Woodworker's Journal 2001-25-1, страница 63

Cup and Fluid Tip Options

Two important factors to consider in your choice of gun are the cup configuration and the range of fluid tips thai are available.

Cups come in three different configurations. With a gravity feed cup, the finish flows down into flie air path, thanks to gravity. That means all the air in the gun is used for atomizing the finish, not moving it out of the cup. This format is the easiest to clean and my personal favorite.

In a siphon feed, air moving across the mouth of a small tube creates a vacuum, to siphon fluid up from the cup. Most HYLF' guns do not have sufficient air pressure to power a siphon cup. bul they are common on standard guns.

Finally, there's the pressure feed. Some of the moving air is diverted into a sealed cup, creating enough pressure lo force the fluid

With the adjustments wide open, the spray pattern should be oval and uniform (far right). It it is wetter on one side, pear-shaped, or bone-shaped (left to right), the fluid tip needs to be cleaned.

up the tube to the nozzle. It takes only three or four pounds of pressure to move the finish.

The fluid tip is important because different types of finish work best with different sizes of tips. Lacquer and paint will spray nicely through a large 0.070" (1.75 mm) tip, but I find many waterbased finishes and thin varnishes work better through a smaller .040" (1 nun) or .055" (1.3 mm) tip. Better manufacturers offer a range of Quid tip. needle and air cap sizes lo make the gun more versatile. If you plan to spray acid catalyzed lacquer, conversion varnish, or waterbased coatings.

make sure all the fluid passages, including the tip and nozzle, are stainless steel. Regular steel will rust. This is standard fare on high quality guns.

Each type of gun has its strengths and weaknesses, and which is right for you depends on your needs and how you plan to use it. No matter what you choose, there is no guarantee that high prices mean good quality — but for the most part, you get what you pay for. A good gun, even though it costs more up front, will be well worth it.

continues on page 64 .

(Cirde No 53 on PRODUCT INFORMATION form)

Woodworker's Journal February 2001

63

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