MIL-HDBK-1110
Figure 13
Illustration of Proper Spray Patterns
(Note that the patterns are uniform throughout.)
Table 12
Common Conventional Air-Spray Problems and Their Causes
and Remedies
Description
Cause
Remedy
Thick center;
Atomizing air
Increase air pressure;
thin ends;
pressure too low;
decrease fluid
pinholes
too much fluid
pressure or use
to gun
smaller nozzle
Hourglass
Fluid pressure
Increase fluid
shape; dry
low; air
pressure; reduce
spray on ends
pressure too
air pressure; adjust
high; too wide
pattern control;
a spray pattern
reduce paint viscosity
Teardrop
Problem with gun
Remove and clean air
shape;
- nick in needle
nozzle; replace any
thicker at
seat; partially
bent parts or tighten
bottom
clogged orifice
air nozzle
or slightly bent
needle or loose
nozzle
"Boomerang"
Dried paint has
Dissolve dried paint
clogged one of
with thinner; do not
the side port
probe into nozzle
holes of the air
with metal devices
nozzle
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