RE: [CAD_CAM_EDM_DRO] Re: How hard to rotate should preloaded ballnuts be, anyway?

Most those that preload by backing up two ball nuts would be using same size
balls, there is no need to use different size balls, this would just make
production expensive.

I stripped one of the ball screws on may machine, all balls miked to the
same size, though one of the ten separate track is one ball short.

I have also pulled five other precision dual nut ball screws apart now, and
they all had same size balls.

Before you ask, no I don't get a thing out of taking these apart, it seems
word got around that I was able to clean mine, and several people have
wanted a suspect dirty / failing screw on theirs cleaned. So far all have
had good balls, just needed a clean, and in the short term are working OK,
with low backlash.

Regs Mark



Dr. Mark Vaughan Ph'D. B.Eng. M0VAU

Managing Director

Vaughan Industries Ltd, reg in UK no 2561068

Water Care Technology Ltd, reg in UK no 4129351

Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
Phone/Fax 44 1872 561288

RSGB DRM111(Cornwall)

_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Harko Schwartz
Sent: 19 April 2007 04:59
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: How hard to rotate should preloaded
ballnuts be, anyway?



Anybody that removes the balls is nuts they are placed in a size varying
order to allow the balls to move and the preload shouldnt be to where you
can't turn the nut. You can send the screw out and be reballed and checked
out for a few hundred dollars.

On 4/18/07, Polaraligned <polaraligned@
<mailto:polaraligned%40optonline.net> optonline.net> wrote:

>
> The ballnuts should turn freely without any gritty feel.
> If you can, submerse the whole ballscrew/ballnut assembly in
> a solvent and run the ball nut back and forth to flush
> any foriegn particles out. It could be hardened grease
> combined with metal particles causing the problem.
> This method is recomended by Bridgeport in their BOSS CNC
> manual to flush the ballscrews.
>
> Scott
>
> --- In CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>

DRO@yahoogroups.com <CAD_CAM_EDM_DRO%40yahoogroups.com>,

> Abby Katt
> <cncgroupnospam2@...> wrote:
> >
> > Howdy Folks,
> >
> > I'm recomissioning a neolithic ORAC CNC lathe with modern CNC-controls
> > (Mach3/new electronics etc) but in cleaning it up have run into a
> > mechanical conundrum. The ballscrew along the long-axis is really stiff
> > and gritty to turn, I've been cleaning it up with WD40, but so far
> to no
> > avail. I'm beginning to come to one of those deadly-fatal conclusions
> > where I give up and let all the little balls out...
> >
> > My question is - how hard is to to rotate by hand preloaded ballscrews?
> > (I assume this thing is preloaded, it has a massive ballnut) It has
> some
> > screws on the tubes through which the balls recirculate. Is it easy to
> > open this and remove/clear/reinstall the balls, or is this just
> > spherical-based-madness?
> >
> > The mounting block is also under tension, and also quite hard to turn..
> > how tight should this really be?
> >
> > Oh, I have some pics of it here too:
> > http://www.silverka

<http://www.silverkatt.co.uk/Lathe/Default.aspx?Page=2>
tt.co.uk/Lathe/Default.aspx?Page=2

> >
> > BTW> This machine has been in storage for 10+ years...
> >
> > Regards,
> > Abby
> >
>
>
>

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