Homing is only to set the machine soft limits not for material touch off...
On 4/12/2015 2:47 PM, Neil wrote: > 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 ------------------------------------------------------------------------------ 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
