Basics of Machine Guarding
The basic types of hazardous mechanical motions and actions are:
- Motions:
- Rotating (including in-running nip points)
- Reciprocating
- Transversing
- Actions:
- Cutting
- Punching
- Shearing
- Bending
Minimal general requirements for safety guards:
- Prevent contact - must prevent hands, arms, and any other part of the body from making contact with moving parts
- Be secure - workers should not be able to easily remove or tamper with the safety guard
- Should be made of durable material that will withstand the conditions of normal use
- Must be firmly secured to machine
- Protect from falling objects - ensure that no objects fall into moving parts
- Create no new hazards - the guard defeats its own purpose if it creates a hazard of its own such as a shear point, jagged edge, or unfinished surface
- Create no interference - proper safety guarding can actually enhance efficiency since it can relieve the worker's apprehensions about injury
- Allow safe lubrication - one should be able to lubricate the machine without removing the safety guards
- Locate oil reserves outside the guard with a line leading to the lubricating point
Thorough operator training should involve instruction and/or hands on training in the following:
- A description and identification of hazards associated with particular machines
- The safety guards themselves, how they protect, and the hazards they are intended to protect the worker from
- How to use safety guards and why
- How and under what circumstances safety guards can be removed, and by whom
- What to do (contact supervisor) if guard is damaged, missing, or unable to provide protection
- This training is necessary for new operators, maintenance or setup personnel when any new or altered safety guards are put into service, or when workers are assigned to a new machine or operation
Look for Heroic Safety's future Safety Huddle on specific OSHA machine guarding requirements. Always consult the OSHA standards for further details.