The second mechanism - screw. Rozdyvlyayemos bolts and screws. Masha glad tells it when I was little, I thought that a metal ring, but when put on borozdochku finger and began to rotate, he shifted her finger along the screw - a little Masha thought it was witchcraft :)
Consider another mechanism with screw - a meat grinder. It is in the middle how to declutter of a piece - screw that pushes that must be milled to knives. Carefully screw rozdyvyvshys all together we arrive at the conclusion that it is also inclined plane, only this time it is wound on a core.
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