# crank

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## crank,

mechanical linkage consisting of a bar attached to a pivot at one of its ends in such a way that it is capable of rotating through a complete circle about the pivot. One of the principal uses of a crank is to turn reciprocating, or back and forth, motion into rotary motion or vice versa. A bell crank is one designed to change the direction of a linear motion.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Crank

the simplest rotating part of a crank mechanism. It has a cylindrical projection, the pin, whose axis is displaced relative to the axis of rotation of the crank by a distance r, which may be fixed or variable (see Figure 1).

Figure 1. Types of crank: (a) with constant radius r of pin displacement, (b) with r regulated by a slide, (c) with r regulated by a rotating disk

## crank

[kraŋk]
(mechanical engineering)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## Crank

In a mechanical linkage or mechanism, a link that can turn about a center of rotation. The crank's center of rotation is in the pivot, usually the axis of a crankshaft, that connects the crank to an adjacent link. A crank is arranged for complete rotation (360°) about its center; however, it may only oscillate or have intermittent motion. A bell crank is frequently used to change direction of motion in a linkage (see illustration). See Linkage (mechanism)

Cranks (a) for changing radius of rotation, and (b) for changing direction of translation
McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.

## crank

In a mechanical linkage or mechanism, a link that can turn about a center of rotation. The crank's center of rotation is in the pivot, usually the axis of the crankshaft, that connects the crank to the adjacent link. A crank is arranged for complete rotation (i.e., through 360°) about its center; however, it may only oscillate or have intermittent motion. A bell crank is frequently used to change the direction of the motion in a linkage.

## crank

1
1. a device for communicating motion or for converting reciprocating motion into rotary motion or vice versa. It consists of an arm projecting from a shaft, often with a second member attached to it parallel to the shaft
2. a handle incorporating a crank, used to start an engine or motor

## crank

2, cranky
(of a sailing vessel) easily keeled over by the wind; tender
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

## crank

(Automotive slang) Verb used to describe the performance of a machine, especially sustained performance. "This box cranks (or, cranks at) about 6 megaflops, with a burst mode of twice that on vectorised operations."
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Throughout, Kirstein remains patrician, cranky, and intoxicatingly judgmental.
He says it is "cranky" to nurture decay, but gentrification serves parasitic developers; and preservation, because it is selective, falsifies history.
His focus though is on the human details--the cranky candidate, the mess-ups with volunteers, the awkward meet-and-greets, the sheer exhausting grind.
Challenging America to live up to the mission of its founders, to honor the potential of each citizen and to offer equal protection and opportunity to all is apparently enough to get you placed on the 10 Most Wanted List of over-paid well-fed cranky kooks.
with their equally adorable cranky, whiny, loud, crying two-year-old girl.

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