On 31 Jul 2014, at 16:14, Gene Heskett wrote: > On Thursday 31 July 2014 08:22:34 John Thornton did opine > And Gene did reply: >> I think your focused on the word "calculated" and stop comprehending >> the rest of the sentence. So let me try and word what G10 L2 and G10 >> L20 do in a different way. >> >> G10 L2 P1 Z-1.5 sets the offset of G54 Z to -1.5, (which is #5223) >> >> G10 L20 P1 Z0 calculates the value needed to make the current location >> of G54 Z0 > > Now, if L20 p2 does that for G55, and L20 P3 does that for G56, its > exactly what I want. Because I want to replace, not modify, what is there > in the co-ordinate system p3 represents. So it seems I should be in G54 > mode when making my measurements intended to update the G55 and G56 co- > ordinates, right? >
Offsets are defined in relation to the absolute machine co-ordinates, but it is certainly useful to have a consistent reference to avoid brain-bending visualisation when other offsets are in play, so using G54 to set offsets is a good idea, I think. But G54 is defined by offsets from the absolute machine co-ordinates, just like the other G55-59 co-ordinate systems. I don't know where absolute co-ordinates live (and that's a conversation that has run here before, as I recall) but it doesn't matter because everything is relative in the G54-59 world. A bit like life... Marcus > But one last question, what co-ord system should I be in when I do it? > IOW, it won't be #5023, so perhaps I need to repeat, copying my code so it > only effects the top or bottom offsets? > >> Lets say I jog the Z axis to absolute machine coordinate -1.5 and my >> drill bit is just touching the top of the material. I want that point >> to be Z0. >> >> Now if I do G10 L2 P1 Z0 it sets the #5223 offset to 0, probably not >> what I wanted. The DRO reads Z-1.5000 because I stored an offset of 0 >> in #5223. >> >> Ok if I do G10 L20 P1 Z0 it calculates that it needs to set the offset >> to -1.5 so the G54 coordinate is equal to Z0.0000 and the DRO now reads >> 0.0000 for Z. >> >> To see what your current offset is just look on the DRO tab. >> >> If you break a drill bit you need to stop running code and start doing >> "chicken checks". If I'm not 100% sure I've got an offset correct I jog >> that axis to a position that I know what it should be and check the >> DRO. Using coordinate systems and offsets can be confusing so take >> your time and check, check, check. >> >> It does seem to me you should be setting the tool table not the >> coordinate system but I'm not fully sure of what your trying to do or >> what value is in #101. Perhaps a few lines of your G code might help... > > For z adjustments I thought so too, but I wasn't getting the results I > needed. Thinking back from my easy chair here, it may be that I wasn't > actually applying the offset? I'll check that as I originally was doing > that 18 months ago, with somewhat random results. But now my Z is quite a > bit more accurate, so I'll give that another shot too. > > That z code, yes, but the holefinder code which deals with X&Y locationsis > nearly 250 lines, many of them comments so I can decipher what I was doing > today, so I'll not blast the list with that. I will do that with the > autoz code if I can't make it work right this time. Currently its maybe > 75 LOC. But first, snug up my X gibs, & fix the pallet and add a lost > recovery stanza file before I even run tholefinder, which is designed to > run without any machine motion other than driving it roughly to the center > of the contact pipe in the pallet and executing the holfinder from there. > Since that diddles everything but z, only tracking it internally, I think > executing the "lost" procedure might be a good idea. > > All of this discussion has given me a better insight into what I am trying > to do. Obviously there is more than one way to skin this cat, the beauty > of LCNC. > > Thanks John. > >> JT >> >> On 7/31/2014 5:10 AM, Gene Heskett wrote: >>> If that is in fact what it does, replacing the current value there, >>> then its exactly what I want to do, eg replace any value currently >>> stored in G55 and G56's image of Z, as opposed to adding #101 to it. >>> Which is what the L2 version seems to be doing. And its costing me >>> money in the form of broken tooling at $10 to $20 a mill, and in >>> damaged pallets. >>> >>> If in fact replacement is what it does, and I will check that after I >>> have finished a nights sleep, what the heck does it mean by >>> "calculated" >> >> ----------------------------------------------------------------------- >> ------- Infragistics Professional >> Build stunning WinForms apps today! >> Reboot your WinForms applications with our WinForms controls. >> Build a bridge from your legacy apps to the future. >> http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.c >> lktrk _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > 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> > US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS > > ------------------------------------------------------------------------------ > Infragistics Professional > Build stunning WinForms apps today! > Reboot your WinForms applications with our WinForms controls. > Build a bridge from your legacy apps to the future. > http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? 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