Exposing, Developing, Etching and Drilling PCBs – My (Current) Way
Robert's Smorgasbord Robert's Smorgasbord
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 Published On Aug 16, 2020

Me making a printed circuit board: There’s room for improvement …
↓↓↓ Complete description, time index and links below ↓↓↓

Note that this is not a tutorial. It’s just a video showing my current process of making single layer PCBs. If it entertains you – good. If you learn something – even better. If you have suggestions for improvements – the best possible outcome (for me)!

Anyway, the video covers everything from the finished PCB design to a PCB ready for soldering. In real time it took me a little less than two hours (including a minor hiccup). For your convenience I’ve condensed it down to 42 minutes.

►Intro
00:00 Intro – how to get from raw PCB material and a design to a PCB ready for soldering
►Exposure Mask
00:31 Printing – two copies on a laser printer (non-mirrored, toner will touch PCB)
01:00 Spraying – the copies with density spray to improve – well – density
01:24 Cutting – the two copies to size, one a little smaller than the other
02:12 Aligning – the two copies on top of each other
►PCB Raw Material
03:31 Cutting – on the table saw with a diamond coated blade
►Expose & Develop
06:09 Aligning – exposure mask and PCB material
07:38 Exposing – the PCB material in my UV exposure unit
09:00 Mixing – the developer solution from sodium hydroxide (caustic soda, lye)
11:15 Developing (i) – failed, photoresist didn’t come off as planned
16:15 Developing (ii) – succeed, well it was good enough
►Etch
21:18 Mixing – the etching solution from sodium persulfate
23:01 Etching – the exposed and developed PCB material
►Expose & Develop Again
27:59 Exposing & developing – a second time to get the photo resist off
►Intermediate Result
30:55 Inspecting – the etched PCB
32:02 Reviewing – the PCB from the failed exposure & development
►Drill & Mill
33:16 Plan – for drilling and routing the PCB
33:56 0.8mm holes – drilled with diamond coated drill bit
34:38 1.0mm holes – drilled with diamond coated drill bit
34:53 1.2mm holes – drilled with diamond coated drill bit
35:01 1.5mm holes –drilled with diamond coated drill bit
35:26 1.2mm slots – drilled and milled with diamond coated drill bit
37:03 1.0mm slots – drilled and milled with diamond coated drill bit
37:39 Freehand 1.2 mm slot –because I forgot it in the PCB design
38:38 3.0mm holes – drilled with regular HSS drill bit
38:51 Unmarked 2.5mm holes – drilled using a paper template
►Coat
40:27 Spraying – the PCB with some flux/protection coating
►Wrap-Up
41:24 Inspecting – the finished PCB
42:00 Wrap-up – from design to PCB in under 2 hours

UV Exposure Unit Build    • UV Exposure Unit Build  

#robertssmorgasbord #diy #pcb #circuitboard #printedcircuitboard #board #etching #developing #drill #coating

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