[EMAIL PROTECTED] wrote: > hi > you said that "Clearly higher feed-rates are more difficult for the PID > loop. " > what about tunup problem with very slow motion? i mean feed with 0.0001 > per minute. i use ball screw 5 mm per revolution
I can test low feed rates when I have time. Probably need to sample at a lower sample-rate so that the move fits into hal-scope. Astronomers make telescope mounts that turn 1rev/24h = 0.0007 RPM all the time. They use worm-drives (maybe 1:100 or 1:200) and usually gearing after that too. Periodic error in the worm is a problem so the hi-tech solution uses two telescopes, one that locks onto a guide-star and provides correcting feedback to the mount, and one main telescope for observing/photography. Anders ------------------------------------------------------------------------- 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
