osha machine safeguarding

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    MachineGuarding

    Subpart O

    29 CFR 1910.211

    29 CFR 1910.219

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    Where Mechanical Hazards Occur

    Point of operation

    All parts of the machine which move,

    such as:

    flywheels, pulleys, belts, couplings, chains,

    cranks, gears, etc.

    feeding mechanisms and auxiliary parts of the

    machine

    In-running nip points

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    Point of Operation

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    ROTATING PARTS

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    NIP POINTS

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    Machine Hazards

    Cutting

    Shearing

    Stabbing and Puncturing

    Impact

    Entanglement

    Friction and Abrasion

    Crushing Projectiles and Energy Release

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    Cutting

    Circular Saws

    Milling Machines

    Band Saws

    Angle Grinder

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    Shearing

    Power Press

    Metal Planning

    Machine

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    Stabbing and Puncturing

    Flying Objects

    Material ejected

    from a machine. Rapidly moving

    parts of machinery

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    Impact

    Objects which strike

    the human body

    (rotating arm of arobot).

    Planning machine

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    Friction and Abrasion

    Grinding wheel

    The belt of a beltsanding machine

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    Crushing

    Crushing occurs whenpart of the body iscaught between a fixedand moving parts of a

    machine. Between two moving

    parts

    Between moving partsand fixed structure.

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    Methods of Machine

    Safeguarding

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    Types of Safeguards

    Guards

    Devices

    Location/Distance

    Potential Feeding and Ejection Methods

    Miscellaneous

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    Guards

    Fixed

    Interlocked

    Adjustable

    Self-Adjusting

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    Fixed Guards

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    Interlocked Guards

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    Adjustable Guards

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    Devices Photoelectric Sensor

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    Pullback

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    Restraint Device

    Uses cables or straps attachedto the operators hands and a

    fixed point

    Must be adjusted to let theoperators hands travel within

    a predetermined safe area

    Hand-feeding tools are oftennecessary if the operation

    involves placing material into

    the danger area

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    Two-Hand Control

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    Body Bar

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    Location/Distance

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    Automatic Feeding

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    ROBOT

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    Miscellaneous Aids

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    Abrasive Wheel Machinery

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    Abrasive-Wheel Machinery

    Tool rest within 1/8 of wheel

    Tongue guard within 1/4 of wheel

    Outer wheel guard must be in place

    Grinder must be securely attached

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    Ring Test

    1. Clean material from grinding wheel.

    2. Let wheel dry before testing.3. Tap wheel with something non-metallic such as a

    screwdriver handle.

    4. Tap1

    /2inch from outside rim.5. Rotate wheel 45 degrees and repeat test.

    6. A sound, undamaged wheel will give off a clear

    metallic ring. A cracked wheel will give off a dull

    sound with little or no rin

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