Notes on Mechanical Hazards and Machine Safeguarding

Mechanical Hazards and Machine Safeguarding

Understanding Mechanical Hazards

  • Mechanical Hazards involve any risks associated with machinery that can cause harm to operators or workers nearby.

    • Types of actions leading to mechanical hazards include:

    • Cutting

    • Puncturing

    • Shaping

    • Shearing

    • Crushing

    • Forming

    • Bending

    • Straining

    • Boring

Key Types of Mechanical Hazard Actions

  • Cutting:

    • Involves body parts coming into contact with sharp edges, primarily at the point of cutting operations.

    • Risks include flying chips or scrap materials that may injure operators.

  • Shearing:

    • Related to trimming or shearing metal using powered slides or knives.

    • Hazards are prominent at the point of shearing operation.

  • Puncturing:

    • Achieved by applying power to create a blank, that punctures or stamps materials.

    • Danger arises at the operational point where the force is applied.

  • Bending:

    • Similar to puncturing, where power applies to a slide for bending materials.

    • Hazards appear at the operation's point of application of force.

Mechanical Hazards - Motions

  • Rotating Parts:

    • Rotating components can entrap clothing or limbs, especially at nip points which are formed between rotating and stationary parts.

    • Even slow rotating parts can pose significant risks.

  • Reciprocating Motion:

    • Back-and-forth movements can trap or pinch workers between moving parts.

  • Transversing Motion:

    • Parts that move laterally can cause risk by striking or pinching a worker in the process.

Machine Safeguarding

  • The purpose of securing machine operations includes minimizing accident risks related to direct contact between the operator and machinery.

    • Hazards can arise from:* Operator fatigue, distraction, or equipment malfunction that exposes parts or creates debris hazards.

  • Effective safeguards must prevent human contact with harmful machine parts, do not create further hazards, and allow maintenance access.

  • There are many ways to safeguard machines depending on : ■ Type of operation ■ Size or shape of machine ■ Physical layout of the work area ■ Type of material

Types of Safeguards

  1. Guards:

    • Always preferred, especially for power transmission hazards.

    • Examples include fixed guards enclosing moving parts like belts and gears.

  2. Devices:

    • Control mechanisms might be used but are less preferred compared to physical guards, more practical option when safeguarding point of operation.

Lockout/Tagout System

  • Essential for preventing unexpected machine activation during maintenance.

    • Lockout System: Utilizes a padlock to secure the machine off until servicing is complete.

    • Tagout System: Similar approach but uses tags to indicate that a machine should remain off.

Training and Awareness

  • Operators must be trained effectively to use safeguarding measures properly to reduce risks associated with mechanical hazards.

  • Regular training is critical when new safeguards are implemented or existing ones are modified.

Personal Protective Equipment (PPE)

  • PPE must be suitable for specific hazards and maintained in good condition to be effective.

    • Must be cleaned, functional, and stored properly to avoid damage.

Conclusion and Best Practices

  • Always utilize tagout procedures for machine servicing.

  • Conduct regular inspections and maintenance of machinery and safeguarding equipment to ensure effectiveness.

  • Prepare for emergencies through drills, and implement human factor considerations to manage fatigue and prevent injuries.