7
CHAIN SAW NAMES AND TERMS
•
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 cut.
•
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 ona
representative sample of chain saws.)
•
Normal Cutting Position
- Those positions assumed in
performing the bucking and felling cuts.
•
Reduced Kickback Guide Bar
- A guide bar which has been
demonstrated to reduce kickback significantly.
•
Replacement Saw Chain
- A chain that complies with 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.
•
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.
479970-00 LP1000 9/14/05 1:00 PM Page 7
