Adapting an Airless Pump for Use with an AAA Gun
From contributor E:
I did this for a while using a Binks AA-4000 gun with a Graco Nova SP pump. I added a fluid pressure gauge at the pump output to read the pressure. Worked fantastically well for painting walls and ceilings. For woodwork, it worked okay, but the pump has a much smaller displacement than a real AAA pump (since it is electrically driven by a DC motor, and therefore uses frequent short strokes). This results in pulsation at the low pressures (400-600 psi) typical of AAA spraying. Using a 0.011" tip with waterborne lacquers, the pump would cycle every few seconds. There would be a pressure burst with each cycle, which I blamed for some of the sags I was getting. I switched to an air-driven AAA pump (16:1), and it has a much larger piston and stroke, so it only cycles every few minutes. It is also dual-action, which means it pumps both on the up-stroke and down-stroke. However, you can use the electric airless pump with good success if sags and unevenness are not a problem, and you don't want to go to very low pressures. I would say 600 psi was about the lowest I could reliably use it. This Graco pump was an older professional model with electronic pressure control. I paid about the same for each pump used.
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