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Old 03-02-2006, 09:13 AM
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Air Pressure

I did a air pressure test for my gun and thought you guys might
find it helpful.
I checked my pressure with my Astro HVLP that needs 40# at the gun.
I used 1/2" hose with larger 3/8" fittings.

With the regulator on the gun and opened up completely I had to set
the compressor regulator to 65 psi to get 40 at the gun. (25 psi drop)

With no regulator, and only a gage at the gun I had to set the
compressor regulator at only 45 psi. (5 psi drop)

The regulator was suppose to be for HVLP and be high-flow, but it
obviously restricts air flow. I now install the gage fitting, adjust for pressure
and remove the gage for spraying, it's much more comfortable and I don't
have to crank the air up at the compressor any more.

This may not work for high CFM guns, mine is 10 cfm at 40 psi.
I can set the tank to 45 psi and get what I need (without a regulator)
If you have to crank up the pressure a lot to get the gun right,
you may want to check out your regulator at the gun.
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Old 03-02-2006, 11:19 AM
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Yup JC. Not ALL regulators are alike.
I was having some pressure issues myself and decided to "open one up" and SEE what's inside. I was amazed at the tiny opening under the diaphram for air to pass thru. No wonder I was having trouble.
Actually, those $9.00 one's at Harbor for HVLP guns seem to work fine. I have a couple I use and they provide plenty of air for my HVLP gun's.

Isn't it kind of a "drag" using a 1/2" hose?

A true 3/8 should be plenty.
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Old 03-03-2006, 05:01 AM
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Actually I also tested with 1/2" and 3/8" hoses for my gun and
found no differences, since I installed the larger fittings.
I now use the 3/8" for painting.
But for the pressure comparisons I did I used the 1/2" to be sure.
I think that the cfm requirements will dictate how much you can
get away with when it comes to hose and fitting sizes.
My gun at 10 cfm isn't bad but Bondoking has a 16 cfm gun.
I think I would use the 1/2" with that.
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Old 03-03-2006, 05:47 AM
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i ordered the cap gauge for my iwata's. i have'nt found a small reg that is accurate enough for 10 lbs.
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Old 03-03-2006, 08:28 AM
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You don't set the pressure "at the gun" at 10 lbs anyway. Your "at the gun" and "at the cap" are two TOTALLY different things. There is no way you could set your gun a 10 lbs "at the gun" that would be no where near the pressure needed to atomize. If you did, you would probably have about three or four at the cap and the paint would come out in huge droplets. If you use the cap pressure guage, that will solve any problems, that is for sure though.

Brian
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Old 03-03-2006, 12:01 PM
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at the gun is 16 to 18 lbs . at the wall will be around 30 with a the binks gage. 8 to 10 at the cap depending on what i'm shooting.
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