How worn are the ball screws? There are companies that rebuild them for much less than the cost of new. Sometimes all that's required is replacing the balls with very slightly larger ones. In some cases the screw will require a very light regrind, plus larger balls.
Many ball screws use two sizes of balls, with every other ball undersize as "spacers". That's to reduce drag but it also reduces the load capacity. Rebuilders can install new balls all the same size. If your screws have spacer balls, it may help to replace them with ones the same size as the larger ones. You'll most likely have to use one or two fewer. If you want to try it yourself, there are vendors on eBay selling hard steel bearing balls of pretty much every diameter you can think of. Might be some online calculator to help select the amount of size increase to try to remove lash in a ball screw. I've heard of people doing this with brand new ball screws to tighten them up as an attempt to compensate for buying a cheaper grade. If the screw is unevenly worn, then putting in larger balls can cause binding or locking up in the less worn parts. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
