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What is the definition of machine guard?

A shield or cover over hazardous areas on a machine to prevent accidental contact with body parts or to prevent debris, such as chips, from exiting the machine.

Learn more about machine guard in the class "Lockout/Tagout Procedures 130" below.

Lockout/Tagout Procedures 130

Safety Department
Class Information
Tooling U classes are offered at the beginner, intermediate, and advanced levels.
The typical class consists of 12 to 25 lessons and typically requires at least two hours of instruction time.
Class NameLockout/Tagout Procedures 130
DescriptionThis class covers lockout/tagout requirements and procedures and includes an explanation of employees' roles during lockout/tagout. Includes an Interactive Lab.
Prerequisites none
DifficultyBeginner
Number of Lessons17
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Class Outline
Class Objectives
  • Objectives
    		•
  • What Is Lockout/Tagout?
    		•
  • Forms of Energy
    		•
  • Lockout Devices
    		•
  • Tagout Devices
    		•
  • Determining Devices for Lockout
    		•
  • Blockout Devices and Methods
    		•
  • Knowing When the Standard Applies
    		•
  • Requirements for Lockout/Tagout Devices
    		•
  • Energy Control Program
    		•
  • Affected and Authorized Employees
    		•
  • Typical Minimal Lockout Procedure: Part I
    		•
  • Typical Minimal Lockout Procedure: Part II
    		•
  • Typical Minimal Lockout Procedure: Part III
    		•
  • Training
    		•
  • Preventing Accidents
    		•
  • Summary
    		•
  • Define lockout/tagout.
    		•
  • Match the forms of energy with their descriptions.
    		•
  • Describe the purpose of a lockout device.
    		•
  • Describe the purpose of a tagout device.
    		•
  • Describe requirements that make devices capable of lockout.
    		•
  • Identify examples of blockout.
    		•
  • Identify instances when the lockout/tagout standard applies.
  • Identify requirements for lockout/tagout devices.
    		•
  • Describe the basic requirements of an energy control program.
  • Distinguish between affected and authorized employees.
    		•
  • Define typical minimal lockout procedure.
    		•
  • List the sequence of steps for a typical minimal lockout procedure.
    		•
  • List the sequence of steps for restoring equipment to service after lockout.
  • Match employee categories with their lockout/tagout training requirements.
    		•
  • Describe the importance of continuity during the lockout/tagout procedure.
    		•
    Class Vocabulary
    TermDefinition
    affected employee An employee who normally works on or near a machine that must be locked out for maintenance.
    authorized employee An employee who is qualified to lock out machinery and perform maintenance.
    bleeding The process of safely removing liquid or gas from a closed system.
    blockout A type of energy-isolation device that physically prevents the flow or movement of energy.
    cable tie A long, thin plastic or nylon fastening device that locks when the point on one end is threaded through the loop on the other.
    chemical energy Power created by the reaction between two or more substances.
    Control of Hazardous Energy OSHA's proper title for the lockout/tagout safety standard. The standard protects employees by requiring practices and procedures that prevent accidental machine startup for machines that are undergoing maintenance.
    electrical energy A form of power created by the movement of electrons. Electrical energy, or electricity, can cause electric shock.
    energy control program A written procedure required by OSHA and developed by the employer that explains how to control hazardous energy in the workplace.
    energy-isolating mechanism A mechanical device that physically prevents the transmission or release of energy, such as a circuit breaker or valve.
    grounding Diverting stray electrical current to a neutral source.
    hasp A metal or plastic locking mechanism consisting of a hinged closure with a slot that closes over a loop. The loop is then secured with a lock.
    hydraulic energy Power created by the compressive force or movement of a liquid in a confined area. Machines that lift objects often use hydraulic energy.
    lockable electric disconnect switch A power switch that can be shut off and then locked in the "off" position.
    lockout device A device that uses positive means such as a lock and key or combination lock to hold an energy-isolating mechanism in a safe position and prevent equipment or machinery from being energized.
    lockout/tagout The common term for OSHA's Control of Hazardous Energy Standard. Lockout/tagout practices protect employees by preventing accidental machine startup through proper locking and labeling of machines that are undergoing maintenance.
    machine guard A shield or cover over hazardous areas on a machine to prevent accidental contact with body parts or to prevent debris, such as chips, from exiting the machine.
    maintenance The necessary and basic support and repair of machines. Maintenance includes tasks such as lubricating, adjusting, and replacing parts.
    mechanical energy A combination of kinetic and potential energy resulting from the force of gravity or the movement or release of a machine component, such as a spring, clamp, or wheel.
    pneumatic energy Power created by the compressive force or movement of air or gas in a confined area. Assembly tools often use pneumatic energy to force parts together.
    potential energy Power that is stored or suppressed or that exists because of its position and the effects of gravity. Machines that have large components that raise and lower, such as a press, contain potential energy that becomes kinetic energy when it is released.
    print format The appearance of letters on the tag or device, including style, color, and size.
    tag attachments Devices such as cable ties that connect tags to energy isolation mechanisms or locks.
    tagout device A prominent warning device, such as a tag, that can be securely attached to an energy-isolating mechanism to alert employees that equipment is not to be operated until the tag is removed.
    thermal energy Power created by or in the form of heat. Heat can be retained in machine parts and cause burns.
    typical minimal lockout procedure The minimum steps required to lock out a machine. OSHA provides a form for employers to record these steps, including details about the employees involved and type of energy used.
     
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