I have a CNC mill that has a one-shot oiling system that, in addition to lubricating the ways, lubricates the ballscrews; and everything protected by waycovers. I also have a CNC lathe which has protected ballscrews but no provision for oiling. My question is "Are ball screws designed to lubricated?" It seems to me they are essentially bearings and should receive some type of lube, but I see so many small machines running with no provision for lubrication.