Mechanical Definitions |
Planetary Gear Train : It is an assembly of meshed gears
which has a central gear, a coaxial internal or ring gear and
one or more intermediate pinions which are supported on a revolving
carrier. |
Planet Gear : A pinion is called a planet gear which
is placed in planetary gear train. |
Plate Coil : It is a heat-transfer device which is made
from two metal sheets which are held together, one or both plates
embossed to form passages between them to flow through for a
heating or cooling medium. It is can be termed as Panel Coil.
|
Plunge Grinding : The method of grinding is called plunge
grinding in which the wheel moves readialy toward the work.
|
Pneumatic Control Valve : It is a valve in which the
force of compressed air against a diaphragm is opposed in order
to control the area of the opening for a fluid stream by the
force of a spring. |
Pneumatic Drill : It is a type of drill which is a portable
percussive drill operated by compressed air. It is also known
as Jackhammer. |
Pneumatic Hammer : It is a hammer in which compressed
air is utilized to produce the impacting blow. |
Pole Air Lift Pump : It is a pistonless pump in which
compressed air fills the annular space surrounding the uptake
pipe and is free to enter the rising column at all points of
its periphery. |
Polar Timing Diagram : It is a diagram of the events
of an engine cycle which is relative to crankshaft position.
|
Pole Lathe : It is a simple lathe in which the work is
rotated by a cord that is attached to a treadle. |
Polishing Roll : It is a roll or a series of rolls on
a plastics mold with highly polished chrome-plated surfaces.
It is designed to produce a smooth surface on a plastic sheet
as it is extruded. |
Poppet valve : It is a valve with a hole usually round
or oval, and a tapered plug usually a disk shape on the end
of a shaft. It is also known as a Valve Stem. |
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