Bruce Klawiter wrote: > I do not have a clue how to tune my servos. I have been reading everything I > can find on the subject but its like it is written in some alien language > that I'll never understand. > > What I have been doing so far is following this guide > http://www.newport.com/servicesupport/Tutorials/default.aspx?id=152. > Well, a VERY general description, nothing specific to EMC. > I can't get it any better than this, HELP I don't know what to do next > > Halscope images: https://sites.google.com/site/bmklawt/home/pid-tuning > Config files: https://sites.google.com/site/bmklawt/home/emc2 > > Some comments from somebody who has been trying to help Bruce. (I sold him a PPMC interface.) He is using low-resolution linear scales, 100 um resolution. He has set his user units to mm, and INPUT_SCALE to 100. I'm not sure if these scales can really be used for CNC motion feedback. The lowest-resolution scale I have ever used is about 10 times finer (20000 counts/inch). Clearly from his trace he needs more P, if the system can be stable with it. An error of .02mm may is probably the best that can be achieved with a .01mm encoder.
Bruce: I don't know how the system appears to be behaving, but your error of 20 - 30 um on the trace looks about as good as you'll get with those scales. That's within 2-3 encoder counts of commanded position. Jon ------------------------------------------------------------------------------ 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-d2dcopy1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
