Jon Elson <el...@...> writes: > > > What is your count resolution (in the ini file, that is INPUT_SCALE)? > Just guessing an encoder directly mounted on a 5 TPI leadscrew, that is > 5 * 2000 = 10,000 counts/inch or 0.0001" per count. That is definitely > on the low side. I am using 20,000 counts/inch on the X and Y of my > Bridgeport, and it works, but doesn't give the tightest control. But, > these were the encoders I could afford at the time (1000 cycle/rev, 4000 > counts/rev). > > If you are not using FF1 and FF2, you should really explore them, they > can help IMMENSELY. If you are, then increased encoder resolution > should help. I know that I can tune my minimill, with the 128,000 > counts/inch, to insanely small following error. Far less than the real > errors (backlash, screw pitch errors, etc.) > > Jon
Hi Jon, You guessed right, my INPUT_SCALE value is 10160 since my screws are metric. Yes, I use both FF1 & FF2. I am already looking into retrofitting the highest resolution encoders I can afford. I think you are right about needing all the counts you can get for good accuracy. My ballscrews all have less than .001" backlash. Thanks! Tom ------------------------------------------------------------------------------ This SF.net email is sponsored by: High Quality Requirements in a Collaborative Environment. Download a free trial of Rational Requirements Composer Now! http://p.sf.net/sfu/www-ibm-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
