2011/10/28 Tom Easterday <tom-...@bgp.nu>: > > This is for homing my gantry. It has two joints on one axis (the Y axis). > I want to have EMC ignore following error, and not control the motors while I > send a signal simultaneously to each of the two Granite Devices drive modules > which will then home both joints to a hard stop (and come off those hard > stops a small amount). The Granites ignore incoming signals while they are > doing this so I need EMC to be ok with the fact that it is not commanding the > motors and that there is huge following error. > > Once the Granite is done doing it's homing I want EMC to then search for > index on one of the two joints while moving the opposite joint in sync (so > the gantry doesn't rack) .
Ok, got it. If You do not want to disable Axis (which I do not see a reason for keeping it enabled, when servo drives are homing it), then I will agree with Andy's suggestion of using mux2 components. If I understand correctly, Your intended homing procedure is allowing servo drives move joints with considerably decreased torque in motors machine hits the end of travel. Is that correct? I am sure that even with greatly reduced torque in motors this is totally wrong approach, because You still are breaking Your machine. I still think that inductive proximity switch (or any other type of limit switch) for each joint is the way to go. > By the way, ultimately once we get things working, we will have a THC enabled > and I like your idea of the offset. Can you post (or pastebin) your config > for how you do the z+offset? Ok, let me know, when You will be working in that and I will post the files in my website. > I found a thread in the mailing list archives talking about options for > gantry homing that sounded like there was some work being done in that area. > Did anything come of that? Is there anything new on that front in 2.5? What is wrong with homing a gantry machine in released EMC2 versions? My waterjet machine is a gantry machine and it worked fine with gantrykins. I retrofitted a gantry-style plasma cutting machine in summer and it also is happy with gantrykins. Viesturs ------------------------------------------------------------------------------ The demand for IT networking professionals continues to grow, and the demand for specialized networking skills is growing even more rapidly. Take a complimentary Learning@Cisco Self-Assessment and learn about Cisco certifications, training, and career opportunities. http://p.sf.net/sfu/cisco-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
