I don't have a homing switch on Z (yet), and even if I did, I need Z to be set *very* accurately, so I think I'll need to manually set this still. I need to try this to see if HOME_OFFSET is taken into account without homing switches.
On 4/12/2015 2:39 PM, Gene Heskett wrote: > > On Sunday 12 April 2015 12:33:02 Neil wrote: >> The PnP software I'm playing with (openpnp) is hardcoded such that Z=0 >> to clear the PCB and components. I don't have much of an option at >> this point. >> >> Haven't heard of PyVCP but looking it up now. Seems like it will >> create it's own app (or panel). That might be a good thing actually, >> but for simplicity for now, is there a way to set the .ini file params >> so that it does this with the existing Home All button? >> >> Thanks. > A dim led just came on in my mind, and I believe the HOME_OFFSET setting > might be able to do that. Its intended to allow a precise home position > to be set relative to the switch closure it finds, allowing the switch > to be mounted at an arbitray position, and I believe you could use that > to establish the found position to be -20.00000000 that you quoted. I > am assuming its a metric machine since -20 inches is beyond the ability > of most machines under 5 tons weight to reach. There are not too many > machines extant that equal Stuart S's big Cincinatti. :-) > > Another thought crossed my mind too, the removes the need to electrically > isolate the workpiece so an electrical contact can be detected. Add the > thickness of a piece of PCB, copper coated one or both sides, and > connect the top surface to the z home switch input as assigned in the > breakout board. Clean well the bottom of the PCB, and the top of the > workpiece and place the PCB, active side up, on top of the workpiece. > With care about the cleanliness, that should repeatedly get you to > within a thou if the top of the workpiece is indeed flat and level to > the tables motions. > > I am not making new glasses for the Hubble telescope here, so that would > be "Good enough for the girls I go with", as one (now ex) bro-in-law was > famous for saying when it all worked. > >> On 4/12/2015 12:16 PM, John Thornton wrote: >>> Well normally the top of the material is Z0... and you use the touch >>> off button for that as it has nothing to do with homing. >>> >>> Yes, you can add a PyVCP button to issue a MDI command to set the Z >>> material height. >>> >>> JT >>> >>> On 4/12/2015 10:07 AM, Neil wrote: >>>> Another couple things I can't yet find... >>>> >>>> (1) How do I tell LinuxCNC that I am at a specific position. So I >>>> set Z to touch the top of a part and I want to tell it that's >>>> Z=-20. In Mach 3, I type the value in the DRO-displayed field. >>>> >>>> (2) Extra credit -- is there any way for me to set the Z-position >>>> to touch the top of a part (or table), then have one button set >>>> that to Z=-20, then it would automatically home X and Y? This >>>> would just make setup as simple as possible. >>>> >>>> Cheers, >>>> -Neil. >>>> >>>> >>>> ------------------------------------------------------------------- >>>> ----------- >>>> >>>> BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT >>>> Develop your own process in accordance with the BPMN 2 standard >>>> Learn Process modeling best practices with Bonita BPM through live >>>> exercises >>>> http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- >>>> event?utm_ >>>> source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA >>>> _SF _______________________________________________ >>>> Emc-users mailing list >>>> [email protected] >>>> https://lists.sourceforge.net/lists/listinfo/emc-users >> ---------------------------------------------------------------------- >> -------- BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT >> Develop your own process in accordance with the BPMN 2 standard >> Learn Process modeling best practices with Bonita BPM through live >> exercises >> http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- >> event?utm_ >> source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users > Cheers, Gene Heskett ------------------------------------------------------------------------------ BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT Develop your own process in accordance with the BPMN 2 standard Learn Process modeling best practices with Bonita BPM through live exercises http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
