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Mechanical Definitions

Pickoff : It is a mechanical device which is used to remove the finished part automatically from a press die.

Pile Driver : It is a mechanical device which is used to drive piles into soil to provide foundation support for buildings or other structures.

Pile Hammer : The heavy weight of a pile driver which depends on gravity for its striking power. It is designed to drive piles into the ground. It is also called Drop Hammer.

Pilot Drill : It is a type of small drill which is used to start a hole to ensure that a larger drill will run true to center.

Pinion : It is usually the smallest gear in a gear drive train.

Piston : It is a component of reciprocating engines, pumps and gas compressors. It is located in a cylinder and is made gas-tight by piston rings. It is used to transfer force from expanding gas in the cylinder to the crankshaft via a piston rod and/or connecting rod.

Piston Corer : It is a steel tube which is driven into the sediment by a free fall and by lead attached to the upper end. It is able to recover undistorted vertical sections of sediment.

Piston Displacement : The volume which is displaced in a single stroke by a piston in a cylinder, equal to the distance which the piston travels times the internal cross section of the cylinder.

Piston Valve : It is a device which is used to control the motion of a fluid along a tube or pipe through the linear motion of a piston within a chamber or cylinder.

Plain Turning : Lathe operations those are involved when machining a workpiece between centers can be called plain turning.

Planer : It is a machine which is designed for the shaping of long, flat, or flat contoured surfaces by reciprocating the workpiece under a stationary single-point tool or tools. It may refer to several types of carpentry tools, woodworking machines or metalworking machine tools.

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