On Friday 01 August 2014 02:32:27 Marcus Bowman did opine And Gene did reply: > 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
One thing I found odd and it may be a bug, was that if I did this from a G54 map G10 L20 p2 X#100 Y#101, then G55 was correctly set for Y offset G10 L20 P3 X#102 Y#101, that Y offset was 2x so I had to G10 L20 P3 X#102 Y0.00000 to get the same Y offset in both G55 and G56 maps. Common sense says I should have had to apply that discovered Y offset to both maps. Bug? Or Heisenbug? I did the top of a sample board this evening after sorting that basket of rattlesnakes, but when I flipped the board on it Y axis, and flipped the X -signs in the bot.etch.ngc to mirror it about the Y axis, I didn't apparently calculate #102 correctly. Its way off. About 1.25" I may have that sorted now but its the middle of the night. And I can't keep my pie intake hole shut. ;-) 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 ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck Code Sight - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
