Re: [CAD_CAM_EDM_DRO] Mcmaster-Carr Ballscrews

Ok Deon,
I had my fun trying to repair a pre loaded Bridgeport ball screw that somebody intelligent
took apart.
And it was screwy!
If you use a compressible spring (like an O-ring) in between the nuts and don't
block outward movements of the nuts you have one direction smooth with play
as soon you overcome the pre load.
And the other direction stiff and hard. You even may damage the nuts and screw.

If you use hard springs it is very hard to adjust and extremely easy to overtention the nuts.
So when I need ball screws I get them ready and never dismantle them.
Good Luck
Sven Hans-Egbert Peter

PS: Does live still somebody from the von Schimmerigck-family in Tanzania or South Africa?
Hans-Egbert was my granduncle who lived down there.

Deon Styger wrote:

> Hi all,
>
> There has been a lot of discussion lately about ballscrews. Everybody seems
> to agree that Mcmaster-Carr has a good deal on these. The problem however is
> that they don't supply preloaded nuts to take care of the backlash problem.
> I have picked up in the archives that some members like Dan Falck have
> overcome this problem by using two normal nuts in a special arrangement. The
> idea is to somehow apply an axial preload between them and keep them from
> rotating in relation to each other.
>
> Question 1: Is this an effective solution or are there some other hidden
> problems ascociated with this?
>
> Question 2: Can anybody give some indication of how they did this? I can
> probably figure some means of doing it out for myself, but it is always nice
> to see how other people did this and to learn from their mistakes. After
> all, this is what this group is there for!
>
> I (and a lot of other newbies) will appreciate any advice on this topic.
>
> Deon Styger
> (South Africa)
>
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