Greetings all; Without my modifying the code, lcnc has suddenly decided to run short, as if the x scale is about 5% low. Checking backlash shows the screw couplings appear to be tight.
I've setup a 12" digital caliper, and have adjusted the scale until the tool, moved 10.000000" according to the dro, shows that it has actually moved within .002" of 10". But repeated measurements require I add about 2 counts to the scale value for every repeated measurement done that way, and I've added around 20 counts trying to catch up. In a 16750 count, 20 is not that much. This panel I want to carve measures 11.189" long according to this 12 " digital caliper, but if I home it with the right side of the tool just touching the left end, then run it in one motion to [11.189 + tool dia of 4mm], it stops about 3/8" short of placeing the left side of the tool against the right edge of the panel. A .002 error in 10" measured vs that nominally 3/8" error in 11.346480315" makes no sense. Putting an air run to that point in the code does not expand the extents displayed in the backplot, so the scale error in my hole positions isn't obvious. How do I fix that for starters? Humm, IIRC G0's don't count. but G1's do. Fix the code. Put a G0z#<_ZUP>, which will still clear the panel, then a 50 thou long g1 y move. That ought to register. What to check next? FWIW, with my motor drivers, taken from the old HF mill, I have it doing rapids at 180 ipm with no sign of a stall yet. This machines G0 speed is surprising me. It was doing 120 ipm, over 10x what the hf could do, but still with the parport drive, now with a 5i25 and 7i76 combo. All sorts of i/o left over for toys. Thanks everybody. 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> _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
