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TermDefinition
gear generally used to mean fittings, tools, equipment, or any part of a machinery
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TermDefinition
flotsam goods and ship's gear that remain afloat after shipwreck
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geared ship ship equipped with own derricks or cranes for cargo operations

opposite of gearless ship
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gearless ship ship which is not fitted with own derrick or crane; shore cranes will be required at ports for cargo operations

opposite of geared ship
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gyropilot instrument fitted with a gyroscope and designed to maintain the vessel's sailing direction automatically according to a given setting by controlling the steering gear; also known as Automatic Pilot
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helical gear gear with teeth at its rim cutting an angle to the axis
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positive displacement pump one broad category of pump designed to positively displaced liquid from the suction to the discharge side by mechanical variation of the volume; it is characterised by its self-priming action; examples of such pump are reciprocating pumps using piston or plunger in a cylinder, and rotary pumps using gear, screw or vane to force the liquid through
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rudder stock the vertical shaft that connects the rudder to the steering gear
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spur gear gear in which the teeth around its rim is cut parallel to the axis
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steering gear the complete machinery and arrangement which enables the steering wheel in the wheel house to control the position of the rudder; the main gear must meet certain performance requirements such as:-
a) capable of putting the rudder over from 35o on one side to 35o on the other when the ship is moving ahead at maximum service speed;
b) capable of putting the rudder over from 35o on one side to 30o on the other in 28 seconds at maximum service speed
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telemotor a steering gear for the remote control of rudder's position to effect steering of a ship; may be hydraulic or electric and used when the distance between the bridge and the steering unit is large; in a hydraulic system, turning of the steering wheel causes a control pressure to be transmitted by means of two small pipes to the control valves of the steering gear, which in turn moves the rudder
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tribology science of lubrication, friction and wear when surfaces 'rub' together; applies to the design of bearings, gears, slides, etc.
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tugger winch a small drum winch designed to assist the crew in manipulating the heavy pieces of towing gear such as chain bridles, towing plates and large towing wires used in anchor-handling or ship-handling work; commonly fitted in offshore vessels at the cargo deck area behind the superstructure
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turning gear mechanism for rotating the crankshaft of main engine during engine overhaul or engine preparation before starting; the electric motor-driven gear has arrangement to engage or disengage the shaft
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worm gear a kind of gearing which consists of a worm engaging a worm wheel, the axes of both are at right angles to each other; the worm, being restricted by fixed bearings, can only rotate without moving in an axial direction; the screw thread on the worm engages the teeth on the worm wheel and when rotated, the worm pulls or pushes the worm wheel causing rotation; used when large speed reduction ratio is desired such as in electric winches, capstans, etc.
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