Re: Vacuum Table

--- In CAD_CAM_EDM_DRO@yahoogroups.com, H & J Johnson <hjjohnson@...>
wrote:

>
> No extra bracing will be required for a vacuum table [over a

non-vacuum] as there is no 'atmoshereic pressure difference' between
the two. As was mentioned the pressure is applied both to the top and
bottom of the surface so no 'net change' occurs. The beauty of a
vacuum is the immense pressure which can be obtained WITHOUT have to
build the table extra heavy.

>
> FWIW
> Jarrett
>
>
>
> ----- Original Message -----
> From: JanRwl@...
> Date: Thursday, February 15, 2007 1:35 am
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Vacuum Table
>
> >
> > In a message dated 2/15/2007 1:26:51 A.M. Central Standard Time,
> > penguin@... writes:
> >
> > You'll need to design internal bracing in the hold
> > down table to resist this, or it will implode (or more likely,
> > sag a bit).
> >
> >
> >
> > What about the force the atmosphere imparts pushing UP on the
> > same
> > table-surface??? Won't the table be blown through the roof?
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
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HI Group,
I think the original question about this subject was if anyone had
pictures or plans for a vacuum table.
The replies seem to indicate people are referring to different designs.
If a vacuum table is designed as a box with a hose to a vacuum pump
and a few pin holes on one face it needs to be strong enough to
contain the vacuum or it will deflect due to atmospheric pressure.
Does anyone have pictures or plans for a vacuum table ?
Thanks,
Glen.