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DIY Small Size Air Compressor on the CheapAuthor
Giorgos Lazaridis
August 17, 2012

PAGE 5 of 6 - New Compressor on the Block - Hacking a Refrigerator to use the Air Compressor

This air compressor from the small refrigerator is just perfect for the job!
Major Plan Changes - The Refrigerator to the Rescue
About a week ago I began cleaning a warehouse that will become my new lab. Inside i had 2 old and busted refrigerators which i used as storage boxes. I decided to throw them away but i removed first the two motors. Both motors worked perfectly fine - so i said, why not?

I do not know much about refrigerators and cooling cycle in general, but i still can understand how this thing works and how to wire the motor. Two wires goes to the mains, two to the thermostat contact. I only had to bridge the thermostat wires and the motors runs as soon as i plug it into the 220V.

The only problem was that the compressor output had this damn lame 5mm copper tube and i could only find 4 and 6mm connectors. So here is what i did to couple the motor with the pneumatics:

First I used some teflon tape to increase the outside diameter of the 5mm copper tube Some chemical pneumatic sealing will do the job! The 8mm hose now snugly fits into the copper tube Two fixing collars will definitely hold the hose in place and ensure an air-tight connection.

Connecting the Air Pressure Switch
Ok, its time to connect the pneumatic parts on the air chamber. The air pressure switch has 4 inputs from which i will utilize 3 of them, one for the air chamber, one as the compressor output and one for the safety pressure relief valve:

I will use a 1/4 male to male connector to connect the pressure switch with the tank This little red thing on the right side is the pressure relief valve It has the same 1/4BSP threads so it is connected directly onto the pressure valve

I will seal the third output. I will not use this one. Finally, an L quick-connect for 8mm hose is the final part.

The pressure switch with all the parts then goes to the output of the tank. Note that there is an 8mm quick-fix input on the other side of the tank. This is where the hose from the compressor goes...

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  • At 7 July 2014, 9:47:00 user daniel wrote:   [reply @ daniel]
    • I have published post about homemade airbrush compressor http://www.myairbrushcompressors.com/how-to-build-a-cheap-airbrush-compressor-using-refrigerator-parts/

  • At 29 January 2013, 6:51:41 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @Nikos i've got the system but i have not installed it yet.

  • At 28 January 2013, 13:39:37 user Nikos wrote:   [reply @ Nikos]
    • Has automatic system to turn on while you use it to refill or you turn on manually?

  • At 28 September 2012, 5:16:50 user Air Compressor wrote:   [reply @ Air Compressor]
    • I appreciate your interest to make equipment. Many companies give illustrated explanations about air compressors.

  • At 18 September 2012, 10:59:44 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @George Actually, i'm building my pneumatic solder paste dispenser. My next addition will be the smd pick-and-place, for which i already have the pump (USD4) and a manual dispenser (USD 2) which i will hack. Both the solder paste dispenser and the pick and place will be housed under the same box, will have the same foot pedal for operation, and will have a switch to choose which one i currently use.

  • At 18 September 2012, 6:12:25 user George wrote:   [reply @ George]
    • Het Kam, whilst you are building your smd 'picker', here's a cheap one you could use, looks like it's using a modified fish aquarium pump for the vacuum


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