Re: [CAD_CAM_EDM_DRO] Vacuum Table

I suspect those pumps are a lot more than you need and may be worth quit a
bit. You might be able to resell them and get enough $ for your whole system
( if you can find the right buyer)
A shop vac will probably hold the parts. A good way to be to use a piece of
visqeen polyethylene film over the unused portion of the table, cut a hole
where the part goes and seal the edges with Dum Dum ( window caulking putty
strips) . Systems like this are commonly used to vacuum bag laminate
composite systems. these will have a bag over the part which you don't want
but the principle is the same. You want the type shop vac that pulls extra
air over the motor for cooling . Cheap units that pull the motor only with
the pumped air will burn out quickly in this type service. You want a lot
of holes at least equal in total area to the pump inlet size area. more is
better.
Jesse
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>From: "William Scalione" <wscalione@...>
>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
>Subject: [CAD_CAM_EDM_DRO] Vacuum Table
>Date: Fri, Jun 22, 2001, 8:40 PM
>

> Anyone out there ever built a vacuum table for a cnc router? I am
> in the process of building a new larger router and would like to add
> a vacuum part hold down to it. I picked up a couple of vacuum pumps
> at the NC State University surplus today although I am not sure if they
> will work for it yet. They are nice units direct drive high vacuum lab
> units. What I need to know is what size and number of holes would
> I drill in a 4' X 4' table? I will probably add some valves to section
> the table off, possibly go back and get another pump and section it
> into thirds, one pump for each section. Use only the sections I need
> to, depending on the size fo the work. I was thinking of using an acrylic
> sheet maybe 3/4" thick for the table. Will it require a large O-Ring
> around the edge or will just the holes be sufficent? Any tips would be
> appreciated.
>
> Thanks
> Bill
>
>
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