worm-geared capstan

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Machine head — A machine head, also called a tuner, gear head, or tuning machine, is part of a string instrument ranging from guitars to double basses, a geared apparatus for tensioning and thereby tuning a string, usually located at the headstock. A headstock… … Wikipedia
Lathe (metal) — Center lathe with DRO and chuck guard. Size is 460 mm swing x 1000 mm between centers A metal lathe or metalworking lathe is a large class of lathes designed for precisely machining relatively hard materials. They were originally designed to… … Wikipedia

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