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Machine Guarding Safety

Machine Guarding Safety



There are many hazards associated with moving / rotating mechanical parts. These can include the movement of rotating members, reciprocating arms, moving belts, meshing gears, cutting teeth, and any parts that impact or shear. Safeguard is a solution or a combination of solutions that eliminate the risk of exposure to hazardous moving parts or other harmful conditions and prevent injuries.


Machine Guarding Safety

Dangerous moving parts in these three basic areas need safeguarding 


Point of Operation : is the area  where work is being done on a material , such as cutting, shaping , boring or forming of material.

Power Transmission Apparatus : is the area of the mechanical system that transmits energy to the parts of the machine performing the work. These components include flywheels , pulley, belts, connecting rods, coupling rods, couplings, cams, spindles, chains, cranks, and gears.



Other Moving Parts : include all parts of a machine that move while the machine is operating. These parts can be rotating , reciprocating, or transverse moving parts. As well as feed mechanisms and auxiliary parts of the machine.

These machines and items are shown in their unguarded state to demonstrate the danger zone.





Requirements for safeguards:

Prevent contact : The safeguard must prevent hands, arms, and any other part of an operators body from making contact with dangerous moving parts. A good safeguarding system eliminates the possibility of the operator or another worker placing parts of their bodies near hazardous moving parts.

Secure: Operators should not be able to easily remove or tamper with the safeguard, because a safeguard that can easily be made ineffective is no safeguard at all. Guards and safety devices should be made of durable material that will withstand the conditions of normal use. The must be firmly secured to the machine.

Protect from falling objects: The safeguard should ensure that no objects can fall into moving parts. A small tool dropped into a cycling machine could easily become a projectile that could strike and injure someone.




Create no new hazards : A safeguard defeats its own purpose if it creates a hazard such as a shear point, a jagged edge , or an unfinished surface that could cause a laceration. The edge of guards, for instance, should be rolled or bolted in such a way to eliminate sharp edges.

create no interference : Any safeguard that impedes an operator from performing the job quickly and comfortable might soon be overridden or disregarded. Proper safeguarding may actually enhance efficiency since it relieves the operators apprehensions about injury.

Allow safe lubrication : if possible , workers should be able to lubricate the machine without removing the safeguards, Locating oil reservoirs outside the guards, with a line leading to the lubrication point, will reduce the need for the operator or maintenance operator to enter the hazardous area.



Do's:


* Ensure that only authorized personnel may remove the fastener on the guards.

* Guards should be designed in such a way that they do not need to be removed during machinery repairs or adjustment.

* Ensure that the opening between the guards and machines minimal to prevent the operators body parts reaching the danger point.

* Ensure that all starting or stopping controls should be within easy reach . The emergency stop must be accessible and clearly identified. To restart a machine , always require a manual restart.

* Inspection, review and preventive maintenance should always be carried out. Have a preventive maintenance program to include inspection of all machine guarding.



Dont's 


* Do not remove the guards

* Do not alter the guards

* Do not make the interlock guards non operative

* If guards are removed for maintenance , do not start the machine unless guards in place

* Do not allow unauthorized person to work on the machine.

* Do not use poorly designed guards,

* Do not wear loose cloths and jewels, don't keep long hairs.



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