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Old 02-05-2012, 10:10 AM
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HVLP/compressor help for beginner

I realize this forum is intended for those that spray autos (being much larger than what I will spray), but seems a good place for advice.

Anyways, considering getting a middle end hvlp gun to spay clear on furniture, but my compressor is a small, portable one with 4 cfm @ 40 psi, 6 gal tank.

With a regulator on the gun and the compressor turned up to 120 psi would I even come close to enough air to spray furniture? (Most of what I build/refinish would take 1 to 2 minutes at most to spray).

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Old 02-06-2012, 07:46 AM
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Quote:
Originally Posted by matt1248
I realize this forum is intended for those that spray autos (being much larger than what I will spray), but seems a good place for advice.

Anyways, considering getting a middle end hvlp gun to spay clear on furniture, but my compressor is a small, portable one with 4 cfm @ 40 psi, 6 gal tank.

With a regulator on the gun and the compressor turned up to 120 psi would I even come close to enough air to spray furniture? (Most of what I build/refinish would take 1 to 2 minutes at most to spray).
For your system to operate properly, your compressor should be able to supply at least 1 - 1.5x the pressure/CFM requirement of your gun.
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Old 02-06-2012, 06:37 PM
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I know that the ideal scenario would be to have plenty of air. But if it would be doable for something like a table or dresser (guess about equivalent to painting a hood) then it would be worth it (the gun) until I can afford to upgrade on the compressor.
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Old 02-20-2012, 09:49 PM
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I have an high pressure air compressor. What measures should I take for it's maintenance? Looking forward for your reply.
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Old 02-20-2012, 10:06 PM
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check the gun manufacturers specs on CFM requirement, then choose a compressor that will be large enough. I know most of the cheap hf hvlp guns I have used require 6-9 CFM at 90 PSI. your compressor would not spray those well at all.
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Old 02-20-2012, 10:57 PM
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Here, read this thread.
need suggestions for compressed air filtration / desiccant unit
I use two air tanks, and the setup I described works for me.
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Old 02-21-2012, 06:37 AM
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I may be wrong because never gave it much thought. HVLP stands for High Volume (at) Low Pressure. I considered this to mean high volume of paint delivered at low pressure. Just in case I am right, then you should be able to use your set up, especially since wood will handle a higher quantity of paint per pass with the gun than metal.

Trees
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Old 02-21-2012, 10:52 AM
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I believe it is a high volume of air.

I am not going to look of the exact formulas, but basically consider this.
If you have 10 cubic feet of air, at 90 PSI, allowing that amount of air to expand until you have 45 PSI, that amount of air will now take up around 20 cubic feet.
I am ignoring temperature changes, and I do not have the exact formula, and there is probably other errors because atmospheric air pressure is about 15 PSI.

But the point is that if you have a fairly small volume of high pressure air at a high pressure, you can get a larger volume of air at a lower pressure.



I use this spray gun. The manual that came with the spray gun says it requires about 9 SCFM at 40 PSI. The dual tank setup I described in the other thread allows me to run this gun, with a 3 HP compressor, and the compressor cycles on and off, typically with a longer off time than an on time.
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