Could this be a worn thrust bearing instead? I had a similar behavior a few years ago and that was the cause.
Leonardo Marsaglia El lun., 12 abr. 2021 15:25, Todd Zuercher <to...@pgrahamdunn.com> escribió: > Those here who have had to deal with a worn out ball screw. How is this > normally manifested. I have a machine that is only showing backlash under > load. Is that normally how a worn out screw shows it's age? I was > expecting it to be normal loose backlash that you can measure. But this is > showing up as springy softness that you have to give a pretty hard shove > against to move the dial indicator, then it snaps back to zero when you let > go. Using the usual jogging methods to read backlash, the machine reads > zero backlash and positions well. But dynamically it is awful, with loud > clucking noises on direction changes and horribly wavy marks left on the > pieces milled at those changes. Giving a shove on the table, I can measure > more than +/-0.01" of this "springy" backlash, but moving the screw to a > normally unused position I can only measure about 0.001". This is a big > fixed screw (about 2" diameter and more than 14ft long) with rotating nut, > is there any hope of fixing it? I'm considering trying to send the screw > out to one of those screw refurbishing places. The machine manufacturer > quoted us over $18,000 to replace it. > > Todd Zuercher > P. Graham Dunn Inc.<http://www.pgrahamdunn.com/index.php> > 630 Henry Street > Dalton, Ohio 44618 > Phone: (330)828-2105ext. 2031 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
