Gentlemen,
  My goal would be:

  A spring loaded lip seal at the bottom of the gearbox - above the spindle
bearings. Size the seal or bearing surface for approximately 1/2 the
recommended interference fit to minimize heat in the seal. If you are
turning the head over then a seal at the top would be in order.

  Kluber lube in the spindle bearings loaded at about a 10% (by volume
inside the bearing) grease load.

  A labyrinth seal outside the spindle bearings.

Will last forever

Oil bath bearings in the bottom of a gearbox are bathed in ALL of the wear
particles of the gear train - not a good situation.

thanks
Stuart


On Wed, Sep 4, 2013 at 5:23 AM, John Thornton <bjt...@gmail.com> wrote:

> The Hardinge CHNC turret uses those quad rings to seal the turret and
> the housing.
>
> JT
>
> On 9/3/2013 11:33 PM, Gregg Eshelman wrote:
> > On Tue, 9/3/13, andy pugh <bodge...@gmail.com> wrote:
> >
> >   I don't think there is room inside the bolt circle for any
> >   sort of lip
> >   seal though, and I am rather wary of Gene's idea of an
> >   O-ring, I can
> >   see it managing to pull out a bight and tie itself in a
> >   knot.
> >
> >   --
> >
> > There's o-ring cord, in various profiles. Cut a scarf joint and glue
> with a "special" glue that's most likely just cyanoacrylate. The trick is
> getting the length exactly right. A square profile o-ring would be more
> likely to stay put and work well with a sliding shaft or quill.
> >
> >
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