That would seem to be for a low vacuum application:
Atmospheric pressure 760 torr 101.3 kPa
Low vacuum 760 to 25 torr 100 to 3 kPa
Medium vacuum 25 to 1×10-3 torr 3 kPa to 100 mPa
High vacuum 1×10-3 to 1×10-9 torr 100 mPa to 100 nPa
I'd go for it. Rotary vane pumps aren't rocket science. I doubt it
would pull 75 microns, but it should do what it was intended to, pull
moisture out of refrigeration lines. Just keep the oil fresh. Better
yet, invest in some high grade vac pump oil. If you can replace the
1/4" fitting with 3/8" and use corresponding sized hose, that would
work better. Besides, the worst you can say about it is, "it sucks".
That's what rotary vane pumps do when they've pulled a vacuum. The
smoking is oil vapor backstreaming. You should have said what you were
going to use it for in the first place. I thought you were going to
use it for pumping down refrigeration lines, its intended purpose.
Maybe HF will take it back. Tell 'em you didn't know about
backstreaming and can't tolerate any oil on the work.
Were you operating the pump with no load or connected to the intended
I've rebuilt several direct and belt drive types. They can be a bit
noisy and smoky. Give it another try with the inlet completely blocked
(max load). Better yet, connect a vacuum gauge to the inlet and see what
its actually pulling.
I use a recycled refrigerator compressor with shop-built vacuum pucks
for holding (not small) workpieces for CNC routing with a 5 hp spindle.
The higher-volume shops like the vacuum pumps from
They're more expensive but those who have 'em, love 'em.
You are paying insane amounts of money for vacuum overkill. A simple
vacuum cleaner will provide all the vacuum mecessary for holding down
verneer pieces, even lager ones. The mechanism at work here is not
vacuum. but the air pressure acting on the pieces to be held. IOW,
it's not the level or rate of vacuum, but the atmospheric pressure on
the other side of the work. You can buy a $10 million dollar vacuum
system, but the air pressure holding down the pieces will never exceed
I don't do veneering, so you won't get any argument from me in that context.
Joe mentioned production routing small parts - and in that context, the
choice of equipment will depend very much on the particular set-up
(whole table, with vacuum being pulled through a permeable spoilboard;
vacuum pucks on an impermeable spoilboard; or something in-between); the
material being routed - parameters will be very different for, say,
Lexan, baltic birch, and MDF workpieces; and how aggressive the feed is.
I've been pretty happy with pucks and an old recycled refrigerator
compressor - but I don't use vacuum hold down for parts under 16 in^2,
and I can't even consider vacuum hold-down for leaky materials like 1/4
in MDF. (If I really needed to do that I'd spring for a real vacuum pump
- probably a reconditioned Becker.)
I have a how-to for making inexpensive vacuum pucks at
http://www.iedu.com/DeSoto/Projects/VacuumPuck/ - I just daisy-chain 'em
together and connect to the intake side of the refrigerator compresor
with 3/8 in vinyl tubing.
For non-production (very small) quantities, I'm more likely to use
carpet tape - or for in-between (small) quantities, a purpose-built
clamping fixture like those shown at
Bill Noble, one of the participants of rec.craft.woodturning, usually
has a few reconditioned Gast pumps on his web site at a decent price:
220V, single phase, weighs 30 pounds
I measured 22 inches vacuum
Oilless carbon vane pump, if I read the spec sheet right, this is a 3.2
CFM free air flow pump, 10 psi max, 26 in vac max, so my 22 inch
measurement says it's in really good shape.
manual is here:
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