When I installed the spindle encoder, I used a shaft at the top of the head. Due to my failure to investigate more fully, it turns out that it’s geared 1:1 with the spindle (but is not a part of the spindle). So when I go into backgear, the encoder reads opposite direction and at a different ratio equal to the backgear ratio (whatever that is, I’ve never bothered to determine it). Fine for running a face mill or fly cutter, but not usable for rigid tapping without some HAL to reverse direction and compensate for the ratio change when in backgear). Also, I’ve never gotten automatic spindle speed set up since I manually operate the vari-speed drive via push buttons on the head (HAL operates the air valves for me). I also have a +/-10V DAC board to control VFD frequency, but have never set that up either. I’m hoping to get rigid tapping working without solving some of these other issues, but if that’s the way it’s got to be, then so be it.
> On Jul 21, 2020, at 1:27 PM, andy pugh <bodge...@gmail.com> wrote: > > On Tue, 21 Jul 2020 at 18:16, Matthew Herd <herd.m...@gmail.com> wrote: > >> Thanks for the insights. I suspected something along these lines, even if I >> might have other problems with noise. I can confirm, the spindle stops way >> too slowly and definitely more than 10 revolutions pass before stopping. >> Long story short, I can’t readily run the machine in back gear > > I think that's a story cut too short. Why can't you run the machine in > back-gear? I really wouldn't anticipate rigid tapping being done > without it. > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > — George Fitch, Atlanta Constitution Newspaper, 1912 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
