I have successfully upgraded an antique Bandit CNC on a Bridgeport to EMC2. I am using the Axis user interface.
Some of you may recall earlier postings of mine describing the difference between the x and y dro readout on my Bridgeport versus the emc2 readout that would occur when running the demo file, axis.ngc. The difference varied from +0.0800 to -0.1000 (usually much less than these extremes). I finally found out what was causing this error by writing a g code file that oscillated the axis under test between + 8 inches and - 8 inches at a feedrate of 5 ipm. I began at a feedrate of 100% and gradually decreased it until I discovered an instability between 1.6 ipm (20 stepper rpm) and 2.0 ipm (25 stepper rpm) due to stepper motor resonance. I wondered how the original system handled these resonances - maybe it was set up so that the firmware wouldn't let it operate at these speeds. I was able to cure this problem by fabricating dampers for the x and y axes. The z axis already had a damper on it from the original Bandit system. Even though no one suggested that my problem could be due to stepper motor resonance, I am ever grateful for the help that has been provided to get me going. I couldn't have done with out it. Thanks! Now all error has been eliminated and I now have a system ready to cut metal! Jack Ensor ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
