RE: [CAD_CAM_EDM_DRO] Opened ballnut...

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Abby Katt
> Sent: Friday, 20 April 2007 6:45 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Opened ballnut...
>
> OK, so I've opened the ballnut.
> I'm actually rather glad I did.. it's really not as scary as
> I thought (putting it back together may be though).
>
> What I've found is that it does indeed consist of two halves.
> The front half is a complete mini-ballscrew. This turns
> lovely when freed from the main block, so I won't even bother
> removing the balls from this. In fact, I've put tape on the
> end of the ballscrew to stop it twirling itself off when it's
> placed vertically (it really goes!).
>
> The rear-section seems to be screwed into the main block - I
> removed all the balls from this. They all appear to be the
> same size of a tiniest smidgen over 4.5mm. I checked them
> with a micrometer along different axis as best you can with a
> sphere.. and they seem spherical to me.
> Thanks for the advice of doing this on the floor Ballendo!
> That was a lifesaver.. balls did indeed skitter and roll
> away.. all 100mm away.
> Much better than if I'd done it on my hard wooden table....
>
> Now my guess is that the rear nut is screwed into the main
> block (there seems to be no other way in which they could be
> attached) and that this takes up the backlash. Certainly it
> is this which is causing the friction. If all comes to nought
> I'm quite tempted to just run with the balls removed from this.
>
> I can now see why my spraying loads of WD40 into the front
> ballnut made no difference - it just wasn't getting into the
> balls of the rear one.
> I'll now clean these up, and see what the result is. :)
>
> Regards,
> Abby
>
>
>
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