Hi James:
Thanks for the ideas. I will try take it apart and see what is
inside :-)
Regards
Harsha Godavari
"James Osbourne, Holmes" wrote:
> Perhaps this is a generally applicable solution: disassemble the pump and or
> flush it with alcohol. Lube it with a small amount of olive oil.
>
> This may get gummy, requiring occasional repeated cleanings. Perhaps
> someone has a better suggestion for the oil to use. For a simple tire pump
> with a leather gasket, replace the gasket with a new one and then use a
> non-toxic vegetable oil---not Canola. The gasket is simply a round piece of
> about 3/16" leather with a hole in the middle, and can be easily fabricated
> from a piece of leather.
>
> James-Osbourne: Holmes
>
> -----Original Message-----
> From: harsha godavari [mailto:[email protected]]
> Sent: Friday, March 08, 2002 8:19 AM
> To: [email protected]
> Subject: Re: CS>Airbrush Nebulizer Sys. Modification
>
> Brooks:
> I have a query regarding this pump (and may be others of this
> type). Is there any possible oil contamination from it? I understand that
> oil could be a problem with tire inflators.
>
> I was going to use a small oxygen tank and discovered that I need to get a
> medical prescription to rent one of those. I have one those tire inflators
> sitting around, not being used !
>
> Regards
> Harsha Godavari
>
> Brooks Bradley wrote:
>
> > During the past several days I have been
> > having an off-list dialogue with another list member...relative to
> > acquiring a smaller, less cumbersome unit that possessed some degree of
> > portability. I imposed on one of our technicians to investigate.
> > First, he tried to utilize several different aquarium pumps....none were
> > effective due to excessively low output pressure. Next he investigated
> > using the air discharge side of a high-quality vacuum pump. This was
> > workable, but cost-prohibitive due to requiring a high-efficiency pump.
> > Finally, through a serendipitous circumstance we chanced upon using a
> > little 12 vdc air pump available at Harbor Freight, for about $11.00..
> > It is manufactured by Campbell Hausfield and the stock number is #36688.
> >
> > The system is comprised of the 12 vdc tire inflation
> > pump, one double gang aquarium air-control valve (Walmart 2..00), about
> > 4' of silicone airline tubing from Walmart (#JM005..2.44 m size. Costs
> > about .90 for an 8' package); a conventional air compressor gage...0 to
> > 100 psi indicated; one 1/4" air brush coupler # P-1655 from Harbor
> > Freight....cost about .99.
> > Assembly procedure: Cut the 4' section of silicone
> > tubing into two equal sections; connect one section to either of the
> > output connections on the aquarium gang-valve; after screwing the
> > airbrush coupler on the pressure gage, slip the remaining end of of the
> > tubing coming from the gang-valve over the exposed end of the air brush
> > coupler. Next open the remaining control valve on the gang-valve
> > assembly to Full Open (fully counter-clockwise). Now connect the
> > remaining (other) piece of silicone tubing to the single INLET
> > connection to the gang-valve. Open the end-cover on the Air Pump and
> > remove the little orange-colored nozzle adapter and screw it into the
> > discharge-outlet of the Pump air hose....but only about 2 or 3
> > threads----any more and you cannot move the locking handle sufficiently
> > to unseat the discharge-line check valve (unless the check valve is
> > unseated, insufficient pressure will be achieved). Next, connect the
> > small end of the nozzle adapter well into the silicone tubing coming
> > from the gang-valve INLET. At this time what you have is the Air Pump
> > connected to the gang-valve; the gang-valve with one outlet valve
> > connected to the Air Pressure Gage and the other outlet valve OPENED and
> > vented to atmosphere.
> > Operation: With the system connected as outlined above,
> > connect the Air Pump to a 12 volt DC source (auto cigarette
> > lighter is excellent, since the furnished power connection is a
> > cigarette lighter probe). Any quality 12 volt battery charger may be
> > used, but be sure to connect to the power leads correctly. The center
> > contact on the cigarette lighter should be the (+) and the side-springs
> > should be the (-). With the system running as described the Air
> > Pressure Gage should be reading near Zero. Next, slowly close the
> > gang-valve outlet control (the one you left FULLY OPEN to atmosphere)
> > until pressure begins to indicate on the Gage; slowly continue closing
> > until the indicated pressure is 25 psi. If one or both of the hoses
> > blow off, just reinstall and push up snuggly. Friction pressure only
> > should suffice for 25 psi----if not, use some small-gage copper wire (28
> > gauge is fine) sections (about 1.5" length) and wrap them around each of
> > the tubing connections and twist securely. CAUTION: This little pump
> > can develop quite high pressures under "dead-head" conditions....so one
> > should increase pressure slowly, unless you want to blow hoses
> > everywhere. Once you have the system working at 25 psi you,
> > essentially, have it calibrated for the specific valve settings and
> > "theoretically" should be able to operate it without the pressure
> > Gage----if you so choose (but I would not). If you choose to operate
> > without the pressure gage, all you do is to disconnect the Air Pressure
> > Gage and connect the air brush nebulizer inlet directly in place of the
> > pressure gage. DO NOT CHANGE THE SETTING ON THE VALVE VENTING TO
> > ATMOSPHERE. If you choose to keep the Air Pressure Gage in the circuit,
> > obtain an "inline" Tee connection (compatible with the tubing
> > size...Aquarium department, Walmart....about .80) Cut the main air
> > supply hose going to the gang-valve and insert the "T" valve (one end of
> > tubing from Air Pump and the other section going to the gang-valve
> > INLET. Now, using a new section of tubing of desired length, connect
> > one end to the remaining outlet of the "T" valve and the other to the
> > Air Pressure Gage's Airbrush Adapter fitting. What you now have is the
> > Air Pressure Gage sensing the input pressure to the gang-valve
> > assembly....CONTINUALLY. One advantage to this set-up is that when you
> > trigger the Airbrush Nebulizer, you can monitor the pressure drop. If
> > the pressure drop falls below 20 psi when you trigger the
> > airbrush.....just recalibrate your system to a higher initial pressure.
> > I suggest 30 psi.
> > Actually, the system is very simple to construct
> > and I have endeavored to explain to the lowest common denominator of
> > technical expertise. My goal is for the "unknowing" non-technical
> > person to be able to assemble this little system.
> > If you do not understand my feeble explanations,
> > just email me and I will try to answer in a fashion acceptable to your
> > comprehension.
> > Our resident "tinkerer" has done quite well (I
> > believe) in composing this simple address to the challenge for a very
> > economical, somewhat portable, airbrush air-drive system.
> > Sinerely, Brooks
> > Bradley.
> >
> > --
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