Re: [CAD_CAM_EDM_DRO] Air assist on Series II knee?

Yea, that would work, and I can see why you would need to find out how it REALLY works pretty soon. Have you tried calling
Bridgeport?
Also there is www.machinerybrochures.com but you will not be happy with their prices.
I have never seen an OEM Bridgeport that uses that system, or I would help you more.
If I come across one, I will let you know.

Tim Goldstein 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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