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.
Presence sensing systems. If physical guards cannot be used, then a presence sensing system can be used as a control to reduce risk. Presence sensing systems can be used where people enter areas shared by moving production equipment. Presence sensing systems are capable of providing a high degree of flexibility with regard to access.
Lower order machinery and equipment risk controls, such as personal protective equipment (PPE), can prevent injuries, but are generally not as effective as higher order controls, as they rely more on worker behaviour, maintenance programs and supervision.
When assessing machinery and equipment for possible non-mechanical hazards, consider how machinery and equipment can affect the area (environment) around them. People must be provided with safe access that is suitable for the work they perform in, on and around machinery and equipment.