Building a paint booth
m (→Air compressor) |
|||
| Line 6: | Line 6: | ||
==Air compressor== | ==Air compressor== | ||
{{cleanupsection}} | {{cleanupsection}} | ||
| − | HVLP guns need air. The 1/4" quick couplers do not flow air well. The 3/8" couplers flow twice the air. The problem with the smaller coupler is that you start out with higher pressure and since the couplers can not flow the air you get a drop | + | HVLP guns need air. The 1/4" quick couplers do not flow air well. The 3/8" couplers flow twice the air. The problem with the smaller coupler is that you start out with higher pressure and since the couplers can not flow the air, you get a drop in pressure. You have to change your rate of movement to compensate and that is not easy to figure out as a beginner. |
| − | I solved my compressor | + | I solved my compressor issues by using two 110V compressors. The first one's a 3hp, 10 gallon tank putting out 7.2 CFM @ 40 PSI and the second one's a 2hp, 10 gallon tank that puts out about 4 CFM @ 40 PSI. |
| − | I ran them on different circuits so they would not trip the | + | I ran them on different circuits so they would not trip the circuit breaker. |
| − | I ran a 20 foot hose from each air compressor | + | I ran a 20 foot hose from each air compressor, allowing the air to cool and water to condensate out. They flow into a Y connector at my high volume water trap http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=98904. The output of the water trap has an air regulator and 50 feet of hose that goes into the paint booth. |
| − | I never ran out of air with my gun | + | I never ran out of air with my gun that requires 9.5 cfm @ 29psi. On long spray sessions I could hear the smaller compressor turn on to keep up with 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. |
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. | 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. | ||
| − | + | Motor hp has been incorrectly stated in the past. A 5 HP rated compressor sometimes used a lower HP motor rigged to pull more torque at start. This was often connected to a lower quality pump and run at high speed to produce higher CFM. These units seem to make more noise than air. | |
| − | + | ||
| + | The true HP rating of a motor may be revealed by its current draw. A real 5 HP motor pulls about 22 amps while the 7.5 HP motor will draw 32. Keep in mind the current these motors draw will cost you in electricity. I would avoid 7.5 HP units if that level of volume is rarely needed. The higher current draw will run up your electric bill if you use it moderately to run power tools. | ||
An example: | An example: | ||
| − | At a shop where the compressor was used daily, a quality Ingersoll | + | At a shop where the compressor was used daily, a quality Ingersoll Rand 7.5 HP compressor eventually burned out its bearings. For this unit IR used the same pump as with the 5 HP version. With the 7.5 they got the increase in volume by using a larger pulley and ran the pump at a higher RPM. It also needed its belts changed every couple of months. In addition, this unit needed its magnetic stater replaced several times due to the levels of current required to start the motor. |
==Ventilation== | ==Ventilation== | ||
Your Privacy Choices