On Fri, 2008-04-18 at 22:15 -0700, Dave Engvall wrote: > On Apr 18, 2008, at 9:09 PM, Kirk Wallace wrote: ... snip > > becomes too large -- this will allow the system to avoid hunting or > > oscillating, a common servo problem." > > Sorry, Kirk but well tuned servo systems don't oscillate or hunt.
Those were Wikipedias words, not mine. ... snip > > But, I don't think you can tune a real servo system down to the > > last few > > encoder counts, or am I wrong? > > I think you will find servo systems reporting following errors at low > speeds in the 1E-4 to 1E-5 range > and 0.0005 to 0.001 at rapids. > > Dave My HNC has .00004" per encoder pulse. I need to do the math but typically with my tuning, I am guessing I get within 10 pulses. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC/EMC CNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending Craftsman AA 109 restoration Shizuoka ST-N/EMC CNC) ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
