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Scott-Russell straight-line kit

Parametric Scott-Russell exact straight-line linkage kit: a coupler bar (twice the crank, with a mid pivot), a crank equal to the half-coupler, and a slotted guide rail. Pin the crank to ground and the coupler midpoint to the crank, slide the bar end in the rail slot — the far end traces an EXACT straight line. Set one base crank unit to scale the whole mechanism, plus link width, thickness and bore.

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