11.4 Chainsaws, Chippers, Rigging, and Tool Control

Tool control from inspection to shutdown

Arborists work with tools that store energy, cut quickly, pull material, lift loads, and move heavy wood through crowded sites. The exam expects candidates to notice when a tool is not ready for use or when the work method creates an avoidable hazard. A sharp saw in the wrong hands, a chipper with poor infeed practices, or a rigging line without a clear drop zone can turn ordinary production into a serious incident.

Pre-use inspection is the first tool-control habit. Chainsaws need appropriate chain condition, tension, lubrication, throttle and chain brake function, handles, guards, and fuel handling. Chippers need guards, feed controls, emergency stop functions, discharge control, stable setup, and exclusion from the infeed area. Rigging gear needs inspection for wear, cuts, heat, chemical contamination, deformation, and compatibility.

Chainsaw scenarios often hinge on whether cutting should happen at all. A worker should not cut when the saw is damaged, the escape path is blocked, the target area is occupied, the branch is under unpredictable tension, the worker cannot maintain position, or communication is unclear. Aloft, saw use also depends on secure work positioning and keeping the cutting path away from ropes, lanyards, and body parts.

Chipper scenarios test entanglement and struck-by hazards. Loose clothing, drawstrings, gloves used carelessly near moving parts, vines, ropes, rakings, and short brush can pull a worker toward the infeed. Workers should follow the manufacturer's instructions, keep guards in place, maintain feed controls, and use safe feeding techniques. Never reach into the infeed or bypass a safety device to improve production.

Rigging requires conservative thinking because loads can move in arcs, shock-load systems, and overload anchors. The candidate should consider the weight of the piece, species, moisture, decay, rigging point, rope angle, bend radius, friction device, lowering zone, and communication. If the consequence of failure includes people, property, conductors, or the climber, the plan needs revision.

Tool control also includes shutdown and storage. Fuel should be handled away from ignition sources. Hot tools should not be refueled carelessly. Blades, chains, and moving parts should be stopped before clearing jams or making adjustments. Damaged tools should be tagged or removed so another worker does not unknowingly use them later.

Tool safety list:

• Inspect before use and remove unsafe tools from service.
• Use guards, brakes, emergency stops, and manufacturer procedures.
• Keep hands, clothing, ropes, and body parts away from moving parts.
• Establish drop zones, infeed zones, and communication signals.
• Match worker training to the tool and task.
• Reassess when wood is under tension, equipment shifts, or site exposure changes.

The strongest exam answer treats tools as part of the site plan. It is not enough to know what a chainsaw, chipper, or lowering device does. The candidate must decide whether it is inspected, appropriate, operated by a qualified worker, isolated from bystanders, and used in a way that protects the crew if something moves unexpectedly.