Could you post your configs? Could your hal functions be out of order? I run pid steppers with RPI and don't notice this.
Sam On Wed, Feb 2, 2022, 3:01 AM andy pugh <bodge...@gmail.com> wrote: > On Wed, 2 Feb 2022 at 07:44, Thaddeus Waldner <thadw...@gmail.com> wrote: > > > 2) why is servo thread jitter even making into the stepper pulse train > with a Mesa Ethernet card and no communication errors? Do I have anything > misconfigured? > > The idea of using a PID is that it compensates for the fact that the > servo thread updates don't get to the card exactly every servo period. > Sometimes the feedback - calculate - send of the required step rate > will run early, sometimes late. > > I am hoping that PCW might pop up to explain exactly why the PID helps > here. It's not something I have paid that much attention to as I > rarely use steppers. > > It might be interesting to try a non-pid config. (or just set P to > zero which has about the same effect) > > -- > 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
