Temper & Polish

March 21st, 2019

 

There are a number of parts that needed to be heat treated in order to function correctly in the clock. Pictured is a bath of molten salt used to hold the metal at 1500 degrees, after which it’s quenched in oil to hold it in a fully hardened state. The escapement is left fully-hard and goes through an arduous polishing process. Below there’s a picture of the dead-beat escapement being polished with a very fine polishing stone. After that (not pictured) the pallet-nibs are polished further with .05 micron polishing paste and polishing sticks.

The other parts are springs and are therefore heated in a separate kiln at 700 degrees to achieve a spring temper. To finish those off they’re nestled in a layer of brass powder and heated on a hotplate to create that nice blued finish.

The clock actually has a pulse now. I’ll post a small video of it ticking soon.

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