Tiny vacuum pump

wrote:

In rec.aviation.owning Mark Mallory wrote:
: Briggs and
: Stratton lawnmower engine (we were trying to make our own freeze-dried
: food...)

Probably like my dad's 1939 Oliver 60 tractor. It has a stopcock
on the intake manifold for milking one cow at a time if the electricity
went out. Probably too big to fit on your desk though...

In our case, we figured that for our purpose we needed a pretty high vacuum -
like 1/200 atm or so (below the triple point of water.) Because the pressure
depends on the compression ratio, the original Briggs & Stratton cylinder head
wouldn't work; we replaced it with our own cylinder head made from 3/8" aluminum
plate, with "flapper valves" made from an old inner tube (this gave a
near-infinite compression ratio.) We installed a 7 inch pulley on the
crankshaft and turned the B&S with an electric motor.

We were able to inflate balloons in a mason jar with the thing, but that was
about it. I seem to remember we tried freeze-drying some banana slices, but the
results weren't too impressive.

Take one of these apart:

http://www.ballsonline.com/details.a...t=136&path=136

then reverse the little flapper valve to make it suck instead of blow...

--
Dan D.



..
"Jim Weir" wrote in message ...
Does anybody have an idea on how to make a tiny little vacuum pump on the order
of an aquarium pump or so that will draw just a few inches of water? Preferably
110, but I can rig up a 12 volt supply if necessary.

The reason I say this is that I'm getting ready to pack a fairly large number of
bags with used but serviceable engine parts (valves, pistons, etc.) and I'd like
to put each part in a "baggie" (sandwich bag or equivalent) along with a little
preservative oil, and then suck the baggie down with a football needle stuck
into the top closing mechanism just before sealing.

Thoughts?

Jim
Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com

On Sat, 17 Jan 2004 19:03:40 GMT, Tom Pappano
wrote:

Jim Weir wrote:
Does anybody have an idea on how to make a tiny little vacuum pump on the order
of an aquarium pump or so that will draw just a few inches of water? Preferably
110, but I can rig up a 12 volt supply if necessary.

The reason I say this is that I'm getting ready to pack a fairly large number of
bags with used but serviceable engine parts (valves, pistons, etc.) and I'd like
to put each part in a "baggie" (sandwich bag or equivalent) along with a little
preservative oil, and then suck the baggie down with a football needle stuck
into the top closing mechanism just before sealing.

Thoughts?

Jim
Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com


Those aquarium air pumps pull air from around the case.

How about placing one inside a cheapo tupperware-type container with a
"suck" port mounted on the container, you'd also need to run a "blow"
port from the pump's normal output through the container wall.

HTH


Mike Patterson
Please remove the spamtrap to email me.

Now *that's* clever. I admire clever.

Jim



Mike Patterson
shared these priceless pearls of wisdom:


-
-Those aquarium air pumps pull air from around the case.
-
-How about placing one inside a cheapo tupperware-type container with a
-"suck" port mounted on the container, you'd also need to run a "blow"
-port from the pump's normal output through the container wall.
-
-HTH
-
-
-Mike Patterson
-Please remove the spamtrap to email me.

Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com

On Fri, 16 Jan 2004 08:41:07 -0800, Jim Weir wrote:

Does anybody have an idea on how to make a tiny little vacuum pump on the order
of an aquarium pump or so that will draw just a few inches of water? Preferably
110, but I can rig up a 12 volt supply if necessary.

Thoughts?

When I was in college, the chem labs used a venturi on water faucets
to create a vacuum for filtration. I've tried Google to show where to
get them, and failed.

Just a little attachment with a side barbed fitting ... good vacuum
levels, CHEAP, and appropriate for one who utilizes Bernoulli in other
ways ...

now where do I get it?

Jim,

That air compressor sprayer I gave you a couple of years ago is just a
venturi. Use the liquid imput end to generate the vacuum. Unless ypu lost
it, you already have what you need.

--
Bob (Chief Pilot, White Knuckle Airways)


"John Mireley" wrote in message
...
Jim Weir wrote:

Does anybody have an idea on how to make a tiny little vacuum pump on
the order
of an aquarium pump or so that will draw just a few inches of water?
Preferably
110, but I can rig up a 12 volt supply if necessary.



If you have a compressor, use a venturi vacuum generator.
Harbor freight has them for about $10 from time to time.

I built a few of those for a hot tub several years ago.
Being a frugal and saving kind of guy, I've still got most
of them tucked away. Simple construction really and capable
of several inches of mercury.

John

On Mon, 19 Jan 2004 21:36:37 -0500, GeorgeB
wrote:

On Fri, 16 Jan 2004 08:41:07 -0800, Jim Weir wrote:

Does anybody have an idea on how to make a tiny little vacuum pump on the order
of an aquarium pump or so that will draw just a few inches of water? Preferably
110, but I can rig up a 12 volt supply if necessary.

Thoughts?

When I was in college, the chem labs used a venturi on water faucets
to create a vacuum for filtration. I've tried Google to show where to
get them, and failed.

Just a little attachment with a side barbed fitting ... good vacuum
levels, CHEAP, and appropriate for one who utilizes Bernoulli in other
ways ...

now where do I get it?

"GeorgeB" wrote in message ...

When I was in college, the chem labs used a venturi on water faucets
to create a vacuum for filtration. I've tried Google to show where to
get them, and failed.

They sell them at WAL*MART and other pet stores for draining aquariums.
Also had a similar device to drain the waterbed back when those things were
fashionable.

Check Fisher Scientific under "aspirator".

"GeorgeB" wrote in message
...
On Fri, 16 Jan 2004 08:41:07 -0800, Jim Weir wrote:

Does anybody have an idea on how to make a tiny little vacuum pump on the
order
of an aquarium pump or so that will draw just a few inches of water?
Preferably
110, but I can rig up a 12 volt supply if necessary.

Thoughts?

When I was in college, the chem labs used a venturi on water faucets
to create a vacuum for filtration. I've tried Google to show where to
get them, and failed.

Just a little attachment with a side barbed fitting ... good vacuum
levels, CHEAP, and appropriate for one who utilizes Bernoulli in other
ways ...

now where do I get it?

On Mon, 19 Jan 2004 17:45:27 -0500, Mike Patterson
wrote:

On Sat, 17 Jan 2004 19:03:40 GMT, Tom Pappano
wrote:

Jim Weir wrote:
Does anybody have an idea on how to make a tiny little vacuum pump on the order
of an aquarium pump or so that will draw just a few inches of water? Preferably
110, but I can rig up a 12 volt supply if necessary.


Just get a little "mityVac" hand pump used for testing vac advance etc
on cars.
Or if you really need it mechanized, make an adapter for your vacuum
cleaner with an adjustable bleed

The reason I say this is that I'm getting ready to pack a fairly large number of
bags with used but serviceable engine parts (valves, pistons, etc.) and I'd like
to put each part in a "baggie" (sandwich bag or equivalent) along with a little
preservative oil, and then suck the baggie down with a football needle stuck
into the top closing mechanism just before sealing.

Thoughts?

Jim
Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com


Those aquarium air pumps pull air from around the case.

How about placing one inside a cheapo tupperware-type container with a
"suck" port mounted on the container, you'd also need to run a "blow"
port from the pump's normal output through the container wall.

HTH


Mike Patterson
Please remove the spamtrap to email me.