Stuart Stevenson wrote: > Gentlemen, > I have been thinking (I know - dangerous :) ). Is it possible the > SCR amp has backlash comp? It has a bunch of pots on it. > Extremely unlikely a VELOCITY servo amp could do this, as it has no position info. It seems they DID put such a scheme into the Bridgeport BOSS servos somehow, because they had pots for backlash setting. I would think it would be a messy compromise at best.
On the other hand, if I understood your earlier message that your screws have 4 thousandths of an inch of backlash, then no scheme will give very good results, that is a lot of backlash. I'd check for a number of causes of backlash, they could all be adding up to that much, and might all be correctable to some extent. If you try to correct backlash quickly, the motor accelerates until it bangs at the end of the backlash. The bigger the gap, the harder the bang. The unloaded motor can accelerate much more quickly than when loaded by the machine table. Jon ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
