Mechanical Definitions |
Properties for Material
Selection |
Propulsion : The process of driving or propelling is
called propulsion as in jet propulsion. |
Protected Coating : It is a function by virtue of the
interposition of a continuous physical barrier between the coated
surface and its environment. |
Puddle : In puddling furnace the batch of puddling iron
is called puddle. |
Pull Broach : It is a tool which is used for cutting
internal grooves or finishing holes of some shape by being pulled
by the work. |
Puller : It is a mechanical or hydraulic device used
to remove parts which are tightly fitted. Wheel puller, gear
puller for example. Puller removes parts by pulling action.
|
Pulley : It is a device designed to lift heavy loads
by using less force. |
Pulley Block : It is a sheave or series of pulleys which
are enclosed between metal or wooden side plates that carry
the shaft or pin on which pulleys revolve. |
Pulley Lathe : It is a lathe which is used for turning
either a straight or crowned face on pulleys. |
Pulley Tap : It is a tap having a very long shank and
used to tap setscrew holes in the hubs of pulleys. |
Pull Pin : It is a device which is used to throw mechanical
parts in or out of gear, or to shift in or away from a fixed
relative position. |
Pulsation Welding : It is a spot, projection or steam
welding in which the welding current is interrupted one or
more times without release of pressure or change of location
of electrodes. It is also called Multiple-impulse Welding. |
Pump : It is a machine which is used for lifting or moving
liquids, gases or slurries by a bucket or a piston working in
the cylinder. It moves liquids or gases from lower pressure
to higher pressure, and overcomes this difference in pressure
by adding energy to the system, as a water system. |
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