15 lines
931 B
Plaintext
15 lines
931 B
Plaintext
---
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name: "Cycloidal Gearbox"
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subtitle: "A fifteen-year-old's 1:9 gearbox, published with the version that didn't work"
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date: 2026-08-02
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shortlist: true
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link: "https://github.com/tom-ilan/cycloidal_gearbox"
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linkText: "GitHub"
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source: "Hacker News — Show HN"
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topics: [gadgets-and-toys, learning-and-reference]
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tags: [3d-printing, cad, open-source, engineering]
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description: "Three versions of a 3D-printed cycloidal drive — including the failed one — plus the Fusion 360 script that generates the tooth profile from scratch."
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---
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Version two is in the repo because it failed: a micro cycloidal drive squeezed to a NEMA 17's footprint, defeated by tolerances a 3D printer cannot hold. Version three works — 90mm across, ten outer pins, nine rotor lobes, 1:9. The real object here is the Fusion 360 script that draws the profile from pins, pitch radius and eccentricity, so you can generate a ratio the author never printed.
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