On 04/12/2021 09:48 AM, Todd Zuercher wrote:
Those here who have had to deal with a worn out ball screw.
I'd dig into the works and examine everything. It does NOT
sound like simple wear.
The rotating nut likely runs in a pair of either
angular-contact bearings or tapered roller
bearings. There will be a preloading arrangement to
constrain the nut. Also, the
screw is usually fixed at both ends. If the clamp has
gotten loose at one or both ends, it could
allow some flex of the mount under load. Attach a dial test
indicator to the slide and
read against the end of the screw, and watch for movement
when you apply load.
Some old ballnuts were actually TWO completely separate nuts
that were preloaded against
each other with Belleville washers. It is possible some of
the Bellevilles have cracked.
Also, they often used dowel pins to align the two nuts
rotationally. If one of the dowels has
cracked, that could cause this kind of issue.
Jon
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