On Wednesday 06 April 2016 05:50:30 andy pugh wrote: > On 6 April 2016 at 09:53, Marshland Engineering > > <marshl...@marshland.co.nz> wrote: > > The only way I can get any control over the travel is setting P = > > 0.5 which of course makes the position accuracy poor. > > I am not sure that that necessarily follows. The P term is correct > when it is correct, there isn't a target value. > You should be able to correct steady-state errors by adding I. You may > be able to damp the oscillations with a little bit of D (expect D to > be a tiny fraction of P)
Is this a point where it might be recommended to use the "at-pid" module, read the manpage carefully, and see what sort of results can be obtained? I have not tried this myself, but have the manpage preprinted for the next time I go play with the newer mill. I think it would be a Good Thing(TM) if we can build up a database of sorts showing that it can do automatically, at least as good as we can do manually, at a considerable time savings in arriving at a well working setup overall. But in the 9 years since its advent, I can only recall a very few comments about it, how well it works etc, so obviously it is not being at all widely used. N.I.H. syndrome perhaps? With man page in hand, I intend to see how well I can make it work, and if it gives better results than my own cuss & cry efforts have managed. But ATM, I am rummaging thru the midden heap in here, trying to find what I need to get my taxes filed by the 15th. And generating 13 gallon trash bags full of shredded paper that should have been shredded 4 years or more ago. Packratitis is incurable, darn it. 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) 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
