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 -- "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> ------------------------------------------------------------------------------ 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
