Mechanical Definitions |
Portal crane : It is a jib crane which is carried on
a four-legged portal which is built in order to run on rails.
|
Post Brake : It is a brake which is occasionally fitted
on a steam winder or haulage. It has two upright posts mounted
on either side of the drum that operate on brake paths which
are bolted to the drum cheeks. |
Pot Die Forming : The process of forming sheet or plate
metal by means of a hollow die by the application of pressure
that causes the workpiece to assume the contour of the die.
|
Power-actuated Pressure Relief Valve : It is a pressure
relief valve which is connected to and controlled by a device
which is used to utilize a separate energy source. |
Power Control Valve : It is a safety relief device which
is operated by a power-driven mechanism instead of by pressure.
|
Power Drill : It is an electric drill. |
Power Saw : It is a power-operated woodworking saw, a
bench or circular saw for example. |
Power Shovel : It is a power-operated shovel which is
designed to excavate and remove debris. It carries a short boom
on which rides a movable dipper stick carrying an open-topped
bucket. In other words, it is a bucket equipped electric machine
that is used for digging and loading earth or fragmented rock
material. |
Power Station |
Power Stroke : The stroke in an engine is called power
stroke, during which pressure is applied to the piston by expanding
steam or gases. |
Precision Grinding : The process of grinding to specified
dimensions and low tolerances. |
Precooler : It is a device which is used to reduce the
temperature of a working fluid before it is used by a machine.
|
Press Slide : It is a reciprocating member of a power
press. The punch and upper die are fastened on it. |
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