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Machine head
Apparatus for tuning stringed musical instruments / From Wikipedia, the free encyclopedia
This article is about the musical instrument tuning device. For the metal band, see Machine Head (band). For other uses, see Machine head (disambiguation).
A machine head (also referred to as a tuning machine, tuner, or gear head) is a geared apparatus for tuning stringed musical instruments by adjusting string tension. Machine heads are used on mandolins, guitars, double basses and others, and are usually located on the instrument's headstock. Other names for guitar tuners include pegs, gears, machines, cranks, knobs, tensioners and tighteners.
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Non-geared tuning devices as used on violins, violas, cellos, lutes, older Flamenco guitars and ukuleles are known as friction pegs, which hold the string to tension by way of friction caused by their tapered shape and by the string pull created by the tight string.