Spray Gun Set-Up; Preparation - Husky HDS790 Instructions D'utilisation Et Manuel De Pièces

Introduction (continued)
regulations that may be in effect before
performing any spraying operations.
HVLP spraying is a growing trend
in the finishing industry due to
its environmental friendliness. By
definition, dynamic air pressures in the
air cap must be 10 psi or less to qualify
as HVLP. A soft, low velocity pattern is
produced which increases control and
reduces bounceback and overspray (See
Figure 1). For these reasons, HVLP is
also well suited for spraying parts with
recessed areas.
Conventional
HVLP
Figure 1

Spray Gun Set-up

The pressure for atomization is
controlled at the air source. The amount
of fluid is adjusted by the fluid control
knob, the paint viscosity and the air
pressure.
The gravity feed cup screws onto the top
of the gun body creating a positive fluid
pressure in the nozzle (See Figure 2).
Figure 2 - Gravity Feed cup Set-up

Preparation

1. Thoroughly mix and thin paint
in accordance with the paint
manufacturer's instructions. Most
materials will spray readily if thinned
properly.
2 Strain material through cheese cloth
or a paint strainer.
3. Fill the canister about 3/4 full and
start the air compressor.
4. Set up a piece of cardboard or other
scrap material to use as a target and
adjust for best spray pattern.
5. Test the consistency of the material
by making a few strokes on a
cardboard target. If material
still appears too thick, add a
small amount of thinner. THIN
WITH CARE!! Do not exceed
paint manufacturer's thinning
recommendations.
Fan DIRectIOn
The direction of the fan (horizontal or
vertical) can be changed by loosening
the lock ring and turning the air cap 90
degrees (See Figure 3). Hand tighten
lock ring after adjustment.
Lock Ring
Figure 3
Filtered,
Regulated Air
Source
Air Cap
Horizontal Fan
Vertical Fan
3
PatteRn aDjUStMent
1. Adjust air pressure to the spray gun
according to the recommendations
supplied with the spray material.
This air pressure usually falls
between 40 - 60 psi.
Do not exceed
spray gun
maximum pressure.
Adjust air pressure with the trigger
pulled and air control knob (if
applicable) fully open. If reduced air
pressure is desired for some areas of
the spray job, use the air compressor
regulator or air control knob to
reduce pressure as necessary (See
Figure 4).
Air Control
Knob
Increase
Air Flow
Figure 4 - air adjustment on Spray
Gun
2. Set pattern size to desired shape. For
full pattern, open pattern control
knob by turning counterclockwise.
For a round pattern, turn pattern
control knob clockwise (See Figure
5).
3. Turn fluid control knob fully
clockwise until closed (See Figure 5).
Pattern control knob
Fluid control knob
Figure 5 - Pattern Size
HDS790
Decrease
Air Flow