Machine safe guarding training
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Transcript of Machine safe guarding training
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Machine Guarding
Julian Kalac, P.EngJune 11, 2013
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Scenario• Printing press• 42 year old operator with 20 years exp.• Pinch point – 150psi• Distance from pinch point to safety stop
– 8 feet• No guards in place • Operator goes to remove a paper jam……..
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Result• Hospitalized for 1 week• Rehabilitation for 4-6 months• Severed tendons & nerves• Laceration to bone• Missing nerves & tendons• Loss of sensation• Loss of range or motion• Finger tips permanently bent
*These are onlyThe physical problems
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Any machine part, function, or process which may cause
injury must be safeguarded
Rule to Remember
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New Guardsfor Printing Press
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Types of Hazardous Mechanical Motions
and Actions• Rotating (including in-running nip points)• Reciprocating• Transverse
• Cutting• Punching• Pinching• Shearing• Bending
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Rotating Motion• Common rotating mechanisms
– Collars– Couplings– Cams– Clutches– Flywheels– Shaft ends– Spindles– Horizontal/vertical shafting
Dangerous moving parts in these basic areas require safeguarding:
1. Point of operation
2. In running nip points
3. Pinch points
4. Power transmission
5. Other moving parts
Where Dangerous Mechanical Hazards Occur
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Types of Machine Guards• Guards
– Fixed– Interlocked– Adjustable– Self-adjusting
• Devices– Presence sensing
• Photoelectrical (optical)• Radio frequency (capacitance)• Electromechanical
Machine Guards• Machines guards are there to protect from
exposed hazards• Guarding MUST never be removed unless
under supervision and locked out• If a Guard is missing notify your supervisor
immediately • Never bi-pass the guarding!
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Types of Machine Guards• Devices (cont’d)
– Pullback– Restraint– Safety controls
• Safety trip control– Pressure-sensitive body bar– Safety trip rod– Safety tripwire cable
• Two-hand control• Two-hand trip
– Gates• Interlocked• Other
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Fixed GuardProvides a barrier - a permanent part of the machine, preferable to all other types of guards.
Parts rotating in opposite direction
In-running nip point hazards
Rotating and tangentially moving parts
Rotating Parts
Point of contact between a chain and a sprocket
Examples of 3 Types of Motion
Rotating and fixed parts
Transverse motion
Rotating and tangential motion
Grinder Safety
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Grinder Safety (cont)
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Cutting Saws
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Point of contact Blade not guarded
Max Gap Allowable gaps Grinder
Guarded vs Ungarded Saw
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PINCH POINTS
LAMINATOR GUARDING
Interlocked Guarding
Mesh Guarding
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Adjustable GuardProvides a barrier which may be adjusted to facilitate a variety of production operations.
Bandsaw blade adjustable guard
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Self-Adjusting Guard
Provides a barrier which moves according to the size of the stock entering the danger area.
Circular table saw self-adjusting guard
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Two-Hand Control
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• Requires constant, concurrent pressure to activate the machine
• The operator’s hands are required to be at a safe location (on control buttons) and at a safe distance from the danger area while the machine completes its closing cycle
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Gate• Movable barrier device which protects the operator at the
point of operation before the machine cycle can be started
• If the gate does not fully close, machine will not function
Gate Open Gate Closed
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Safeguarding by Location/Distance
• Locate the machine or its dangerous moving parts so that they are not accessible or do not present a hazard to a worker during normal operation
• Maintain a safe distance from the danger area
Example #1 Slitter guarding using guards
Front view of guard
Example #1 SLITTER GUARDING USING MECHANICAL GUARDS
Example #2 Slitter guarding using light curtains
Example #2 Slitter guarding using light curtains
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Not Guarded
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Guarded
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Machine Safety Responsibilities
• Management– ensure all machinery is properly guarded
• Supervisors– train employees on specific guard rules in their areas– ensure machine guards remain in place and are functional– immediately correct machine guard deficiencies
• Employees– do not remove guards unless machine is locked and tagged– report machine guard problems to supervisors immediately– do not operate equipment unless guards are in place
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Training Questions
• Why must machines be guarded?• What are the machine hazards ?• When can you remove a guard?• What to do if a guard is missing or
damaged?
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Any machine part, function, or process which may cause
injury must be safeguarded
Rule to Remember
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QUESTIONS???