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Antique Tractor Paint and Bodywork |
Re: Pressure at gauge at the wall
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Posted by Frank Stalfire on September 30, 2004 at 20:51:15 from (12.65.24.233):
In Reply to: Pressure at gauge at the wall posted by Ray A on September 30, 2004 at 18:21:39:
Hi Ray
Unfortunatly that answer is subjective to a number of variable, compressor output, airline inside diameter ( HVLP needs 3/8 ) length of air hose, size of air fittings ( again 3/8 is recommended ). The short story is, HVLP work on volume of air supplied not presure, so all the fittings and hose need to be large, 3/8, HVLP guns are only HVLP when air cap pressure not line pressure is below 10PSI, you will spray base coat aroung 5-6 PSI and clear at 7-10, you can use the gun above 10psi but it is no longer an HVLP compliant gun at that pressure. You really need a special air cap that has a pressure gauge on it ( called a test cap ) to know where to set the wall gauge to acheive the desired cap pressure. I can tell you this, in my travels training painters in body shops and helping dial in there guns you will probably be between 30-50 at the gauge on the gun, that is a big spread but it is as narrow as I can get, the SATA NR 2000 is about 35 ans the SATA NR 95 is around 50, the Devilbiss GTI is around 45, don't forget you can use the gun at any pressure but you will only get the advantages of HVLP below 10 PSI at the cap, also a myth about HVLP guns is that they give off very little overspray, the truth is when you dial in your gun to spray the smoothest and give the best finish you are usually at the top of that 10psi and get almost as much overspray as a conventional gun, certainly you can use it at lower airpressure but it will give you a noticably amount of orange peel and mettalic basecoats will very difficult to blend. hope that helps.
Frank
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