Re: re vac forming

I have done some composite wing vacuum bagging and used one of the old
commercial freon tanks as a vacuum reservoir and it held 24" hg no problem.
I now use a section of 4" PVC pipe with endcaps for my vacuum tank and I
have tested it to 24" hg with no problems.


Tim
[Denver, CO]

> -----Original Message-----
> From: Jon Anderson [mailto:janders@...]
> Sent: Tuesday, June 15, 1999 10:56 PM
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: Re: [CAD_CAM_EDM_DRO] re vac forming
>
>
> From: Jon Anderson <janders@...>
>
> MIADsgns@... wrote:
>
> > Any suggestions on buiding the pump with meter, sources for
> > the meters, hardware etc.?
>
> I don't see any reason you can't use that tank as a vacuum plenum. Don't
> know how many inches of vacuum you can pull with a shop vac, but the
> tank will help with volume.
> Valving to take the shop vac out of the loop could be a simple PVC ball
> valve from the hardware store. Costs should be reasonable. Used ought to
> work just fine if you can find it.
> You can tolerate a slight leak here, you just don't want a high
> vacuum/low cfm pump trying to suck air back through the shop vac while
> it's running.
>
> Some old friends have a business in town (Maier USA) making accessories
> for dirt bikes and ATV's, vacuum forming plastic.
> It's a trip watching a droopy sheet of plastic turn into an ATV
> seatbase/fender in a matter of seconds! Their Thermwood 5 axis gantry
> router is pretty neat too...
>
> Jon
>
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