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10-Speed Technic Gearbox

5 gears × 2 ranges = 10 speeds. Redoing the build guide with only my real parts.

  • Lego Engineering
  • Mechanisms
BuildingBUILD LOG #07

// What I'm building

A LEGO Technic gearbox with 10 speeds: 5 gears × 2 ranges (high and low).

It shifts with driving rings and shifting forks, plus a range selector that doubles the 5 gears into 10.

I wanted illustrated build instructions, so I asked ChatGPT to draw a guide. The picture is just a concept, not a tested build manual.

  • 10 speeds: 5 gears × 2 ranges
  • Driving rings + shifting forks
  • Guide: redo with my real parts
AI-drawn concept guide for a LEGO Technic 10-speed gearbox: a parts list and 11 illustrated steps. It uses parts I don't have yet.
Concept guide (AI-drawn, uses parts I don't have yet). Not my real build!

// Build Log

  1. Try #1 — the illustrated guide

    WHAT I TRIED
    Got an 11-step illustrated guide: frame, shafts, gear stack, driving rings, shifting forks, range rings, selector, motors, final assembly and testing.
    WHAT BROKE
    It uses parts I don't have! And it's only a concept: the gear spacing and shift links for all ten speeds weren't worked out.
    THE FIX
    Redo the guide using ONLY the parts I really have.

  2. Try #2 — the real-parts guide

    WHAT I TRIED
    Laying out all my real gearbox parts.
    WHAT BROKE
    Nothing yet — still sorting parts!
    THE FIX
    Take one photo of my parts so the guide can be rebuilt from just those.
NEXT STEP

Lay out all my real gearbox parts and take one photo, so the guide can be redone with only those parts.