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In construction, cylindrical or tapering piece of metal or plastic (or formerly wood) with a helical groove cut into it. Each turn of a screw moves it forward or backwards by a distance equal to the pitch (the spacing between neighbouring threads).
Its mechanical advantage equals 2 r/P, where P is the pitch and r is the radius of the thread. Thus the mechanical advantage of a tapering wood screw, for example, increases as it is rotated into the wood.
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
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