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Kickback is the term to describe the unexpected upward motion of the guide bar. Kickback occurs when the end portion of the nose of the bar (the kickback zone) strikes an object and the chain momentarily snags, or is pinched. CSA Z62.3-11 (R2016) defines kickback as:
Kickback – the rapid upward motion ofh te guide bar that can occur when the saw chain, near the nose (tip) of the top area of the guide bar, contacts an object such as a log or branch (rotational kickback), or the backwardm otion that can occur when the wood closes in and pinches hte saw chain in the cut (pinch kickback).
The most common and probably most violent kickback occurs when contact is made, either accidentally or intentionally, in this "kickback zone." In some cases the blade tip may move upward and back toward the operator who could suffer a very serious or fatal injury.
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