On 8/18/2016 9:14 AM, Todd Zuercher wrote: > I have a machine that I converted from step-motors to servos, and I'm having > a little trouble with the Z axis. It has an anti backlash lead screw with a > 5tpi screw. This sort of worked, but the servo was working hard to move the > head, and I wanted a little higher encoder resolution for better tuning. So I > swapped in a nearly identical 10tpi lead screw set I happened to have on hand > (removed from another stepper machine to get better speed and perfomance). I > thought that the 10tpi screw should be easier for the servo to turn, but I'm > finding that the opposite is true and the servo can't raise the motor without > counter balance assistance when it could with the 5tpi. Does that make sense, > or is the problem more likely that the 10tpi screw and nut are worn out and > binding? > Todd,
Are they both single start screws or is the 10 TPI a dual start screw? A 10 TPI dual start would be the same mechanical advantage as a 5TPI single start but would have the potential to have more binding/friction. If they are both single start then the 10TPI should be much easier on your motor. Jim ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
