Machine guarding devices are are essential for protecting workers from injuries in the working environments. Moving machine parts have the potential to cause severe workplace injuries, such as crushed fingers or hands, amputations, burns, or blindness. Thus, any machine part, function, or process that may cause injury must be safeguarded. When the operation of a machine or accidental contact injure the operator or others in the vicinity, the hazards must be eliminated or controlled.
Dangerous moving parts in three basic areas require safeguarding: the point of operation, power transmission apparatus, other moving parts. The placing of machine guarding devices must meet general requirements such as Prevent contact, Secure, Protect from falling objects, Create no new hazards, Create no interference, and Allow safe lubrication. In addition, non-mechanical hazards, such as high pressure system, vibrations, noises, high and low temperature objects and harmful chemicals and gases should not be ignored. Specially constructed safeguards, insulation, ventilation, and protective equipment and clothing are often used for preventing this kind of hazards.