On Oct 16, 2011, at 7:41 PM, Peter C. Wallace wrote: >>> >> Peter, >> >> Is there any reason not to open up the stepgen limits on accel and >> velocity so they cannot possibly be a limiting factor? Make them >> 1.0EE6 or so? >> >> Dave > > Yes, in some very specific situations, the current stepgen driver has > some pathologies when its has unlimited acceleration and velocity limits > I believe the problems are triggered by differences in the hardware clock and > the computers thread rate and also by large amounts of jitter on the servo > thread. These problems seem to go away when reasonable values of stepgen > maxaccel and maxvel are used (I think its most likely that maxaccell is the > sensitive parameter)
You are talking about: setp hm2_7i43.0.stepgen.01.maxaccel [AXIS_1]MAX_ACCELERATION setp hm2_7i43.0.stepgen.01.maxvel [AXIS_1]MAX_VELOCITY Yes? What do you consider reasonable? We currently have MAX_ACCELERATION = 120 but have tried values down to about 20-30. Tom ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
