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Bar Tip Guard
An attachment that may be provided on the end of the
guide bar to prevent the chain at the end of the guide bar
from contacting the wood.
Bucking
The process of cross cutting a felled tree or log into
lengths.
Chain Brake
A device used to stop the chain saw.
Chain Saw Powerhead
A chain saw without the saw chain and guide bar.
Clutch
A mechanism for connecting and disconnecting a driven
member to and from a rotating source of power.
Drive Sprocket or Sprocket
The toothed part that drives the saw chain.
Felling
The process of cutting down a tree.
Felling Back Cut
The final cut in a tree felling operation made on the opposite
side of the tree from the notching undercut.
Front Handle
The support handle located at or toward the front of the
chain saw.
Front Handle Guard
A structural barrier between the front handle of a chain
saw and the guide bar, typically located close to the hand
position on the front handle and sometimes employed as
an activating lever for a chain brake.
Guide Bar
A solid railed structure that supports and guides the saw
chain.
Kickback
The backward or upward motion, or both of the guide bar
occurring when the saw chain near the nose of the top
area of the guide bar contacts any object such as a log or
branch, or when the wood closes in and pinches the saw
chain in the cut.
Kickback, Pinch
The rapid pushback of the saw which can occur when the
wood closes in and pinches the moving saw chain in the
cut along the top of the guide bar.
Kickback, Rotational
The rapid upward and backward motion of the saw which
can occur when the moving saw chain near the upper
portion of the tip of the guide bar contacts an object, such
as a log or branch.
Low-Kickback Chain
A chain that complies with the kickback performance
requirements of ANSI B175.1-1991 when tested on a
representative sample of chain saws.
Normal Cutting Position
Those positions assumed in performing the bucking and
felling cuts.
Notching Undercut
A notch cut in a tree that directs the tree’s fall.
Oiler Control
A system for oiling the guide bar and saw chain.
Rear Handle
The support handle located at or toward the rear of the
saw.
Reduced Kickback Guide Bar
A guide bar which has been demonstrated to reduce
kickback significantly.
Replacement Saw Chain
A chain that complies with the kickback performance
requirements of ANSI B175.1-1991 when tested with
specific chain saws. It may not meet the ANSI performance
requirements when used with other saws.
Saw Chain
A loop of chain having cutting teeth, that cut the wood, and
that is driven by the motor and is supported by the guide
bar.
Spiked Bumper (Spike)
The pointed tooth or teeth for use when felling or bucking
to pivot the saw and maintain position while sawing.
Switch
A device that when operated will complete or interrupt an
electrical power circuit to the motor of the chain saw.
Switch Linkage
The mechanism that transmits motion from a trigger to the
switch.
Switch Lockout
A movable stop that prevents the unintentional operation of
the switch until manually actuated.
GLOSSARY OF TERMS