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TYPES OF CUTTING
III I -- i IIIIIIIIIIIII I
A, BASIC CUTTING TECHNIQUE
JIIIIIIIIIIIIIII III IIIII II III
2. UNDERSTAND REACTIVE FORCES
1. IMPORTANT POINTS
a. Cut wood only, Do not cut metal, plastics,
masonry,non-weodbuildingmatedals,etc.Do not
useyoursawtopryorshoveawaylimbs, rootsor
otherobjects.
b. Stop thesawif thechainstrikesaforeign object.
Inspect the saw and repairor replace parts ds
necessary.
c. Keep the chain out of dirt and sand. Even a
small amount ofdirtwillquicklydull a chain and
thus increase the possibility of kickback.
• k KICKBACK WARNING
Kickbackcan occur when the movingchain contacts
anobject atthe upper portionofthe tipoftheguidebar
orwhen the wood closes in andpinches the saw chain
in the cut. Contact at the upper portion ofthetip of the
guidebarcan causethechain todig intotheobjectand
stop the chain for an instant. The result isa lightning
fast, reverse reaction which kickstheguide bar upand
back toward the operator, ff thesaw chain ispinched
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 thechain
issuddenly stopped by being pinched, caught, or
by contacting a foreign object in the wood, This
resultsinareversa!ofthechainforceusedtocutwood
andcausesthesawtomove intheoppose directionof
chainrotation.Eitherreactioncanresultinloss 0fcon-
trotandpossiblesedousinjury.
;,Pinch-Kickback-
--occurs when the chain, on top of the bar is
suddenlystoppedwhen the topof the bar isused
forcutting.
--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 sawrapidlyforward.
3. PROCEDURE
Practicecuttinga fewsmalllogsusingthefo!lowingtechni-
que togetthe"feel" ofusingyour sawbeforeyoubegina
major sawing operation.
a. Acceferatetheengineto fullthrottlejust before
entering thecut 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, ifyou force thecut,damageto
thebar.chain,or en.qinecan result.
e, Release the th,'_Ule trigger assoon _sth_ cut is
completed, al/owtngthe engine toidle.Ifyourunthe
sawat fullthrottlewithouta cuttingload, unnecessary
wear canoccurto thechain, bar,an.dengine.
f. Do not put pressureon tllesawat the end ofthecut
toavoidlosingcontrolwhen the cutis complete.
g. Stopthe engine before setting the sawdown 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 ofthetree.
3 ) WEIGI-WED withBRANCHES on one side.
4.) SurroundingTREES and OBSTACLES,
c Lookfordecayand rot.Ifthetrunkisrotted, itcan
snap and fal!towardtheoperator,
d. Check for broken or dead branches whichcan
fallon youwhilecutting.
e. Makesure thereis enough room forthetree to
fall.Maintainadistanceof 2V2treelengthsfromthe
neare_ perSonorother objects.Enginenoisecan
drownout a warningcall.
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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