, the correction is likely less than a thou per second. So X ought to be able to keep up. Something in the range of 3 or 4 thou is all the correction it would need according to the measurements I've made so far. LCNC can also use a file, but only in the same axis to comp for screw thread errors, so its helpless in this case. Bed wear is an X correction based on Z measurement. Does not correct for tool height of coarse, only for the tilt inward and outward created by uneven bed wear of the front and rear bed rails. > This movement > also does not obey any maximum acceleration limits. The moveoff > component tries to work around some of these issues as it obeys > acceleration and speed limits but you may still have homing issues. So I'll try the limit3 just to keep the corrections within the X motion envelope. But it will be a day, maybe 2 before I get back to this if WHAW won't come up at sunrise tomorrow, and then I put two cans of R-134A in my pickups AC this morning, which may have been half a can too much, so I'm going to let the pro's check it out. At one can it was making cooler air, but still in the 80's, nowhere the 50's I expected. Gages said I had room for some more, but that killed any cooling as its now cycling the compressor. Some mornings its just not worth it to gnaw thru the straps and get up to pee... Too many years (83) on this carcass. Thanks Les. -- 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
