There are companies that regrind worn ball screws then stuff them with
oversized balls, at much lower cost than a whole new ballscrew. ISTR reading
some claims of making a rolled screw as precise as a new ground one since
they're precision grinding the old rolled surface.
Whether or not it's cost effective to have a screw rebuilt would depend on how
easy or not it is to install a new one. If your machine has something crazy
custom then a regrind could be best. Regrinding would also be best if the screw
is worn a lot more in one area. Oversized balls that take up nearly all the
lash in the less worn areas will still leave the most worn spot loose.
On Sunday, September 13, 2020, 3:34:26 PM MDT, Gene Heskett
<ghesk...@shentel.net> wrote:
On Sunday 13 September 2020 15:18:57 andy pugh wrote:
> On Sun, 13 Sep 2020 at 17:29, Gene Heskett <ghesk...@shentel.net>
wrote:
> > Worse yet, if that screw does get damaged, I have no clue where to
> > source another like it. That small has never shown up on fleabay.
>
> https://www.automationshop.co.uk/mec
>
No, they don't. 1 16mm, the smaller ones are all out of stock from this
side of the pond. These nuts have flanges that would preclude using them
in the available space. The ones I am using aren't threaded or flanged,
so I had to make cages to fit them. They are 19mm in diameter plus
return tubes. Looks like warmed over hell, but the backlash is about a
thou.
> Or, second-hand from Korea: https://www.ebay.com/itm/193192165382
At least they are honest, all worn out, the precise is used up.
These were worn some but I found a bag of oversized balls ,0635 in
diameter, .001" oversized, and re-stuffing them was a bit tedious but I
did get it done. Took nearly all the backlash out of them.
Cheers, Gene Heskett
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