I bought two ballscrews on ebay. Both are nice looking
NSK parts. One is silky smooth and the other is slightly
gritty. Is is possible/advisable to disassemble, clean
and relubricate the gritty one? Any suggestions on the
best grease to use?

On Jan 27, 11:42*am, Jim Stewart wrote:
I bought two ballscrews on ebay. *Both are nice looking
NSK parts. *One is silky smooth and the other is slightly
gritty. *Is is possible/advisable to disassemble, clean
and relubricate the gritty one? *Any suggestions on the
best grease to use?

Dented races from overstress can cause a 'gritty' feel; hope
it's not that, but just some dirt.

Find a fitting and force lube into it until the grit washes away.
It's NOT recommended to disassemble (sometimes those
balls are installed in oversize/undersize alternation, and
it's hard to reassemble correctly... disastrous to reassemble
the other way).

If there's a preload adjustment, it might pay to loosen it
while the gritty one is getting flushed.

If you can, find out from NSK what the recommended grease
is. Grease is cheap.

Jim Stewart wrote:
I bought two ballscrews on ebay. Both are nice looking
NSK parts. One is silky smooth and the other is slightly
gritty. Is is possible/advisable to disassemble, clean
and relubricate the gritty one? Any suggestions on the
best grease to use?
My solution for cleaning ball nuts is to wipe axle grease on the
screw, run the nut across the screw, wipe remaining grease off
other side of screw. Observe rag for shiny flecks, if visible,
repeat process. This has worked quite well to clean out several
ballscrews that were of the kind that could be quite difficult to
disassemble and reload the balls into.

Jon

"Jim Stewart" wrote in message
...
I bought two ballscrews on ebay. Both are nice looking
NSK parts. One is silky smooth and the other is slightly
gritty. Is is possible/advisable to disassemble, clean
and relubricate the gritty one? Any suggestions on the
best grease to use?

DON'T TAKE THEM APART!!! Wash them out repeatedly or send them out.