That's a good article on the basics. I have several compressors. All used for domestic shop use.
I run a small blast cabinet, spray gun, various air tools, air up tires, etc. All run satisfactorily for my needs. I'm not a big user of air so I couldn't justify buying a bigger compressor.
Two of these compressors started out as 2 hp/20 gallon Sears compressors sold new in the mid 70's. They had a set of wheels and a push handle mounted to the tank.
There is a guy here that salvages store return air compressors that sells tanks. I bought two tanks for $50 each and mounted the motor, compressor and other hardware on these two vertical tanks. At the same time, I adjusted the "on" switch to 85 lbs and the "off" switch to 115 lbs. for the same reasons your author gave.
It turns out I now have plenty of air for most of my uses even though for continuous use, they obviously still won't keep up.
The point he made about X number of amps times X number of volts equals X amount of horsepower is a good tip regardless of what the sticker might say in the advertisement.
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