Here are links to a halscope screen shot and log file for my servo machine that keeps setting following errors on first try homing.
homing-error.png: https://drive.google.com/open?id=0B6U6HVQUOa1fZndtbzVRU1dpOW8 halscope-homing.log: https://drive.google.com/open?id=0B6U6HVQUOa1fbmk5S1dKaFBoWWc ----- Original Message ----- From: "Nicklas Karlsson" <nicklas.karlsso...@gmail.com> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: Thursday, June 22, 2017 1:23:29 PM Subject: Re: [Emc-users] following error only while homing On Thu, 22 Jun 2017 00:06:42 +0100 andy pugh <bodge...@gmail.com> wrote: > On 21 June 2017 at 19:36, Peter C. Wallace <p...@mesanet.com> wrote: > > > The stepgen is not computing following error it just cant be driven by a > > position command with a stepwise discontinuity and move instantaneously to > > the new position. > > > I think it might be more interesting than that. Stepgen commanded position > and encoder position track each other very well, and the f-error is small > throughout. > > https://docs.google.com/spreadsheets/d/1qRVyQWFl4BIsSNKwy9IYsXrmZLTK8vgVVNX4tAuUmJM/edit?usp=sharing Yes there could be a following error for stepper generator. I think it is like this, it output step frequency and number of stepped steps backs so there could be a difference. I modified stepper driver for my own card and also discovered decimal point is useful then stepping with a frequency close to servo loop. Without decimal there will be quite a lot of jitter then switching between integer number of steps and decimal point place flanks withing period. It might be step speed have been chosen to avoid jitter. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
