On Monday 25 May 2020 18:33:29 Jon Elson wrote: > On 05/25/2020 02:50 PM, N wrote: > > Do anyone here have any suggestion for FERROR and MIN_FERROR values? > > It depends on your "user units", as well as the general > accuracy and speed of the machine. > FERROR is a multiplier to velocity in user units/second that > is added to MIN_FERROR. > MIN_FERROR is the allowable following error with the machine > not moving. > > On a servo system, you should have Halscope graph the > following error and find out what > your actual errors are, and then set MIN_FERROR > accordingly. Then, set FERROR to > accommodate larger error at rapid traverse speed. > > There's no one good value for everybody. > > Jon
Perhaps this might be a good time to discuss/develop a recommended good practice procedure to be applied to a machine w/o PID's as there's none in the pi running the sheldon, and none in the D5215MW running the 6040. Can you recommend a procedure that Just Works, where the machine is expected to follow what the TP actually outputs, with a tolerance setting profile that its capable of staying inside of? Without PID's, where do we get a following error that we can see on the halscope? Or do I need to put PID's in before this makes sense? Or do I make a sub2 out of a sum2 just to develop the error signal? Eventually that would use up the cpu cycles saved by not using the PID's. And it all, to me, adds up to more give between the TP and what the machine does, allowing more error than w/o the PID. Seems to me there should be some "rules of thumb" to apply here. > > _______________________________________________ > 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
