Re: Vacuum table

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Denis Casserly <denisc1@t...>
wrote:

> I haven't tried it but from what I've read porous hold down boards

are used by

> guys who cut out plywood frames for the furniture manufacturing

industry.

> It's very inefficient - you need a huge vacuum pump to overcome the
> resistance to airflow through the MDF, so I think the table is zoned

up with

> valves controlled with a local PLC which monitors the spindle

position and

> closes off all the other zones, in order to keep the pump size down.

The

> pumps are huge and expensive because they deal with a 4 by 8 sheet

of board.

> There an outfit in Langley BC that sells routers using it (Pacific

Technology

> or some name like that) You could also check out a website named '

Woodweb' -

> that's where I first heard of it.
> cheers,
> Denis Casserly
>
> On August 14, 2005 03:21 pm, davegsc@t... wrote:
> > 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
> >
> >
>
> <sniped by moderator, please remeber to trim your posts>

Once the work is placed on the top, there is no air flow, only a vacum.

the size of the vacuum is really only to control the speed the vac is
pulled. once there is a vacuum and no leaks, you don't even need a
pump any longer.

Dave