On 11/3/2011 12:23 PM, Tom Easterday wrote: > On Nov 3, 2011, at 12:31 PM, andy pugh wrote: > > >> On 3 November 2011 16:14, Jon Elson<el...@pico-systems.com> wrote: >> >> >>> This allws the machine to home with a varying amount of racking of the >>> gantry >>> each time it is homed. This seems like a really poor choice. >>> >> Now you mention it...Yes. >> >> I was imagining that switches (or the dead-stop that Tom has been >> experimenting with) would do the squaring. Though then I don't know >> why you would bother with the index. >> > We have the squaring part working. We send a simultaneous signal to each > Granite drive and it homes to a hard stop and comes off a fixed amount. It > is repeatable to no worse than 0.002, often better (lte 0.001). > > Then we want to have EMC home just to the index on just one of the two joints > (don't really care which one) but it must also do it while coordinating the > opposite joint. > > The reason is that then that index location would have even better > repeatability. > > -Tom >
If I were you, I would accept the .002 repeatable homing result and consider that task completed. I don't think that finding an index mark will improve on what you have already done. Dave ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
