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Antique Tractor Paint and Bodywork

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hvw

12-03-2006 09:31:06

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After reading the post below, particularly the parts about HVLP guns I have a question. I set my wall regulator to say 40 psi, then the regulator on the gun to whatever the manual calls for. When I pull the trigger the gun guage goes to zero immediately. Is that normal or have I missed something as usual. I'm using a mid-level Devilbiss finish line 3.

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glennster

12-03-2006 13:17:15

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Re: Made me ask! in reply to hvw, 12-03-2006 09:31:06

having your wall regulator at 40psi will only deliver that pressure to the gun, your regulator at the gun will not be able to deliver any higher pressure than the main supply regulator. i use the two regulator setup at the shop because our compressors are running 175psi line pressures. i would rather drop the pressure in stages than go high right to the gun. makes the hoses last longer too. nothin more fun that bursting a hose during the final coat and having to start all over. the old murphys law gets me every time. nothing better than admiring your handywork after the last coat, slappin yourself on the back with what a good job ya did, and then having a june bug committ suicide on your paint job!

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Rod (NH)

12-03-2006 10:40:59

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Re: Made me ask! in reply to hvw, 12-03-2006 09:31:06

Hi,

Loose the regulator at the gun. Two regulators in series are not needed. Tee-in just a pressure gage at the gun inlet and adjust the pressure using your wall regulator with trigger pulled and the fan adjustment wide open. You don't need paint in the gun to do this. See how I do it here. Forget what the pressure at the wall regulator is. It will be higher than the gage at the gun but is no longer relevant to the issue of gun pressure. The difference between the two gages represent the pressure drop due to hose and fittings between them when the trigger is pulled. Always adjust pressure with the trigger pulled. Setting any pressure without the gun airflow is meaningless.

Rod

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CNKS

12-03-2006 10:31:09

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Re: Made me ask! in reply to hvw, 12-03-2006 09:31:06

It's a matter of opinion. Siphon feed, high or low line HVLP, still doesn't matter. As long as you have the correct psi at the gun it also doesn't matter, except for the reasons I listed below. The pressure at the gun is set with the trigger PULLED, with the gun EMPTY (mainly to avoid wasting paint). The pressure will not change, at least not significantly with paint in the gun. The pressure at the gun with the trigger closed is meaningless, as you just found out.

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DurangoCase

12-03-2006 09:52:39

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Re: Made me ask! in reply to hvw, 12-03-2006 09:31:06

Standing vs. spraying PSI.

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