Why Screws Tighten Clockwise

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One of the six simple machines, a screw is nothing more than an inclined plane wrapped around a center pole. While today screws come in standard sizes, and typically are tightened by turning clockwise (and loosened by turning counterclockwise), this is a recent invention. A great example of how things that seem simple can be really hard to do right, the development of the predicable system we enjoy today took 2, 000 years to invent. Read more…

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Why Screws Tighten Clockwise

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