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8/11/2019 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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