Here are a few specifics on the spray etcher I am
building:
Chamber dimensions:
English 20.75" W X 20.25" L X 11.25" H
Metric 518.75mm W X 506.25mm L X 281.25mm H
PCB panel capacity (Max):
English 18.75" H X 18.25" L
Metric 468.75mm H X 456.25mm L
Number of nozzles : 6
Nozzle configuration : 2 X 3 matrix
Nozzle pressure : 2.2 bar
Nozzle spacing: 3" (75mm) Width between nozzles
3" (75mm) Height between nozzles
Nozzle to panel distance: English 9"
Metric 225mm
Etchant sump tank capacity: 5 Gallons (18.95 Liters)
Pump: Surflo 2088-722-444, 2.8 GPM (10.6 LPM)
45 PSI max before cutoff (3.1 bar)
13.7 VDC @ 7.0 Amp (Max)
Motor for sprayer rotation: Ford-Delco F150, 2002 Yr,
windshield
wiper motor (180 Degree
rotation) Pulled
from a totaled vehicle for
$20.00 (10 minutes to pull
and it was easy)
The following specs may (And probably will) change:
1.) Distance of nozzles to PCB
2.) Nozzle spacing
3.) Nozzle pressure
The pump and the WW motor are both running at 12 Vdc
which simplifies power distribution.
Total cost of materials (As of this post) : $117 USD
Total projected cost of materials : $168 USD
Best regards
Marvin Dickens
Alpharetta, Georgia USA
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