The idea of a simple machine originated with the Greek philosopher Archimedes, who studied the machines, lever, pulley, and screw, and discovered the principle of mechanical advantage in the lever. Furthermore, the Greek Philosophers defined the classic five simple machines, which were used to roughly calculate the mechanical advantages.
Many different types of machinery and equipment use high integrity safety systems that disable a mechanism at the time of access. Some examples include: • brake press • power press • robotic machine (automated machines) • injection moulders • powered guillotines • programmable lathe and milling equipment • industrial mixers • mincing equipment • plasma cutting tables • laser cutting tables.
Failure to replace guards, damaged perimeter fences that allow access, and bypassed or disabled interlocking systems, are examples of critical safety systems failures that require immediate attention to ensure the safety of people.
Administrative controls use systems of work to reduce risk by providing a framework of expected behaviours. Examples are rotation of staff to reduce exposure to a hazard, or a documented safe system of work, such as lockout tagout. These types of controls rely on extensive instruction, information, training and supervision.