On Friday 18 December 2020 05:23:45 andy pugh wrote: > On Fri, 18 Dec 2020 at 08:16, Gene Heskett <ghesk...@shentel.net> wrote: > > > Also for a rotary table I wonder if you could use a push button on > > > a control pannel. You define home to be whatever you want. For > > > example if you need to make 20 cuts to cut a gear, do you care > > > where the firth tooth is on the black? > > > > Generally no, Chris, but there will be times, like when a gear > > already has the keyway cut. :) > > I have not bothered with home switches on my rotary, it just homes > where it is. (zero search velocity) as part of the home sequence. > > If there is already a keyway or feature on the shaft then I am not > sure that homing really helps, unless it is a job that was left in > overnight. > (And in that case I would return to zero before shutting it down). > > Aligning to an existing keyway or flat is a touch-off process, not > homing.
That was my impression too, Andy, but I can drive it till the encoders rawcount is maybe a dozen counts from zero, touch it off to zero, and restart LinuxCNC and its back to -44 thousand counts on the restart. So call me puzzled. Even nuking position.txt doesn't prevent it long term. I parked it on the switch but didn't touch off to 0.000 before the last shutdown and this is position.txt now: 0.00010004874109802 0.00000004978340956 6.24999990801172967 -33.10949999999843385 0.00000000000000000 0.00000000000000000 0.00000000000000000 0.00000000000000000 0.00000000000000000 0.00000000000000000 0.00000000000000000 0.00000000000000000 0.00000000000000000 0.00000000000000000 0.00000000000000000 0.00000000000000000 Thanks Andy 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
