A simple machine is a device that simply transforms the direction or magnitude of a force. It is a tool that consists of one or more parts, and uses energy to meet a particular goal. The evolution of machines started with the beginning of Industrial revolution, and brought changes in the fields of agriculture, manufacturing, mining, transportation, and technology, due to which there was a profound effect on the social, economic and cultural conditions of the times.
The modern machines include sensors, actuators and computer controllers. The machines are assembled, designed and used for the mechanisms and automation, where they are actually operated. They are further controlled by the controllers, which are also of a type of machines.
In terms of time and ongoing administration by managers and employers to ensure the desired behaviour occurs, administrative controls can be the most expensive and least effective form of hazard control.
Accidental start-up, or movement of a machine mechanism, can occur: • if control levers or buttons are bumped or knocked • if a short circuit of the control system occurs • when hydraulic or air pressure is released • when undoing retaining bolts. The word machine is derived from the Latin word machina. The modern meaning of the word is influenced due its specialized application in the military siege engines. They are also used in the stage engines, which are used in theater.
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