2024-01-08 (M) AugLim RADARBadge Etching first stator

I poured ferric chloride acid into a plastic container, submerged the treated copper plate, and gently swirled it for 40 minutes. It would have taken less time, but I used minimal acid. One issue I noticed was that the center accumulated clouds of dissolved copper while the edges got the cleaner solution. A larger self-agitating vat could be worth the time.
Ferric acid bath

The results were disappointing. I saw flecks of undissolved copper, which created shorts in some places, and some gaps ran in streaks. I suspect the issues were entirely my fault. I transported the board in a bag containing oil traces, and I probably scratched the etch-resist away to create those fractures.
Flecks and breaks

According to the videos I watched, a complete coil should read 20 Ohms. For that kind of reading, I would measure across at least two layers of spirals, and since I was measuring one, I hoped for ten Ohms. Unfortunately, I saw approximately 1 Ohm, so the design is flawed, the measurement is wrong, my traces are too thick, or some other problem.
Disappointing resistance reading

The rest of the posts for this project have been arranged by date.
First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10

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