Building a paint booth
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I never ran out of air with my gun which needs 9.5 cfm @ 29psi. On long shoots I could hear the smaller air compressor turn on to keep up with the air demand but it normally only ran the larger compressor. The beauty of this is you do not have to deal with supplying a 220V circuit for a larger system. | I never ran out of air with my gun which needs 9.5 cfm @ 29psi. On long shoots I could hear the smaller air compressor turn on to keep up with the air demand but it normally only ran the larger compressor. The beauty of this is you do not have to deal with supplying a 220V circuit for a larger system. | ||
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| + | When buying a compressor ask yourself how long you are going to be in the hobby. The low cost high HP compressors make air by using a smaller compressor run at high rpm. This beats the pump to death. These compressors will work for the guy who is dabbling some in the garage, but will fall apart if used regularly. | ||
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| + | Compressor motor hp has been incorrectly stated in the past. They would put 5 HP special ratings. This was a lower HP motor rigged to pull more torque at start. These was connected to a lower quality pump and run at high speed to make CFM, they seem to make more noise than air. | ||
| + | You can tell the true HP rating of the motor by its current draw. A real 5 HP motor draws about 22 amps and the 7.5 HP motor will draw 32 amps. Keep in mind the current these motors draw will cost you a lot in electricity. I would not get a 7.5 HP unit if you rarely ever need the volume. The higher current draw will up your electric bill if you use it moderately just to do power tools. | ||
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| + | An example: | ||
| + | At a shop where the compressor was used daily, a quality Ingersoll rand 7.5 HP compressor eventually burned out the bearings. For this unit they use the same pump as used with the 5 HP compressor. For the 7.5 they got the increase in volume by putting a larger pulley on the motor and ran the pump at a higher RPM. It did not like this higher speed. It also needed to have its belts changed every couple of months. Also this unit needed its magnetic stater replaced several times because it was border line on the amount of current needed to start the motor. | ||
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