Would be interresting to know what your mechanical and electrical setup is like.
leadscrew/reduction/motor/current/weight etc. Best Regards Kim Mortensen 2008/11/1 Jon Elson <[EMAIL PROTECTED]> > John Domville wrote: > > Lawrence G > > Ok, I finally got around to running the test you suggested. The > first > > couple moves (test #1) up and down > > Are ok, but after that the tip gets lower and lower into the piece. Also > > the motor makes a binding noise just > > Before it starts screwing up. Sounds like the motor is trying to move two > > opposite directions at the same time. > > Never did get to test two. So where do we go now? This by the way is > with > > a config file that uses + as a Z axis up > > And - as a Z axis down. Had a pencil stub loosely in the collet during > the > > test and it kept getting pushed further and further > > Into the collet until I forced a stop to the program before the face of > the > > collet went in to the bed surface. > > > Well, any time you are losing position with the Z axis dropping lower > and lower, you have to look at the capability of the motor to raise the > head. if you are overloading the motor due to the weight of the head, > then it will lose steps when moving up. I'm assuming this is a machine > with a milling head or router that is raised by the motor, not a machine > with a lightweight quill. > > First thing to try is to run the same program at lower speed (try 50% > feed override, then 25%, then 10%). If it works OK at lower speed, that > is an indication that your steppers can't deliver the torque needed for > upward movement PLUS acceleration at that velocity. (Steppers are > stronger, generally, at lower speeds.) You may have to lower the > maximum velocity setting in your .ini file to whatever the machine can > reliably do. > > If the head is very heavy, you may have to go with a stronger stepper > motor, or go to a 2:1 belt reduction ratio to get more torque at the > leadscrew. > > 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
