A general rule of thumb is that the encoder should offer 10X the resolution of the minimum movement addressable by G code.
Following error can be as tight as 3 or 4 units of encoder resolution on a well tuned system. This of course does not take into account any mechanical deviation beyond where the encoder senses the motion. Doubling the encoder resolution would cut FE in half provided the rest of the system is up to it. Steve Stallings > -----Original Message----- > From: Neil Baylis [mailto:[email protected]] > Sent: Friday, May 07, 2010 11:41 AM > To: Enhanced Machine Controller (EMC) > Subject: [Emc-users] Encoder resolution & Following Error > > I hope this isn't a really stupid question, but what's the > relationship between encoder resolution and following error? > > For example, the machine I'm building currently has a linear > encoder of 250 cycles per inch, or 1000 counts. I assume this > won't allow me to achieve > 0.001 following error. And I understand FE is also affected > by machine rigidity, encoder noise, and other factors. > > Is there a formula that would tell me what FE would be > reasonably achievable with my machine? > > If I install an encoder with double the resolution, will that > cut my FE in half? > > Neil > -------------------------------------------------------------- > ---------------- > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
