The comments were telling.... a big compressor is needed seems to be a theme
and I thought this somewhat negative one was amusing...
"i bought this to replace compressor in a friends car so i wouldnt have to
carry my $8000 snap o unit around. and wow...my girl friend can pull a
deeper vacuum than this thing, even used a 60 gallon 2 stage compressor."
Perhaps this one...?
Yes... but you don't need the big compressor which may or may not be an
issue for you. My PC compressor would never keep up but my father's big
Ingersoll Rand (that came out of a meat packing plant) would. I'd need 3
miles of hose though. ;~) That makes the self contained HF unit more
attractive. I've been exploring options too and am taking cues from some of
the wood turners I know. They have gotten rebuilt high-end vacuum pumps for
use as vacuum chucks. Most of those guys are "cheap" but they are engineers
so I think they probably over-researched things before settling on this
solution. Some of them are vocal about being turners because they can get
most of their wood for free. ;~)
Is that your normal holddown method? Wow, 25 microns is a superb
unit. We used to try to get at least 28 inches of mercury for auto
air conditioning system pulldown after repairs. That's 49,000 microns.
Most of the time, we'd get 29", but 28 was minimum, IIRC. It has been
30 years since I've done one.
Those seem like a complete waste of energy, air, and compressor life,
not to mention that they're damned loud. I've only heard one once, a
$10 HF job, and that was enough to dislike the whole concept.
Air tanks for the bags sound like a great idea for quick control of a
Intentional misspelling for 'internet' usually used when making fun of
people who are technologically impaired.
Oh, that's what that means.
Good ideas alter the power balance in relationships, that is why
good ideas are always initially resisted. Good ideas come with a
heavy burden. Which is why so few people have them. So few people
can handle it.
-- Hugh Macleod
When I saw an example of vacuum veneering in a book my first though was
- this looks like those zip-lock vacuum bags. Why wouldn't they work?
I mean tons of pressure is not needed - mostly even pressure. But those
are just thoughts since I have never tried vacuum veneering.
They *do* work for small projects (anything that will fit inside the
bag...). I've done several projects this way. I never got around to
cutting a valve out of a bag and using it for a bigger project. The
only problem is that the valve section needs to be on a flat area for
the valve to seal (it's a simple one-way flap valve). I've also used
a Mityvac hand punp (http://www.mityvac.com /), but it will make you
Two things you need to know.
1 will this require the refrigerant as a lube.
2 how noisy is this. I have a 2 stage medical pump that I use. It's so
3 can it run full time. If not you can build a reservoir which will make
it more intermittent.
Good luck, seems like the right amount of pull.
On 2/24/2012 8:07 AM, Doug Miller wrote:
Look in the yellow pages for someone who services or rebuilds small offset
duplicator printing presses. These presses use vane pumps to create a vacuum
to lift the paper into the press. Vane pumps last forever, a press can run
two shifts a day for 10 years on the same pump with little service. These
same pumps are also used for vacuum contact film duplication by printers and
for vacuum plate making, which is really the same as veneering. The pump
creates a vacuum between film and the printing plate and holds it until the
plate is "burned", 5 to 10 minutes. Used ones can be cheap if you shop
around. It will last forever if you keep the sawdust out of it.
I don't know what you mean by "medium" vacuum. Most of the pumps used in
small printing equipment will develop a vacuum of 20 inches of mercury, some
more, how much do you need? The one I have is made by Gast.
On Sat, 25 Feb 2012 04:20:29 +0000 (UTC), Doug Miller
20 inches is still 144 lb/sq foot. More than adequate to keep most
veneer from curling. Too much vacuum forces all the glue out of the
joint (or draws it through the pores in woods like red oak - making
Your decimal point's in the wrong place. 10 psi = 1440 lb/sq ft.
I don't know enough about vacuum veneering to know whether that
makes a difference or not, I was just pointing out that there is a
substantial difference in pressure between 20 inches of vacuum,
15 inches is adequate for MOST veneer jobs. 6 inches does pretty good
for vacuum bagging fiber glass. A shop vac will produce 6 or 7 inches
on a good day. What about combining the shop vac to pull the bag down
quickly, then draw it down the rest of the way with a diaphragm pump
or a Gast type pump - or even an old refrigerator unit.
see: http://www.paragoncode.com/shop/vacuum_pump /
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