1 Mechanical Timber Harvesting Handbook
Key Safety Information
SHOT CONE ZONE SHOT CONE ZONE
WARNING: There is risk of serious injury or death to the
machine operator, ground personnel and bystanders from
chain shot. A Chain Shot Event (CSE) occurs when a piece or
pieces of cutting chain from the end of a broken saw chain in
mechanized timber harvesting or processing is ejected at a
high velocity. Chain shot typically originates near the drive end
of the cutting system but can also originate from the guide bar
tip area. Saw chain pieces usually travel in the cutting plane of
the guide bar, but can deviate to either side (see illustration
below). Although the "Shot Cone Zone" reflects the most likely
chain shot path, deflections can occur, substantially expanding
where chain pieces may travel. To minimize risk, operators
should keep out of the Shot Cone Zone, ground personnel and
bystanders should be at least 230 feet away from cutting
operations and out of the Shot Cone Zone.
Chain Shot
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