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5 mm Shaft Scotch Yoke Drive
A print-in-place scotch yoke that converts rotation of a 5 mm motor shaft (NEMA 17, 775, gearmotor) into 16 mm of straight-line reciprocating stroke — no linkages, no bearings to buy. The 68 x 62 x 21 mm frame bolts down through four M3 ears, the crank grips a 5 mm D-shaft, and the sliding yoke carries an M3 output rod hole for driving a pump, wiper, agitator or scraper.
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