Homebrew PCBs

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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