On Saturday 31 October 2020 15:20:29 marcus.bow...@visible.eclipse.co.uk wrote:
> Gene, > > I am probably barking up the wrong tree, but: > > As a general method, I would position the controlled point where I > wanted the routine to begin. > (Say at X40 Y25 Z10) > Then I would call the subroutine. > Inside the subroutine, I would use G92 to set the current position to > zero (or some other useful value - but usually zero). > So that would mean putting > G92 X0 Y0 Z0 > at the start. And that would create an offset for the whole > co-ordinate system, so that the controlled point is now considered to > be at X0 Y0 Z0 (or whatever you specified when you used the G92 > command). > Then there would be the various commands to get the job done. > The subroutine would end with > G92.1 > to remove the overall offset and return the co-ordinate system to its > original values before I called the subroutine. > > I don't see G92 or G92.1 anywhere in your code. > I do see G91, but I am not sure why - not that it matters, provided it > is not trying to do the job of G92. > > I may be well of beam with this, and may have misunderstood the > problem, in which case I apologize. > No, I think you have the picture nice and sharp. But with those changes, I am still looking at the same 50% arc error. But, I am looking at the exact same error straight out of conterbore.py!!! Nothing added. Nothing removed. This it is, straight out of counterbore.py ============================= (SHCS Counterbore, Diameter = 0.3600, Depth = 0.2000 ) (Number of Cuts 14, Depth of Cut 0.0143) (Tool Diameter = 0.2500) (Spiral Down to Depth of each Pass and Spiral Out) F10.0 S750 (Hole Center X0.0000 Y0.0000) G0 Z4.2500 G0 X0.0000 Y-0.0550 G1 Z0.0100 (spiral down) G3 X0.0000 Y-0.0550 Z-0.0143 J0.0550 G3 X0.0000 Y-0.0550 Z-0.0286 J0.0550 G3 X0.0000 Y-0.0550 Z-0.0429 J0.0550 G3 X0.0000 Y-0.0550 Z-0.0571 J0.0550 G3 X0.0000 Y-0.0550 Z-0.0714 J0.0550 G3 X0.0000 Y-0.0550 Z-0.0857 J0.0550 G3 X0.0000 Y-0.0550 Z-0.1000 J0.0550 G3 X0.0000 Y-0.0550 Z-0.1143 J0.0550 G3 X0.0000 Y-0.0550 Z-0.1286 J0.0550 G3 X0.0000 Y-0.0550 Z-0.1429 J0.0550 G3 X0.0000 Y-0.0550 Z-0.1571 J0.0550 G3 X0.0000 Y-0.0550 Z-0.1714 J0.0550 G3 X0.0000 Y-0.0550 Z-0.1857 J0.0550 G3 X0.0000 Y-0.0550 Z-0.2000 J0.0550 (clean up hole) G3 X0.0000 Y-0.0550 J0.0550 G1 X0.0000 Y0.0000 ====================================== > Regards, > > Marcus > Thank you Marcus, that sounds like it would work. But Z remains absolute in this instance so I am assuming a G92 x0.0000 y0.0000 would do what I want. I'm obviously still learning some of the finer points about gcode. Only been hacking on it for 16 years or so. :) But g2/3 has been my nemisis since the first BDI install. 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
