RE: [CAD_CAM_EDM_DRO] Re: Vacuum table

A couple of years ago, I read somewhere that MDF is porous enough that
you can provide a vacuum right through it with a ShopVac - no need to
drill millions of holes in your bed.

If that's true, that would make it easy to replace sacrificial surfaces.

Anyone tried this?

Dave


-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of turbulatordude
Sent: Sunday, August 14, 2005 10:55 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Vacuum table

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "hippodan" <DSchwartz@D...>
wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "baccus61" <richmcm@a...>

wrote:

> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, alipavsky@c... wrote:
> > > Does anybody have advice on building a vacuum table?
> > >
>
> > I would love to be able to put you onto some of these but I have
> > been trying to find some for about 1 1/2 years now with no luck.
> > Richard.
>
> Hey Guys,
>
> These are called "ball valves" which makes it really hard to

search for them since there are

> also "ball valves" which are completely different. In any case,

here's what you're looking for.

> Enjoy!
>
> -Dan
>
> http://www.m-powertools.com/products/vacuum/ball-valves.htm

I had thought about the idea for PCB work where one drills holes,
potentially losing the vacuum.

One way it to have a valve that will seat itself with high air flow.
so it would close itself off when a drill hole opened it to air.

I also thought about countersinking all the holes and dropping in
flat head screws. they could be O-ring type so would seal any unused
sections.

remove the vacuume and they could come out with a magnet. ( no brass
or stainless.)

Dave






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