My $250 air compressor

sungoesdown

Member
Joined
Jul 21, 2008
Location
florence, sc
Since we don't have a shop tech area, I put this here. If it is in the wrong area, let me know so we can get it moved.

I finally have my shop air compressor done. It has a true 6 HP motor, a small used pump, and a tank that is about an 80-100 gallon. As an air compressor tech, I was able to scrounge most of these parts up. I have about $250 in this mainly being the motor from HF.

I ran a starter to the motor so I would not have that much amperage going through the pressure switch. The pump on it is small but I will be able to upgrade down the road when needed with one from Harbor Freight. I geared the sheave down on the motor so it wouldn't pull a lot of amps. The motor is rated at 26 FLA(full loaded amps) but at pressure, it is only pulling about 10 amps. I have it set to come on at 150 psi and cut off at 165. The pressure switch has an unloader valve for the head pressure which when combined with an in-tank check valve will unload all of the built up head pressure so when it cranks back up there will be no head pressure.
I built an enclosure that just sits in place. It cuts down on the noise a lot, but there is still enough ventilation so over-heating is not a problem.


To engage the starter, I have a common household light switch wired inline with the pressure switch. The light switch has to be on and the pressure switch closed for the starter to pop in.
The setup-
ai166.photobucket.com_albums_u88_momentumauto_5dff7232.jpg

The starter and switches- Thats black paint behind the starter, not burn marks
ai166.photobucket.com_albums_u88_momentumauto_399a5947.jpg

Enclosed-
ai166.photobucket.com_albums_u88_momentumauto_928eddce.jpg


I tried to install everything over to one side on the tank so I can put a small table top media blaster right next to the compressor.
 
Ventilation? Is that a biggie? I had plans of enclosing mine in just to keep the weather off. Or should I leave it open?
 
Ventilation can up the oil temps just like in a car. I have a mechanical temp probe with guage that I am going to put in place of the drain plug next time I change the oil. this will help me monitor things closely.

It can also cause the compressed air temps to go up which will get you more water in the air stream.

If you have proper tank drainage and some sort of filter, that part will be ok. I plan on adding an auto drain valve to the bottom of the tank which will drain the water however long I want whenever I want.
 
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