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Questions and Answers
What is most commonly responsible for wire rope failures?
What property of a rope increases with larger diameter and swaging?
How is the safe working load (SWL) calculated according to ACOP guidance?
What improves the abrasion resistance of the rope?
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How is fatigue resistance in wire ropes improved?
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What is an example of equipment design problems contributing to rope failure?
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What percentage of the minimum breaking strength defines the elastic limit of a wire rope?
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What defines the endurance limit of a wire rope?
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Which of the following actions should be taken if a strain is applied beyond the elastic limit?
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What is the minimum amount of experience a trainee operator must have before advancing to winch-assisted harvesting?
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Who supervises the training of the trainee operator during their initial experience?
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What is the recommended sheave to rope diameter ratio to minimize additional stress in cable logging applications?
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What is the role of the rope's core?
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What occurs when wire rope undergoes bending around sheaves or redirect stumps?
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What is the purpose of keeping training notes?
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How is the Safe Working Load (SWL) mathematically determined?
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What type of operator is expected to supervise and support trainee operators until competency is achieved?
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How often do Safe Behavior Observations (SBOs) occur for trainee operators?
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What is the effect of a larger shock load that exceeds the elastic limit?
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What circumstances lead bending on wire rope to increase stress exponentially?
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What is the required experience for an intermediate operator?
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What equipment must trainees work with before progressing to steeper terrain?
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What factor should be included when measuring the stress loading created by bending?
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What is the maximum slope degree for which trainees initially gain experience?
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What is the purpose of identifying hazards in the risk management process?
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Which of the following steps is NOT part of the risk management process?
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What is the first step in the risk management process?
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What does 'risk' primarily consider?
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What is a minimum exclusion zone when using redirects in winch operations?
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What is one of the tasks in conducting a risk assessment?
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Which area poses a serious hazard during winch-assisted harvesting?
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What should be done if risks cannot be eliminated according to the risk management process?
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What is the primary requirement for shackles used in steep slope harvesting?
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How many tucks per strand are required when splicing rope eyes?
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What should be checked daily on connectors used in steep slope harvesting?
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What is the purpose of using a heavy-duty chain segment in rigging?
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What is indicated by the Working Load Limit (WLL) on a shackle?
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What materials can be used for making eyes in wire ropes according to approved standards?
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Why is it important to prevent shock loading to the wire rope during use?
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What practice is recommended for managing the boundary between winch-assist and hand falling?
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Study Notes
Winch-Assisted Operator Training Programme
- Winch-assist training begins with mechanised felling machines, progressing to steeper terrain as competency is developed.
- Trainee operators must have a minimum of 20 working days (160 hours) of experience on slopes under 22 degrees before advancing to steeper slopes.
- Monthly Supervised Behaviour Observations (SBOs) are required for trainee operators by qualified personnel.
Experience Levels and Supervision
- Operators with less than 6 months or 500 hours on the machine undergo initial training and supervision.
- Intermediate operators, with over 6 months and 500–1000 hours of experience, receive assistance and supervision for the first three months, then quarterly.
- Operators must familiarize themselves with new machinery controls and capabilities before full competency is achieved.
Wire Rope Structure and Properties
- Wire ropes consist of individual wires twisted into strands, around a core. Rope structure includes a cable lay length, typically 15cm for a 1-inch rope.
- Key properties of ropes:
- Strength increases with larger diameters.
- Abrasion resistance improves with fewer or larger outer wires, and higher carbon content.
- Crushing resistance enhances with specific core configurations and swaging.
- Fatigue resistance is better with more or smaller wires and specific core designs.
Rope Strength and Safe Working Load (SWL)
- SWL is one-third of the rope's rated breaking load, ensuring a safety factor of three.
- Endurance limit occurs at 50% of breaking strength; failure may happen at repeated strains even below this threshold.
Bending and Shock Loading Considerations
- Bending occurs when ropes navigate around sheaves or redirects, increasing stress on the rope.
- Recommended sheave diameter to rope diameter ratio is at least 16:1 to minimize stress.
- Avoid shock loading as it can exceed the SWL, risking equipment failure.
Connector Strength and Maintenance
- Connectors must match or exceed the wire rope's SWL requirements, clearly marked for safety.
- Daily inspections of connectors are essential; systems should use registered maintenance schedules for monitoring safety.
Operational Situations and Safety Precautions
- Redirects, also known as rubbing or side-washing, should be planned for safe operations.
- Maintain exclusion zones around winch anchors, SSH machines, and areas near rigging for safety.
- Hazards during winch-assisted operations may lead to serious injury or operational failure.
Risk Assessment and Management
- Identify hazards that may cause harm, considering their potential impact.
- The risk management process includes identifying hazards, assessing risks, controlling them if unable to eliminate, and reviewing existing measures and urgency for action.
- A thorough risk assessment determines the severity of risks and the likelihood of occurrence, guiding control measures for safety.
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Description
This quiz covers the essential skills and competencies required for winch-assisted operator training. It starts with mechanised felling machines, progressing to steeper terrains and winch-assisted harvesting. Assess your knowledge of skill development and supervision within the context of operator training.
