Ryobi RY40502 User Manual download pdf (Page 11)

11 - English

GLOSSARY OF TERMS

Bucking

The process of cross cutting a felled tree or log

into lengths.

Chain Saw Powerhead

A chain saw without the saw chain and guide bar.

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 Hand 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.

Front Handle

The support handle located at or toward the front

of the chain saw. This handle is for the left hand.

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.

Lock-out button

A movable stop that prevents the unintentional

operation of the switch until manually actuated.

Low-Kickback Chain

A chain that complies with the kickback

performance requirements of ANSI B175.1 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.

Rear Handle

The support handle located at or toward the rear

of the saw. It normally contains the switch trigger.

This handle is for the right hand.

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 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.

Springpole

A small tree (sapling) or limb that is bent or trapped

under tension. It may “spring back” rapidly when

cut, causing a dangerous situation.

Switch Trigger

A device that when operated will complete or

interrupt an electrical power circuit to the motor

of the chain saw.

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Ryobi RY40502 User Manual Page 11

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