Re: Request help from group

Stan,

I don't understand all your design parameters, but I accomplished
something similiar without too much expense and work.

In my case it was to power a Diacro rotary bender. I wrapped the OD
of the table with a length of roller chain (kind of like making the
OD into a gear). The rotation was powered by by a hydraulic motor
with a small sprocket which meshed with the OD "gear". Same thing
might be done with a pnuematic motor, although hydraulics provide
much, much more possible torque.

Incidently, In case you find a way to do your project with an air
cylinder, most all pnuematic cylinders and components can be run off
low pressure hydraulics since the newer seals will withstand the
effects of the hydraulic fluid. With hydraulics you can safely run
the cylinders up to at least 250psi making for a much shorter lever
arm. Hydraulic pumps can be a problem finding at a bargain price,
I've been told auto power steering pumps make a good substitute
(never tried it myself).

Doug

--- In CAD_CAM_EDM_DRO@y..., STAN MCDONALD <SMCDONAL@K...> wrote:
> I never heard of htis rotary cylinder. What I am atempting to
eliminate is ME
> pulling on a 48" bar and forcing the table around..
> Thanks
>
>
> Smoke wrote:
>
> > Better yet, maybe I can describe it...others might be interested
too.
> > Instead of using a standard push/pull cyklinder, incorporate a
rotary air
> > cylinder into the bottom of the table.
> > These can be puchased or you could build it into the table. The
1-1/2"
> > thickness of the table would be plenty to allow for this and you
could
> > eliminate the arm sticking out from the side.
> > You could also build in adjustable stops to regulate the amount
of travel
> > tyou require. Travel can be well ove 300 degrees using this
method.
> >
> > Smoke
> >
> > >Hello list I am working on a project and need to request your
assistance. I
> > >am atempting to make a rotary turning table to be driven by an
air cylinder
> > >and I need to have the cylinder be retracted and then when fully
extended
> > >have the table have moved min 200 degrees or more. The problem I
have run
> > >into is when the cylinder has moved the table 180 degrees ( how
do we
> > >position the cylinder so that we would not need to stop remove
the cylinder
> > >and then retract the cylinder with it on the other side of
center?
> > >
> > >The table is a 1-1/2" thick plate cut round 14-15" in dia made
of steel. I
> > >have an arm stuck out one side to connect whatever to and the
whole thing
> > is
> > >resting on some bearings for movment (similar to a car front
axel).
> > >
> > >Thanks
> > >
> > >Stan
> > >
> > >
> > >
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