We’ve all seen the videos. Those crushers where the two cylinders with teeth roll towards one another and just obliterate everything.
How?
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Power/ torque, as already mentioned. But two more things: big tough bearings for the moving parts, and 2) tough and hard steel alloys. Manganese, chromium, and molybdenum steel alloys are common. They give good control of hardness (cutting capability), toughness (not brittle) and abrasion resistance.
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