What version of Linuxcnc (EMC2) were you running before the upgrade? I think there were some changes in how PIDs were handled between v2.5 and 2.7 that usually require a little servo returning.
----- Original Message ----- > From: "Les Newell" <les.new...@fastmail.co.uk> > To: emc-users@lists.sourceforge.net > Sent: Tuesday, June 27, 2017 10:01:34 AM > Subject: [Emc-users] Rough motion with servos > > I have been running my lathe using EMC for many years and decided to > upgrade to the latest LinuxCNC. The computer I am using is showing > it's > age and the ancient version of Debian I have been running won't even > boot properly on my new computer. > > The lathe has a 5i20 and a 7i29 to run the servos. Using the same PID > settings as I had in EMC I get odd random spikes in the Z axis motor > command signal, roughly about one to two a second. If I look at > pid.z.output with halscope I can see the spikes. This is on the same > computer and hardware as I was running EMC, which ran really > smoothly. I > changed the computer and the results are the same. I even used > Pncconf > to create an absolute minimum spec configuration and it does the same > thing. > > I tried both LinuxCNC 2.7.9 and Git head. Does anyone have any ideas > why > this would be happening? > > Les > > > ------------------------------------------------------------------------------ > 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
