On Sunday 23 December 2018 14:41:49 Marcus Bowman wrote: > I' m not entirely sure I have the correct picture of what you are > trying to do, but I have cut lots of panels covered in holes for > D-subs and audio connectors (for sound studios) and a series of mould > plates for plastic moulding which consist of rows of identical > recesses. G92.1 cancels all G92 offsets, so that always goes in the > initialisation block in all my programs. If I am cutting rows of > holes, with simple or complex outlines, I always go the the hole > position, then use a subroutine to cut the hole. The subroutine always > begins with G92 and always ends with G92.1 That is, I think, a > slightly different application from your own, but the documentation > here > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?CoordinateSystems#G52_coordin >ate_offset_not_yet_implemented states that G52 is not yet implemented.
The docs for master say it is now builtin. But it looks to be to be much more complete in the form of the G92 stuffs. Which is probably what I'll use. > I've used it in Mach3, and it works fine there, so its a pity it is > not yet available in LinuxCNC (if the documentation is correct). > However; you could reset HOME for, say, G54, by writing to systems > parameters 5221-5230, to give the same effect. I would be inclined to > read 5221-5230 into other parameters; then change their values to a > new HOME position, then restore the original values from your own > parameters. I've done that too, read em out and saved, diddled them, then restored them from my local vars on exiting the SUB. IIRC it worked well, but I don't recall what I was doing at the time. At least 3 maybe 4 calendars tossed since then. Probably while I was "printing" some eagle output for TLM's encoder. Double sided side registration, worked well but was a pita to make it work, I was drilling about 55% of the boards thickness and making the holes meet in the middle of the board thickness without detectable errors. Now that I have metal gears in that head, I should make a new encoder out of ATS-667's. They worked like a dream for the Sheldon although I had to make the holder 3 times to get decent quadrature. Those teeth may be to close together for the ATS-667's though. > But perhaps I am simplifying (or complicating) something which is more > complex than I have understood. > > Marcus > > On 23 Dec 2018, at 11:11, Gene Heskett wrote: > > Greetings all; > > > > It will still be a while before I'm ready to cut this panel on the > > new machine. > > > > Can't sleep, and had the idea to use the existing holes to > > automaticly establish both home, and the panels length. > > > > I've measured the panels width, and established a center line for Y > > at half that. > > > > The mounting holes are plus or minus 0.65625 from this center line > > Y. So if I have to adjust the panel width, the other points follow > > as they are .0.60000000 from the bottom or top. Whats more of a SWAG > > is the mounting hole offset from the ends of the panel, which ATM > > I've measured at .3125" in from the ends > > > > These mounting holes are also nominally a 4mm hole at the bottom of > > the counter sink. In terms of a thru hole. > > > > So it occurres to me to skip cutting the outline once a good fit has > > been achieved. > > > > Then I want to use a variation of my hole_finder routine to "find" > > the lower left of one of these holes. Once that has been done, goto > > the matching hole on the other end of the panel and "find" that > > hole, and use that offset to reset #<_panel_len> a few thou, which I > > can then use to reset the center line. All the rest of the hole > > locations except the dsubs will follow along, thereby maintaining > > the precisely laid out appearance of all the round hole spacings. > > All this so the last two copies I cut can be done on the satin > > brushed finished OEM panel from the box kit. Purtier that way than > > on the side panel of a wrecked ups van complete with a decades worth > > of road salt etc on it. > > > > Is this a place for the G52, to effectively rehome all maps after > > the first hole is found. I see G92 can do the same thing but I'm not > > sure I want it more or less permanent. I think it would be a safer > > assumption if it died with the M2. However I see that G52 is current > > co-ordinate, while G92 is all maps, which is what I want. Sooo, > > looks like its G92, with cancelation stuff in the file preamble. > > > > Are there any gotchas to the idea that I should be aware of? > > I've already put the disable_g92_persistence in the [rs274] section. > > > > Thanks guys, have a joyous Christmas. > > > > 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-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > 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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
