Ceramic dial cleaning

Working on an older Elgin 16s pocket watch, the ceramic dial has cracks, like most older pocket watches do. The cracks are filled with dirt and stand out pretty strongly. So I put it in my ultrasonic tank with Zenith watch cleaning solution, for 3 min, then ran it through a single rinse cycle. I’ve done this before, with pretty darn good results. Just thought I’d share.
Don’t try it with painted dials!
Before cleaning;

Image

After cleaning;[ATTACH…

Ceramic dial cleaning

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Silicon Micromachining

A work buddy and I were wondering how they make silicon hairsprings.

Segue to my desktop; I’m running tests and while they go, I’m reading “Horology” by Barry B. Kaplan, 2022, Shiffer Publishing Ltd., New York, and he outs it.

It’s a process called DRIE or Deep Reactive Ion Etching https://en.wikipedia.org/wiki/Deep_reactive-ion_etching where ions are accelerated in an ionized gas toward the subject and etch where not masked. Since they are accelerated toward the work by a…

Silicon Micromachining

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