Machines can assist in improving production efficiency in the workplace. However these machines have moving parts, sharp edges, and hot surfaces with the potential to cause severe workplace injuries such as crushed fingers or hands, amputations, burns, or blindness. Safeguards are essential for protecting workers from these preventable injuries. Any machine part, function, or process that might cause injury must be safeguarded. When the operation of a machine may result in a contact injury to the operator or others in the vicinity, the hazards must be eliminated or controlled.
via CDC – Machine Safety – NIOSH Workplace Safety and Health Topic.