On Monday 07 December 2020 12:18:52 Jon Elson wrote: > On 12/07/2020 05:19 AM, andy pugh wrote: > > On Mon, 7 Dec 2020 at 11:13, Gene Heskett <ghesk...@shentel.net> wrote: > >> Now comes the improvement request for two more pins into motion. > >> > >> I need a pin to disable the backlash move, until the spindle has > >> actually stopped. > > > > Are you sure that isn't what already happens? (I guess that Halscope > > can answer the question). > > I would expect the Z axis backlash reverse to happen when the Z axis > > actually changes direction, based on the encoder direction change. > > > > Have you considered a floating tap holder? You wouldn't need much > > float. > > Yes, as a matter of fact, Gene reports 2 mils of backlash > comp. I find it hard to believe THAT is the cause of sloppy > threads, especially on a small-light machine. I would think > it has enough flex that that would not cause the thread to > be harmed. I'm guessing there is more movement or a > following lag on the reversal that is causing the issue. > > Jon
Not 2 mills Jon, .002 thou. In fact I had zeroed it in prep for making a new measurement and had forgotten to reset it it, got sidetracked with this BS-1 thingy. Too many irons in the fire syndrome. > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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
