Mechanical Definitions |
Back-draft damper : A damper with blades actuated by
gravity, permitting air to pass through them in one direction
only.
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Backing pump : A vacuum pump, in a vacuum system using
two pumps in tandem, which works directly to the atmosphere
and reduces the pressure to an intermediate value, usually
between 100 and 0.1 pascals. It is also known as Fore Pump.
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Backwater valve : A type of check valve in a drainage
pipe where reversal of flow causes the valve to close and
cutting of flow. It is also known as Back Flow Valve.
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Baler : A machine which takes large quantities of raw
or finished materials and binds them with rope or metal straps
or wires into a large package.
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Ball-bearing hinge : A hinge is equipped with ball
bearings between the hinge knuckles in order to reduce friction.
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Band brake : A band brake is a steel or Invar tape,
graduated in feet and at least 100 feet i.e. 30.5 meters long
which can be used for accurate surveying.
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Batcher : A machine in which the ingredients of concrete
are measured and combined into batches before being discharged
to the concrete mixer.
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Bearing : A machine part that supports another part
which rotates, slides or oscillates in or on it.
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Belt drive : A belt drive is used for transferring
motion from one pulley to another pulley using a belt.
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Belt sander : A belt sander is a portable, power-driven
abrasive coated continues belt.
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Bending machine : A machine for bending a metal or
wooden part by pressure. It can also be known as bender.
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Bendix-Weiss universal joint : A universal joint that
provides for constant angular velocity of the driven shaft
by transmitting the torque through a set of four balls lying
in the plane that contains the bisector and is perpendicular
to the plane of the angle between the shafts.
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