High Flow Fittings?

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PostPosted: Sun Oct 17, 2021 5:50 pm
PainterDave wrote:
JCCLARK wrote:when you choke the gun down you change the air going through the gun from CFM to Pressure, (a nice smooth air flow vs air speeding though the tiny hole you choked down, basically the air don't act real well inside the spray gun) this will/could effect transfer efficiency and the biggest draw back is it does for a fact effect atomization.

you will create more air turbulence inside and outside the gun by choking it down.
O.K. then, I have been doing it wrong for years. I have the compressor at 75 psi and adjust at the gun for 28-32psi (depending which gun I am using). I never thought about the turbulence issue. I'm have to see how much I loose in the 25' hose. I have 2 small jobs this week so I will do it your way.

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PostPosted: Mon Oct 18, 2021 7:58 am
The gun never sees that pressure.
The regulator attached to the gun reduces it before it gets to the gun.
That is unless you have a really poor regulator.
JC.

(It's not custom painting-it's custom sanding)

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PostPosted: Mon Oct 18, 2021 9:47 am
Rebel Racing wrote:
PainterDave wrote:
JCCLARK wrote:when you choke the gun down you change the air going through the gun from CFM to Pressure, (a nice smooth air flow vs air speeding though the tiny hole you choked down, basically the air don't act real well inside the spray gun) this will/could effect transfer efficiency and the biggest draw back is it does for a fact effect atomization.

you will create more air turbulence inside and outside the gun by choking it down.
O.K. then, I have been doing it wrong for years. I have the compressor at 75 psi and adjust at the gun for 28-32psi (depending which gun I am using). I never thought about the turbulence issue. I'm have to see how much I loose in the 25' hose. I have 2 small jobs this week so I will do it your way.


I did not write that
JC.

(It's not custom painting-it's custom sanding)



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PostPosted: Mon Oct 18, 2021 10:35 am
'68 Coronet R/T wrote:With respect to Dennis, I disagree on the tank size not mattering.

As he accurately pointed out CFM ratings are the critical aspect, however if your tank is too small the compressor will run constantly. This creates heat which creates moisture and unless you have a refrigerated air drier you will end up with moisture in your lines.


The point I was trying to make is sound, dealing with air temp & moisture are another topic entirely. BUT go hand in hand with the subject of Air for painting.

No one is gonna put an 18 cfm pump and 5 hp motor on a 20 gallon tank, I would hope!
But if it was done as you said with a refrigerated cooler and a good water trap along with other filters it would work.

It would work Far better than using too small of a compressor pump and trying to run hi pressure in an attempt to overcome a lack of airflow.
Dennis B.
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.
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