11006115 Copyright Business & Legal Reports, Inc. Machine Guarding 29 CFR 1910.211 to 1910.219...

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11006115 Copyright Business & Legal Reports, Inc.

Machine Guarding 29 CFR 1910.211 to 1910.219

Occupational Health and Safety Program

11006115 Copyright Business & Legal Reports, Inc.

Basic Standard

Any machine part, function, or process that may cause injury must be safeguarded.

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Regulatory Requirements

Regulatory requirements found in 29 CFR 1910, Subpart O.

Applies to specific types of equipment. Delineates general requirements.

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Where Mechanical Hazards Occur

The point of operation. In the power transmission apparatus. Other moving parts.

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Hazardous Mechanical Motions

Rotating Reciprocating Transverse

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Hazardous Actions

Cutting Punching Shearing Bending

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Types of Rotating Mechanisms

Collars Couplings Cams Clutches Flywheels Shaft ends Spindles

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Nip Points

Caused by rotating parts. Causes include:

– Parts rotating in opposite directions.– Parts rotating in longitudinal motion (belt &

pulley).– Parts rotating close to a fixed part.

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Types of Reciprocating Motions

Back and forth Up and down

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Types of Transverse Motions

Straight and in a continuous line. Examples include two pulleys and a belt.

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Cutting Actions

Include:– Rotating motions– Reciprocating motions– Transverse motions

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Types of Cutting Mechanisms

Band saws Circular saws Boring or

drilling machines Lathes Milling machines

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Types of Punching Actions

A ram mechanism– Blanks– Draws – Stamps

Used on metal or other materials.

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Types of Punching Equipment

Power presses Iron working equipment

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Types of Shearing Actions

Uses a powered slide or knife. Done to trim or shear metal or other materials.

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Types of Shearing Equipment

Shears that are operated:– Hydraulically– Mechanically– Pneumatically

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Types of Bending Actions

Power is applied to a slide to:– Draw – Stamp

Used on metal or other materials.

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Types of Bending Equipment

Power presses Press brakes Tubing benders

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Requirements for Safeguards

Minimum general requirements include:– Prevent contact– Secure– Protect from falling objects– Create no new hazards– Create no interference– Allow for safe lubrication

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Classifications of Safeguards

Guards Devices Location/distance Feeding and ejection methods Miscellaneous aids

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Types of Guards

Fixed Interlocked Adjustable Self-adjusting

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Types of Devices

Presence Sensing– Photoelectrical (optical)– Radio frequency (capacitance)– Electromechanical

Pullbacks or Restraints

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Types of Devices

Safety Controls– Safety trip control

• Pressure-sensitive body bar• Safety tripod• Safety tripwire cable

– Two-hand control– Two-hand trip

Gates– Interlocked– Other

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Location/Distance

Makes it virtually impossible to contact moving parts.

Separates operators from the equipment. Limited by the available workspace.

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Feeding and Ejection Methods

Automatic feed Semiautomatic feed Automatic ejection Semiautomatic ejection Robot

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Miscellaneous Aids

Awareness barriers Protective shields Hand-feeding tools and holding fixtures

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Guards

Fixed-Provides a barrier. Interlocked-Shuts off or disengages power and

prevents starting of machine when guard is open. Adjustable-Provides a barrier which may be adjusted

to facilitate a variety of operations. Self Adjusting-Provides a barrier which moves

according to the size of the stock entering danger area.

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Devices

Photoelectric (optical)-Machine will not start cycling when the light field is interrupted.

Radiofrequency (capacitance)-Machine cycling will not start when the capacitance field is interrupted.

Electromechanical-Contact bar or probe travels a predetermined distance between the operator and the danger area.

Pullback-As the machine begins to cycle, the operator’s hands are pulled out of the danger area.

Restraint (holdback)-Prevents the operator from reaching into the danger area.

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Location/Distance

Machine or its dangerous moving parts must be so positioned that hazardous areas are not accessible or do not present a hazard to a worker during the normal operation of the machine.

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Feeding and Ejection Methods

Automatic Feed-Stock is fed from rolls, indexed by machine mechanism.

Semiautomatic Feed-Stock is fed by chutes, movable dies, dial feed, plungers or sliding bolster.

Automatic Ejection-Work pieces are ejected by air or mechanical means.

Semiautomatic Election-Work pieces are ejected by mechanical means which are initiated by the operator.

Robots-Perform work usually done by operator.

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Example-Rotating Parts Hazards

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Example-Common Nip Points

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Example-Dangerous Cutting Actions

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Example-Guard

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Example-Guard

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Thank You For Your Participation

Safety is as simple as ABC

Always Be Careful

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