On Thu, 7 May 2009, Frank Tkalcevic wrote: > Date: Thu, 7 May 2009 08:07:03 +0000 (UTC) > From: Frank Tkalcevic <fr...@franksworkshop.com.au> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Emc-users Digest, Vol 37, Issue 15 > >> did you test limit2 and limit3, or just limit3? I'm not sure whether >> second-derivative limiting (since command is speed, I guess that makes >> it a jerk limit) is useful for spindle speed, and it would be nice to >> hear real-world results. > > Just limit3. I used the basic motion equations s=vt and v=at to estimate > maxs, maxv and maxa to accelerate the spindle from 0 to 1500 in 3 seconds. It > worked nicely. > > After configuring and being happy with the results, it suddenly stopped > working and I spent the rest of the day trying to repair it. My problem was > at low speeds, with the encoder.velocity being all over the place. I used > lowpass, and got good enough results. Is there a component that will smooth > out a curve? A moving average?
Are you using HostMot2? HostMot2 has a much better velocity output than the old M5I20 driver/firmware. Peter Wallace Mesa Electronics ------------------------------------------------------------------------------ The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your production scanning environment may not be a perfect world - but thanks to Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700 Series Scanner you'll get full speed at 300 dpi even with all image processing features enabled. http://p.sf.net/sfu/kodak-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
