I'm not familiar with the Pico interface. Basee upon the docs it looks to be a velocity mode stepgen.
I have a mesa velocity mode Stephen to servo system on my router. This site was helpful to me getting this set up. https://gnipsel.com/linuxcnc/tuning/servo.html. If I recall I had to tune the servos drives themselves and the velocity control pid loops "simultaneously". Which in reality went somethijg like this. 1. in servo drive use autotuning. this gets reasonable decent tuning in the drive. 2. get the linuxcnc velocity pid tuning to the point where I could get homing working properly. 3. make your Ferror values temporarily large. 3. follow the advice from the link above open up haltune and tune your velocity loops. keep tuning as long as the results keep improving. (not looking for perfect just improvement) 4. go back into your servo drives. modify the parameters for them...again looking for improvements. halscope is your friend here too. halscope is tough to learn how to use at first but important. 5. go back to step 3. repeat step 3 and 4 until things tighten up to your liking. 6. readjust your homing setup and limits... 7. profit? :-) -Curt On Wed, Jun 30, 2021, 9:45 PM Gene Heskett <ghesk...@shentel.net> wrote: > On Wednesday 30 June 2021 14:47:57 Les Newell wrote: > > > On 30/06/2021 12:52, Gene Heskett wrote: > > > This is good to know Les, thank you. But for those who don't know > > > how to achieve that, a 1 axis example would be a huge help. > > > > In your INI file, there are two places where you can set the MIN_LIMIT > > and MAX_LIMIT (joint and axis). Just make sure you hit the axis limit > > before the joint limit. The difference does not need to be much.* > > * > Re-reading that, linuxcnc will not even start if they don't match > exactly. Unless that has been fixed in the month since I last played > with it. I will dbl check that tomorrow but not tonight, its pretty > noisy out at 21:30 here in north central WV. I've already had one > failure of an hour and 45 minutes and it hasn't done me a lot of good to > have the bios restart, due to my standby's start time of just over 5 > seconds, thats not enough time to do a cold reboot so it crashes until I > go out and do a full powerdown from each machines switch. And thats the > condition of the three dell 7010's at the moment. :( > > Thanks Les. To becontinued... > > > > > In making a servo for axis A/B/C in a stepper machine, there is a > > > huge differential in how it runs unhomed, and how it runs after > > > homed. Being a full rotation device, it has no limits set. > > > > In that case you won't be using soft limits, so it makes no > > difference. > > > > Les > > > > > > _______________________________________________ > > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users