gritty ballscrews

[Voicecoil]

Thanks for the advice and the link to the video; I don't think it's oversized balls as the roughness it intermittent, sometime you can do a turn or 2 OK, then suddenly it graunches and feels dog rough. Also looking at my hands after handling them I see tiny flakes of swarf which points to bits getting into the nuts. Hopefully as I've caught it before running them with motors there won't be any damage, but I'll take a close look at the screw for signs of scratching. Cleaning and repacking looks like a job for a long winters evening, though with the amount I have on at the mo. I could do without it!