Mechanical Definitions |
Bull wheel : The main wheel or gear of a machine, which
is usually the largest and strongest. A cylinder which has
a rope wound about it for lifting or hauling. A wheel attached
to the base of a derrick boom which swings the derrick in
a verticle plane.
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Bumper : A metal bar attached to one or both ends of
a powered transportation vehicle, especially an automobile,
to prevent damage to the body. In a drilling operation, the
supporting stay between the main foundation sill and the engine
block. In drilling, a fishing tool for loosening jammed cable
tools.
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Bundling machine : A device that automatically accumulates
can, cartons or glass containers for semiautomatic or automatic
loading or for shipping cartons by assembling the packages
into units of predetermined count and pattern which are then
machine wrapped in paper, film paperboard, or corrugated board.
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Buoyancy : The net upward buoyancy force is equal to
the magnitude of the weight of fluid displaced by the body.
This force enables the object to float or at least to seem lighter. |
Burner : A unit of a steam boiler which mixes and directs
the flow of fuel and air so as to ensure rapid ignition and
complete combustion.
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Burton : A small hoisting tackle with two blocks, usually
a single block and a double block, with a hook block in the
running part of the rope.
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Bush : To fit a hollow sleeve into some part in order
that it may serve as a bearing. In case of wearing, a new
bushing may be applied, avoiding the necessity of replacing
an entire part. In general, the insertion of any piece to
bring about a reduction of diameter.
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Bushing : A removable piece of soft metal or graphite-filled
sintered metal, usually in the form of a bearing, that lines
a support for a shaft.
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Buttress dam : It is a gravity dam resists the loads
to which it is exposed due to its mass. The buttresses are thin
walls of triangular profile with a sloping upstream face and
usually are spaced at equal intervals along the length of the
dam. |
Butterworth head : A mechanical hose head with revolving
nozzles; used to wash down shipboard storage tanks.
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Buzz saw : A name often applied to circular saw used
in wood working to create shuttering or mechanical structures.
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