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By 1934, OTC was selling a variety of mechanic's tools to farmers and service stations. The tools were sold directly to the customer from makeshift display boards fitted into panel trucks or converted autos. When World War II broke out in 1939, the U.S. Army and Navy bought large quantities of OTC tools and by 1945, the company had doubled its ...
Red arrows indicate which way force is applied to the gear rack. The rack and pawl are both restricted to only linear movement (not shown). A ratchet (occasionally spelled rachet ) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction.
A transmission (also called a gearbox) is a mechanical device which uses a gear set—two or more gears working together—to change the speed, direction of rotation, or torque multiplication/reduction in a machine. [1] [2] Transmissions can have a single fixed-gear ratio, multiple distinct gear ratios, or continuously variable ratios. Variable ...
[[Category:Mechanics templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Mechanics templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
Self-centering three-jaw chuck and key with one jaw removed and inverted showing the teeth that engage in the scroll plate. The scroll plate is rotated within the chuck body by the key, the scroll engages the teeth on the underside of the jaws which moves the three jaws in unison, to tighten or release the workpiece.
A metal lathe is an example of a machine tool.. A machine tool is a machine for handling or machining metal or other rigid materials, usually by cutting, boring, grinding, shearing, or other forms of deformations.
The implementation of the involute tooth yielded a standard gear design that provides a constant speed ratio. Some important features of gears and gear trains are: The ratio of the pitch circles of mating gears defines the speed ratio and the mechanical advantage of the gear set. A planetary gear train provides high gear reduction in a compact ...
Unless the dog is engaged, the gear will simply freewheel on the shaft. This word usage is a metaphor derived from the idea of a dog (animal) biting and holding on, the "dog" name derived from the basic idea of how a dog jaw locks on, by the movement of the jaw, or by the presence of many teeth. In engineering the "dog" device has some special ...