DIY Air Compressor Made From Refrigerator and Fire Extinguisher

[Giorgos] wanted to build a pneumatic solder paste application tool but needed an air compressor to power it. Instead of going out and buying a compressor, he decided to build one himself. It sure is an ugly duckling but we’re impressed with it’s performance.

The air tank is an old spent fire extinguisher. The stock valve was removed and the insides were cleaned out. Out of curiosity, [Giorgos] figured out the volume by filling the tank with water, then measuring how much water came out. It turned out to be 2.8 liters. Two holes were drilled and threaded bungs were welded on to attach inlet and outlet lines.

The compressor portion is straight out of a refrigerator. Besides the compressor being free, the other benefit is that it is super quiet! Check the video after the break, you’ll be astonished. [Giorgos] did some calculations and figured out that his solder paste applicator needed about 8 bar (116 psi) of pressure. The refrigerator compressor easily handles that, filling the tank in 1 minute, 25 seconds.

On the output side of the tank resides a pressure switch for automatically filling the tank and a regulator for ensuring the solder paste applicator gets the required pressure. This isn’t the first time we’ve seen a refrigerator compressor used as an air compressor. Check out this dual setup capable of 400 psi.

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Going Mobile with your Air Tools


If you’ve ever worked with air tools outside of a shop setting, you know that lugging the air hose around can get more and more annoying the further away you are from the compressor. [headsplosive] posted a video (embedded after the break) showing how to go mobile with your air tools.

Air tanks made for paintball are high-pressure in a tiny space, and make a very convenient energy source. In this case, [headsplosive] used a 68 cubic inch, carbon fiber wrapped tank rated at 4500psi. The normal regulator only steps that pressure down to 800psi, so he added a second regulator to hit the 120-140psi that air tools need. He then attached a ‘remote line’, or a coiled high-pressure hose, and added a standard air tool coupler at the end.

The yield is pretty impressive. With a half-charge of the tank, he managed to drive 100 two-inch nails. [headsplosive] has a scuba tank handy, and uses that to recharge the paintball tank. He estimates a scuba tank will last you about 2000 shots from a nailer, and only costs about $7.50 to recharge. Not bad at all. We can’t help but wonder how long you’d get out of an air-powered cutoff wheel, or even a hammer drill. While the parts aren’t terribly cheap unless you buy them used, it will still pay for itself in convenience if you have the need.

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