On Monday 13 August 2018 10:39:03 Chris Radek wrote: > On Tue, Aug 07, 2018 at 08:17:03PM -0600, Brent Loschen wrote: > > And now for my question.?? The old Bridgeport had a button on the > > front panel titled "No Z" that turned off all z motion and let me > > "air mill" a part as a sanity check of my X & Y > > boundaries/fixtures.?? > > First congratulations on your first big retrofit. Now for the > opinions: > > As for the Z inhibit: are you using AXIS in LinuxCNC? The preview > shows where the tool is going to go, so there's little need for > running in the air. If you are concerned about getting close to a > fixture, you can jog the cone over onto the preview line (a jog > wheel is great for this) and then see where it will be when it runs. > > I think Z inhibit (and inhibit all) are on old controls because they > didn't have useful previews. You had no idea what the code was > going to do, or even if it would run or error or go crazy. My Boss8 > would just hang (it would stop and you had to push the control's > reset button on the back) for certain gcode errors, especially with > canned cycles. But with LinuxCNC when you load your gcode you see a > correct preview or an error message telling you what's wrong with it > and where. > > So I encourage you going to LinuxCNC with an open mind and not > trying to implement everything your old control had, whether it > makes sense or not.
Chris is 100% correct. I too tried to justify making LinuxCNC do a z suppression, and could not come up with a reason to do it that isn't satisfied for a dry run by simply doing a touch off to a point 2" lower than what the dro currently shows and when its obvious it clears all the fixture etc, take that offset back out by setting it that same 2" higher, putting it back to its homed co-ordinate. Sub a suitable distance for your machines configured measuring system, using 50mm for the machines setup in mm's. Make it nice and clean by adding an offset module to the Z chain, and toggle it in and out with a pyvcp button. Doing the z disable is making far more of a problem 5 minutes down the road when its re-enabled, and finds its not where it should be. One could, if insisting on the 1970 way of doing things, make a pyvcp button that toggled this offset in and out. Picky folks might even make two so the amount of lift could be adjusted in case of a short travel z quill. Or on a Bridgeport style machine, leave the quill alone, and lower the knee by an arbitrary amount, run it for observation, then put it back and hit r again. There are quite diverse methods/solutions according to the style of the machine, but a usable solution is no farther away for most once the machine and its .hal file is understood. > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
