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

11006115 Copyright Business & Legal Reports, Inc.

Machine Guarding 29 CFR 1910.211 to 1910.219

Occupational Health and Safety Program


Basic Standard

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


Regulatory Requirements

Regulatory requirements found in 29 CFR 1910, Subpart O.

Applies to specific types of equipment. Delineates general requirements.


Where Mechanical Hazards Occur

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


Hazardous Mechanical Motions

Rotating Reciprocating Transverse


Hazardous Actions

Cutting Punching Shearing Bending


Types of Rotating Mechanisms

Collars Couplings Cams Clutches Flywheels Shaft ends Spindles


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.


Types of Reciprocating Motions

Back and forth Up and down


Types of Transverse Motions

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


Cutting Actions

Include:– Rotating motions– Reciprocating motions– Transverse motions


Types of Cutting Mechanisms

Band saws Circular saws Boring or

drilling machines Lathes Milling machines


Types of Punching Actions

A ram mechanism– Blanks– Draws – Stamps

Used on metal or other materials.


Types of Punching Equipment

Power presses Iron working equipment


Types of Shearing Actions

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


Types of Shearing Equipment

Shears that are operated:– Hydraulically– Mechanically– Pneumatically


Types of Bending Actions

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

Used on metal or other materials.


Types of Bending Equipment

Power presses Press brakes Tubing benders


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


Classifications of Safeguards

Guards Devices Location/distance Feeding and ejection methods Miscellaneous aids


Types of Guards

Fixed Interlocked Adjustable Self-adjusting


Types of Devices

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

Pullbacks or Restraints


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


Location/Distance

Makes it virtually impossible to contact moving parts.

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


Feeding and Ejection Methods

Automatic feed Semiautomatic feed Automatic ejection Semiautomatic ejection Robot


Miscellaneous Aids

Awareness barriers Protective shields Hand-feeding tools and holding fixtures


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.


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.


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.


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.


Example-Rotating Parts Hazards


Example-Common Nip Points


Example-Dangerous Cutting Actions


Example-Guard


Example-Guard


Thank You For Your Participation

Safety is as simple as ABC

Always Be Careful

Date post:	11-Jan-2016
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11006115 Copyright Business & Legal Reports, Inc. Machine Guarding 29 CFR 1910.211 to 1910.219...

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