On Wed, 2007-10-10 at 22:51 -0400, Stephen Wille Padnos wrote: > Kirk Wallace wrote: > > >[snip] > >--- hnc-3a.ini --- > >... snip > >FERROR = 0.0005 > >MIN_FERROR = 0.010 > >... snip > >--- > > > > > Note that this gives you a FERROR of 0.010 at all speeds. > > You'd want to swap those two values if the intent was to have small > allowable error at low speeds and higher allowable error at high speeds. > > That calculation is done by setting the allowable error at top speed to > FERROR. At lower speeds, allowable error is proportional to current > speed / top speed (so at 50% speed, the allowable error is 50% of > FERROR). This is clipped at the low end to MIN_FERROR. This is so very > slow motion doesn't end up with zero (or <1 encoder count) allowable > error due to roundoff. > > - Steve
It makes sense that MIN_FERROR could be much smaller than FERROR, but after making other adjustments and cut and try, I worked these numbers down to FERROR = 0.0002 and MIN_FERROR = 0.0025. It may be an indication that there are issues that I have yet to discover. -- Kirk Wallace (Hardinge HNC lathe, California, USA http://www.wallacecompany.com/machine_shop/ ) ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
