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Jacking Gear
A JACKING GEAR (also known as a turning gear) is a device placed on the main shaft of an engine or the rotor of a turbine. The jacking gear rotates the shaft or rotor and associated machinery (such as reduction gears and main turbines ), to ensure uniform cool-down. Without turning, hogging or sagging can occur. Additionally, the jacking gear's assistance in rotation can be used when inspecting the shaft, reduction gears, bearings, and turbines. As an auxiliary function, the jacking gear also helps to maintain a protective oil membrane at all shaft journal bearings . Hogging is when the shaft bows upwards due to thermal stratification. On the engine shaft of a marine vessel , this process also prevents the shaft from warping when a ship is preparing to achieve maneuvering status. MOTOR AND DRIVETRAINThe jacking gear motor is designed to rotate the shaft at approximately 1/10rpm. Most jacking gear motors are rated at 5hp
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Clutch
A CLUTCH is a mechanical device which engages and disengages power transmission especially from driving shaft to driven shaft. In the simplest application, clutches connect and disconnect two rotating shafts (drive shafts or line shafts ). In these devices, one shaft is typically attached to an engine or other power unit (the driving member) while the other shaft (the driven member) provides output power for work. While typically the motions involved are rotary, linear clutches are also possible. In a torque-controlled drill , for instance, one shaft is driven by a motor and the other drives a drill chuck
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Pinion
A PINION is a round gear used in several applications: * usually the smaller gear in a gear drive train , although in the first commercially successful steam locomotive (the Salamanca ), the pinion was rather large. In many cases, such as remote controlled toys , the pinion is also the drive gear. * the smaller gear that drives in a 90-degree angle towards a crown gear in a differential drive . * the small front sprocket on a chain driven motorcycle. * the round gear that engages and drives a rack in a rack and pinion mechanism and against a rack in a rack railway . * in the case of radio-controlled cars with an engine (i.e. nitro ) this pinion gear can be referred to as a CLUTCH BELL when it is paired with a centrifugal clutch . SEE ALSO * List of gear nomenclature REFERENCES * ^ Gear Nomenclature, Definition of Terms with Symbols. American Gear Manufacturers Association . p. 72. ISBN 1-55589-846-7 . OCLC 65562739 . ANSI/AGMA 1012-G05. * ^ Eric Perez
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Special
SPECIAL or SPECIALS may refer to: CONTENTS * 1 Music * 2 Film and television * 3 Other uses * 4 See also MUSIC * Special (album) , a 1992 album by Vesta Williams * "Special" (Garbage song) , 1998 * "Special" (Mew song) , 2005 * "Special" (Stephen Lynch song) , 2000 * The Specials
The Specials
, a British band * "Special", a song by Violent Femmes on The Blind Leading the Naked * "Special", a song on
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Reduction Gear
A GEAR TRAIN is a mechanical system formed by mounting gears on a frame so the teeth of the gears engage. Gear
Gear
teeth are designed to ensure the pitch circles of engaging gears roll on each other without slipping, providing a smooth transmission of rotation from one gear to the next. The transmission of rotation between contacting toothed wheels can be traced back to the Antikythera mechanism
Antikythera mechanism
of Greece and the south-pointing chariot of China. Illustrations by the Renaissance scientist Georgius Agricola
Georgius Agricola
show gear trains with cylindrical teeth. The implementation of the involute tooth yielded a standard gear design that provides a constant speed ratio
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Electric Motor
An ELECTRIC MOTOR is an electrical machine that converts electrical energy into mechanical energy . The reverse of this is the conversion of mechanical energy into electrical energy and is done by an electric generator , and generators and motors have much in common. Most electric motors operate through the interaction between an electric motor's magnetic field and winding currents to generate force. In certain applications, such as in regenerative braking with traction motors in the transportation industry, electric motors can also be used in reverse as generators to convert mechanical energy into electric power. Found in applications as diverse as industrial fans, blowers and pumps, machine tools, household appliances, power tools, and disk drives, electric motors can be powered by direct current (DC) sources, such as from batteries, motor vehicles or rectifiers, or by alternating current (AC) sources, such as from the power grid, inverters or generators
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Steam Turbine
A STEAM TURBINE is a device that extracts thermal energy from pressurized steam and uses it to do mechanical work on a rotating output shaft. Its modern manifestation was invented by Sir Charles Parsons in 1884. Because the turbine generates rotary motion , it is particularly suited to be used to drive an electrical generator – about 90% of all electricity generation in the United States (1996) is by use of steam turbines. The steam turbine is a form of heat engine that derives much of its improvement in thermodynamic efficiency from the use of multiple stages in the expansion of the steam, which results in a closer approach to the ideal reversible expansion process
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Marine Vessel
WATERCRAFT are water-borne vehicles including ships , boats , hovercraft and submarines . Watercraft
Watercraft
usually have propulsive capability (whether by sail, oar or engine) and hence are distinct from a simple device that merely floats , such as a log raft . CONTENTS * 1 Types * 2 Usage * 3 Design * 4 Propulsion
Propulsion
* 5 Construction * 6 Registration * 7 Navigation * 8 Weapons * 9 See also * 10 References * 11 External links TYPESMost watercraft would be described as either a ship or a boat . However, there are numerous craft which many people would consider neither a ship nor a boat, such as: surfboards (when used as a paddle board), underwater robots , seaplanes , jetskis and torpedoes . Although ships are typically larger than boats, the distinction between those two categories is not one of size per se
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Oil
An OIL is any neutral, nonpolar chemical substance that is a viscous liquid at ambient temperatures and is both hydrophobic (immiscible with water , literally "water fearing") and lipophilic (miscible with other oils, literally "fat loving"). Oils have a high carbon and hydrogen content and are usually flammable and surface active . The general definition of oil includes classes of chemical compounds that may be otherwise unrelated in structure, properties, and uses. Oils may be animal , vegetable , or petrochemical in origin, and may be volatile or non-volatile. They are used for food (e.g., olive oil ), fuel (e.g., heating oil ), medical purposes (e.g., mineral oil ), lubrication (e.g. motor oil ), and the manufacture of many types of paints, plastics, and other materials. Specially prepared oils are used in some religious ceremonies and rituals as purifying agents
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Journal Bearing
A PLAIN BEARING (in railroading sometimes called a solid bearing) is the simplest type of bearing , comprising just a bearing surface and no rolling elements. Therefore, the journal (i.e., the part of the shaft in contact with the bearing) slides over the bearing surface. The simplest example of a plain bearing is a shaft rotating in a hole. A simple linear bearing can be a pair of flat surfaces designed to allow motion; e.g., a drawer and the slides it rests on or the ways on the bed of a lathe . Plain bearings, in general, are the least expensive type of bearing. They are also compact and lightweight, and they have a high load-carrying capacity
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Barring Engine
A BARRING ENGINE is a small engine, usually a steam engine, that forms part of the installation of a large stationary steam engine . It is used to turn the main engine to a favourable position from which it can be started. If the main engine has stopped close to its dead centre it is unable to restart itself. Barring may also be done to turn the engine over slowly (unloaded) for maintenance, or to prevent belt drives being left too long in one position and taking a "set". CONTENTS * 1 Development * 2 Preservation today * 3 See also * 4 References * 5 External links DEVELOPMENTThe first barring engines or barring gear were manual. At their simplest, they were a hefty engineer with a crowbar (hence the term "barring"). The engine's flywheel could be provided with a series of holes or teeth and a roller fulcrum set into the frame at a convenient place. Later manual barring engines had geared drives and a crank handle
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Jacking Gear
A JACKING GEAR (also known as a turning gear) is a device placed on the main shaft of an engine or the rotor of a turbine. The jacking gear rotates the shaft or rotor and associated machinery (such as reduction gears and main turbines ), to ensure uniform cool-down. Without turning, hogging or sagging can occur. Additionally, the jacking gear's assistance in rotation can be used when inspecting the shaft, reduction gears, bearings, and turbines. As an auxiliary function, the jacking gear also helps to maintain a protective oil membrane at all shaft journal bearings . Hogging is when the shaft bows upwards due to thermal stratification. On the engine shaft of a marine vessel , this process also prevents the shaft from warping when a ship is preparing to achieve maneuvering status. MOTOR AND DRIVETRAINThe jacking gear motor is designed to rotate the shaft at approximately 1/10rpm. Most jacking gear motors are rated at 5hp
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