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TYPES
OF CUTTING
III I
--
i
IIIIIIIIII III
I
A, BASIC
CUTTING
TECHNIQUE
JIIIIIIII IIIIIII III IIIII II
III
2.
UNDERSTAND
REACTIVE
FORCES
1. IMPORTANT
POINTS
a. Cut wood only, Do not cut metal, plastics,
masonry,non-weodbuilding matedals, etc.Do not
use yoursaw to pryor shoveaway limbs, rootsor
other objects.
b. Stop the sawif the chainstrikes a foreign object.
Inspect the saw and repair or replace parts ds
necessary.
c. Keep the chain out of dirt and sand. Even a
small amount of dirt willquickly dull a chain and
thus increase the possibility of kickback.
• k KICKBACK WARNING
Kickbackcan occur when the movingchain contacts
an object atthe upper portionofthe tipoftheguidebar
or when the wood closes in and pinches the saw chain
in the cut. Con tact at the upper portion of the tip of the
guidebarcan causethechain todig intotheobjectand
stop the chain for an instant. The result is a lightning
fast, reverse reaction which kicksthe guide bar up and
back toward the operator, ff the saw chain is pinched
along the .top of the guide bar, the guide bar can be
driven rapidly back toward the operator. Either of
these reactions can cause loss of saw control which
can result in serious inju[y.
,,J,,,,
,
B_GIN
CLI'_J;ING WITH
.
.
THE BOTTOM
OF THE
SAW AGAINST
THE LOG.
Figure 18
Pinch-Kickback and Pull-In occur when the chain
is suddenly stopped by being pinched, caught, or
by contacting a foreign object in the wood, This
resultsin a reversa! of thechain forceused tocutwood
and causesthesaw tomove in theoppose direction of
chainrotation.Eitherreactioncan resultin loss 0fcon-
trotand possiblesedous injury.
;, Pinch-Kickback-
--occurs
when the chain, on top of the bar is
suddenlystopped when the top of the bar isused
for cutting.
--rapid/y drives the saw straight back toward the
operator.
• Pull-In
--can
occur when the chain on the bottomof the
bar is suddenly stopped.
--pulls the saw rapidlyforward.
3. PROCEDURE
Practicecutting a few smalllogsusingthe fo!lowing t echni-
que toget the "feel" of usingyour saw beforeyoubegina
major sawing operation.
a. Acceferatetheengineto
fullthrottlejust
before
entering the cut bysqueezing the throttletrigger.
b. Begin cutting with the saw frame against the log.
Figure 18.
c, Keep the engine at full throttle the entire time you
are cutting,
d. Allow the chain to cut for you; exert only light
downward pressure, if you force the cut, damage to
the bar.chain, or en.qinecan result.
e, Release the th,'_Ule trigger assoon _s th_ cut is
completed, al/owtngthe engine to idle.If you runthe
saw at fullthrottlewithout a cutting load, unnecessary
wear can occurto the chain, bar, an.dengine.
f. Do not put pressureon tllesawat the end of the cut
to avoidlosingcontrolwhen the cut is complete.
g. Stopthe engine before setting the saw down after
cutting.
B.
TREE
FELLING
TECHNIQUES
1. PLAN
YOUR SAWING OPERATION
CARE-
FULLY
IN ADVANCE
a. Clear the work area. You need a clear area all
around the.tree where you can have secure :
foot_r_g.
b. Study the natural conditions that can cause
the tree to fall in a particuta=:direction,
1.) The WIND directionand speed.
2.) The LEAN of thetree.
3 ) WEIGI-WED with BRANCHES on one side.
4.) Surrounding TREES and OBSTACLES,
c
Lookfordecayand rot. Ifthetrunkisrotted, itcan
snap and fal!towardtheoperator,
d. Check for broken or dead branches whichcan
fall on you while cutting.
e. Make sure thereis enough room for thetree to
fall. Maintainadistanceof 2V2treelengths fromthe
neare_ perSonorother objects.Engine noisecan
drownout a warning call.
f
Remove
dirt, stones,
loose bark,
nails,
staples, and wire from the tree where cuts
are to be made.
g. Ptan to stand on the up-hill side when cut-
ting on a slope.
h. Plan a clear retreat path to the rear and
diagonal to the line of fall. Figure _9.
12
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