NationMaster - Encyclopedia: Machinery

A machine is any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of tasks. It normally requires an input as a trigger, transmits the modified energy to an output, which performs the desired task.

Mechanical mechanisms and machines have been in steady use to amplify the abilities of human beings since before written records were available. The primary difference between simple tools and simple mechanisms or machines is a power source and a somewhat independent operation. The term machine generally applies to an assembly of parts operating together to perform work. Generally these devices increase intensity of applied force, changing direction of force, or changing one form of motion or energy into another.

The mechanical advantage of a machine is the ratio between the resistance or load, and the force required to overcome it, although this ratio is not entirely accurate as force is required to overcome friction, as well. To compensate for this, mechanical advantage is calculated as the ratio between the distance moved by the force applied, and the distance moved by the resistance.

Efficiency of a machine is the degree or percentage to which a machine accomplishes the work it could do without the restrictions of friction.

Modern power tools, automated machine tools, and human operated power machinery complicate this definition greatly. Machines used to transform heat or other energy into mechanical energy are known as engines.

Contents

1 Simple machines or mechanical components

2 Clock

3 Compressors and Pumps

4 Internal combustion engine

5 External combustion engine

6 Turbine

7 Computing machines

8 Automated machines

9 Biological machines

Simple machines or mechanical components

Bearing
Driveshaft
Gear
Lever
Pulley
Screw
Spring
Wedge
Winch

Clock

Compressors and Pumps

Internal combustion engine

External combustion engine

Turbine

Computing machines

Automated machines

Biological machines

Virus, Bacterium
Cell (biology)
Plant and animal
Human being
The mind - controversially

Major fields of technology	Edit (http://en.wikipedia.org/w/wiki.phtml?title=MediaWiki:Technology-footer&action=edit)
Biotechnology \| Computing technology \| Electrical engineering \| Electronics \| Microtechnology \| Nanotechnology \| Biomedical engineering \| Energy storage \| Machinery \| Space technology \| Nuclear technology \| Visual technology \| Weapons technology \| Telecommunication \| Transport

Categories: Mechanical engineering | Manufacturing | Electro mechanical engineering | Production and manufacturing

Results from FactBites:

NodeWorks - Encyclopedia: Association for Computing Machinery (363 words)
	The Association for Computing Machinery, or ACM, was founded in 1947 as the world's first scientific and educational computing society.
	ACM is organized into over 170 local chapters and 34 special interest groups (SIGs), through which it conducts most of its activities.
	Examples include the famous "GOTO considered harmful" letter, the issue of what to call the then-fledgling field of computer science, and the issue of changing ACM's name (since the "machinery" in question is no longer the size of a house and is now measured in micrometres).

More results at FactBites »

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