On Sunday 10 August 2014 13:10:15 Peter C. Wallace did opine And Gene did reply: > On Sun, 10 Aug 2014, John Alexander Stewart wrote: > > Date: Sun, 10 Aug 2014 12:52:19 -0400 > > From: John Alexander Stewart <[email protected]> > > Reply-To: "Enhanced Machine Controller (EMC)" > > > > <[email protected]> > > > > To: "Enhanced Machine Controller (EMC)" > > <[email protected]> Subject: [Emc-users] G540, 5i25, > > missing steps, once again. > > > > Hi all; > > > > I thought I had this fixed. > > > > running a 4 hour engraving process, and the X axis slowly moves. At > > the end, it is off, maybe, 0.3mm or so. (using centre drill before > > and after, you can see different points) > > > > I thought I had this fixed, because I've had this problem for a long > > time, now I find that the error is small, but still exists. > > > > - 5i25 has stepdir, etc, parameters set to 2,000 (all 4 of them) > > You might try setting the steptime a little longer, I have seen other > cases where more margin is needed, unless your maximum steprate is > getting close to 1/(steplength+stepspace), there is no disadvantage to > using longer times and they improve your overall margins
I will concur with Peter, but would also lengthen the dirsetup and dirhold times by another 1000ns, or one microsecond of additional time for all 4 of those signal specs. There is a page in the wiki that lists the required times for a quite long list of drivers, and I have had zero problems since adding 1 microsecond to all 4 timing specs listed for my 2M542 drivers. > > - The G540 motor is tuned as per directions. (tuned more than once) > > > > - Only X axis affected, and only in 1 direction. > > > > - machine slowed down, currently trying one where I increased accel > > parameters to slow down any "jerking". > > > > I'm beginning to think that the G540 is not working quite right, as > > I've spent (probably, over the last year) about 1 week on fixing > > this X axis slip. > > > > What would you guys try? 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> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
