Apps / Brocot Gear Finder

Brocot Gear Finder

Gear trains for any ratio with continued fractions and the Stern-Brocot tree.

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What it does

Finds gear trains that hit a ratio you need. You enter the target as a number, a fraction or a formula, set the range of tooth counts, and it searches every combination of up to three gear pairs, keeping the best for each number of stages. A clockmaker chasing sidereal time can get within about a millisecond a day. You see the gears turning together, a dial showing how far the result drifts over time, and the math behind the choice, then export a cut sheet for a laser cutter.

Good to know

The layout is a diagram with no clearance or tooth-shape checks, and trains stop at three stages.

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