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The rose engine, a specific subset of the family of ornamental lathes, is essentially a spirograph for metal. Here, a machinist carves a repeating offset pattern into a brass slug the size of a dime.

youtu.be/tXjrq4DWtIA

The superset of full ornamental lathes are essentially /three-dimensional/ spirographs. Here's an artisan using one as part of making an egg full of eyes (footnote 1).

youtu.be/AFJ0mE2R2S0

(1) I know my audience. n.n

@Momentrabbit Being sometimes a brass device myself, I can't help but find this fascinating. And more than a bit lewd. Nicely done.

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