On Sunday 12 April 2015 15:47:13 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.
Neil, are you doing printed circuit boards? This does take a more precise Z drive than is the usual for affordable machines. Tight balls in fresh ball screws are a good starting point. I have some roputines on my web page at the link below that might be helpful, but they demand a Micarta pallet to hold the pcb material dead level & square to the table motion. You will likely have to setup a vacuum bedding to hold the PCB flat if over an inch in either direction as it does have a tendency to warp laying on the shelf. Look at tedautoz.ngc for one that can probe the pcb and establish a good zero, using the actual engraving bit as the probe. It leaves no mark on the copper. Then, because you need to register both sides of a thru hole PCB, there is tholefinder.ngc. I get repeat accuracy of about a thou with them. This one does have to be calibrated for each individual PCB pallet you fabricate though. The comments in the code should help you understand how they work, if not, yelp. [huge snip] 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
