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26 March, 09:11

Why does an electric knife have a nylon gear and a steel worm?

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  1. 26 March, 13:00
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    Gears are supposed to be softer than worms or pinions so they don't cause as much wear. Each tooth of a worm or pinion meshes with the teeth of the gear many more times in it's life than a tooth on the larger gear, two hard teeth meshing will wear more than a hard ans soft teeth. Having a steel gear would cause the worm to wear out too fast. Ideally the worm wheel should be phosphor bronze but bronze is expensive and plastic is cheap.
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