Re: Air assist on Series II knee?

Tim,
I does appear to work the way you describe. Unless there is a
center jack within the screw. I run mine at about 50-65lbs
so far with only small loads on the table. My bellows cover has
rotted away so I removed it. The screw portion does rotate
and the nut is fixed. I'm thinking about getting an automotive
'shock absorber' boot cover and slitting the side to replace the
old one, then working out some way to reclose it w/ overlap.
or maybe just sew up a zippered conical rubber cover that
will keep chips off the screw .

-Lee

--- In CAD_CAM_EDM_DRO@y..., Tim Goldstein <timg@k...> wrote:
> It seems to me that if arranged as follows it would relieve the
motor from
> the weight of the table.
>
> -----|
> | |---
> ////|||///////
> | |---
> -----|
>
> Turned sideways (OK I stink at ASCII art). Cylinder at left with a
piston
> that is free to rotate in the cylinder (attached firmly to the
screw). The
> nut is attached to the top of the outside of the cylinder. The
screw itself
> would be bearing the full weight of the table, but the amount that
is being
> carried by the nut would be offset. The screw is actually rotated
from the
> top to raise and lower the table and the nut is fixed. The top
bearings that
> attach the screw to the table would also be carrying full load.
>
> Of course if there is anyone that actually knows how this works we
could end
> a lot of speculation.
>
> Tim
> [Denver, CO]
>
>
> > I would be suprised if they did it this way. This would not
> > relieve any pressure from the screw.
> >
> > Tim Goldstein wrote:
> >
> > > That is a novel idea. It really would not require that much
> > pressure if the
> > > screw was attached to a larger piston underneath. The
> > piston would also keep
> > > air from leaking out the cylinder. From the arrangement of
> > the parts this is
> > > a likely scenario.
> > >
> > > Tim
> > > [Denver, CO]
> > >
> > > > Hmm, is there any chance the screw itself is the
> > cylinder, or rather
> > > > the piston? I'm thinking probably not, as it would require an
> > > > unreasonably high air pressure to lift a heavy knee with the
cross
> > > > section of a typical screw. It would of course leak a
> > bit, but the
> > > > leaks would keep chips out of the nut.
> > > >
> > > > Chris
> > > >
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>
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