Re: attaching to leadscrew

Bill,

BS&A is Ball Screws and Actuators. The ActiveCam nut is a self adjusting
polymer nut available in acme and V-thread configurations. The big
difference with the ActiveCam nut is the method of adjustment. Every
self adjusting nut I've seen is spring loaded in some fashion, often by
keying the two nuts axially and providing a collar that is threaded to
one nut and torsionally loaded against the other nut. Under light loads
they are pretty much backlash free but under heavier loads there is the
backlash in the self-adjusting thread that can be taken up, creating
backlash in the nut. The ActiveCam has a cast SS sleeve with a 3 lobed
cam at one end that mates with a similar cam profile on one half of the
nut. It's torsionally loaded such that it rides up the cam faces and
takes up the slack between the two nut halves (which are keyed by a
hex). This arrangement removes the freeplay entirely since the SS sleeve
cannot be compressed. In practice, I found that the stock tension of the
torsion spring won't remove all backlash, I gave the SS sleeve a bit of
an added twist and am down to .0004-.0006 backlash.
BS&A can be reached at http://ballscrews.com or 1-800-882-8857.

Jon

WAnliker@... wrote:

>
> From: WAnliker@...
>
> In a message dated 6/15/99 10:46:24 AM Pacific Daylight Time,
> drewid@... writes:
>
> > BS&A ActiveCam nuts
>
> Could you elaborate on just what these are. And possibly the source, in case
> they are needed.
> My problem is connecting to the lead screws, when the handle I am replacing
> is the device taking the back lash out of the screw/nut. How is the best way
> to do this??
> bill
> List Manager
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