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A gear or cogwheel is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part to transmit torque. Geared devices can change the speed, torque, and direction of a power source. Gears almost always produce a change in torque, creating a mechanical advantage, through their gear ratio, and thus may be considered a simple machine. The teeth on the two meshing gears all have the same shape. Two or more meshing gears, working in a sequence, are called a gear train or a transmission. A gear can mesh with a linear toothed part, called a rack, thereby producing translation instead of rotation.
The gears in a transmission are analogous to the wheels in a crossed belt pulley system. An advantage of gears is that the teeth of a gear prevent slippage.
When two gears mesh, if one gear is bigger than the other, a mechanical advantage is produced, with the rotational speeds, and the torques, of the two gears differing in proportion to their diameters.
In transmissions with multiple gear ratios—such as bicycles, motorcycles, and cars—the term "gear" as in "first gear" refers to a gear ratio rather than an actual physical gear. The term describes similar devices, even when the gear ratio is continuous rather than discrete, or when the device does not actually contain gears, as in a continuously variable transmission.

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  1. 1775usmc

    As the weather changes

    As the weather changes from hot to cold do you change/alter your EDC or do you carry the same equipment year round? Different training practices, dryfire/livefire routines, clothing adjustments, firearm swaps, changing carry position, ect.? You are your first responder. Stay frosty friends.
  2. C

    New pack fabric to play with, what secondary color should I go with?

    Picked up 2 yards of this 500D fabric, the ebay seller photos showed a more green shade than what I got, so it isn't gonna be used for tactical gear.. but it's useful for a backpack that doesn't look tactical. Clockwise from top right; BP Green 500D Rockywoods 500D Ranger Green Ebay 500d...
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