Crank (mechanism)
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A crank is an arm attached at a right angle to a rotating shaft by which circular motion is imparted to or received from the shaft. When combined with a connecting rod, it can be used to convert circu
Hand crank on a pencil sharpener
Tibetan operating a quern (1938). The upright handle of such rotary handmills, set at a distance from the centre of rotation, works as a crank.
Roman crank handle from Augusta Raurica, dated to the 2nd century AD
Vigevano's war carriage
Brace (tool)
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A brace is a hand tool used with a bit to drill holes, usually in wood. Pressure is applied to the top while the handle is rotated. If the bit's lead and cutting spurs are both in good working order,
Crank (mechanism)
…called a connecting rod (conrod). The term often refers to a human-powered crank which is used to manually turn an axle, as in a bicycle crankset or a brace and bit drill. In this case a person's arm or leg serves as the connecting rod, applying reciprocating force to the crank. There is usually a bar perpendicular…
A brace with various bits
A carpenter using a brace