Podcast
Questions and Answers
What is most commonly responsible for wire rope failures?
What is most commonly responsible for wire rope failures?
What property of a rope increases with larger diameter and swaging?
What property of a rope increases with larger diameter and swaging?
How is the safe working load (SWL) calculated according to ACOP guidance?
How is the safe working load (SWL) calculated according to ACOP guidance?
What improves the abrasion resistance of the rope?
What improves the abrasion resistance of the rope?
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How is fatigue resistance in wire ropes improved?
How is fatigue resistance in wire ropes improved?
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What is an example of equipment design problems contributing to rope failure?
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?
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?
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?
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?
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?
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?
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?
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?
What occurs when wire rope undergoes bending around sheaves or redirect stumps?
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What is the purpose of keeping training notes?
What is the purpose of keeping training notes?
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How is the Safe Working Load (SWL) mathematically determined?
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?
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?
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?
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?
What circumstances lead bending on wire rope to increase stress exponentially?
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What is the required experience for an intermediate operator?
What is the required experience for an intermediate operator?
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What equipment must trainees work with before progressing to steeper terrain?
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?
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?
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?
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?
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?
What is the first step in the risk management process?
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What does 'risk' primarily consider?
What does 'risk' primarily consider?
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What is a minimum exclusion zone when using redirects in winch operations?
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?
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?
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?
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?
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?
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?
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?
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?
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?
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?
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?
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.
