Loading ...
Loading ...
Loading ...
L_
B.
12
TYPES OF CUTTING
A. BASIC CUTTING TECHNIQUE
1. IMPORTANT POINTS.
a. Cut wood only. Do not cut meta!, plastk_s,
rnasorm/,non-woodbuildingmatenals,et¢.Donot
useyour saw_opryorshove awaylimbs, rootsor
otherobjects.
b. Stop the saw if the chain strikes a foreign
object. Inspect ",heunit and repair or replace
parts asnecessary.
c. Keep the Chain OUtof dirt and sand.Even a
smaitamountofdirtwillquicklydulla chainand
thus,increasethepossibilityofkickback.
KICKBACK WARNING
Kickback canoccurwhen the movingchain contactsan
ob]ectat tlte-upperportion of the tip orthe guide baror
when _hewood closes in and pinches thesawchain in
the cut.Contact at the upper portion of the tip of the
guide bar claShcausethe chainto diginto theobject and
stop the chain fora_ instant. The result is a lightning
fast, reverse reaction which kicks the guide bar upand
back toward the operator. If the saw chain ispinched
along the top of the guide bar, the guide bar can be
driven rapidly backtoward theoperator. Eitherofthese
reactions can cause loss of saw control whichcan
result in serious injury.
2. UNDERSTAND REACTIVE FORCES
Pincb-Kickbackand Pul_-Inoccur when the chain
•is suddenly stopped bybeing pinched, caught, or
by contacting a foreign object in the wood, This
r_..sultsin areversalofthechainforceusedtocutwood
at_l causesthesaw_omove intheopposite directionof
chain rotati0n.Eitherreactioncanresu{tinlossofc0n-
tmtand Doss_teseriouspersonalinjury.
Pinch-KiCkback
--o_curswhenthe chain,ontopofthebarissuddenty
stopped whenthe top ofthebaris usedforcut_ng.
r_dty dd._ the =_.awstrai_, back towardthe
operator.
• P_Jli_ln--
-.can occur when the chain on the bottom of the
bar is suddenly stopped.
--pulls the sawrapidly forward.
3_
PROCEDURE ,
P_ce cuttingafewsmaillogsusingthek_lowingt_hni-
queto getthe'Teer'of usingyoursawbeforeyoubegina
major sawing operation.
_L Accelerate the engine to full throttle just before
entering the cut bysqueezingthe throttletrigger.
b. Begin cutting with the spur against the wood.
Figure16.
c. Keep the engine at fullthrottle the entiretime you
are cutting.
d. Allow the chain to cut for you; exert only light
downward pressuP_ ffyoUforce thecut, damageto
thebar,chain, orenginecan result.
e. Release the throttle trigger as soon as the cut is
completed, allowingtheenginetoidfe.Ifyourunthe
saw atfullthrottle withoutacuffingload,unneoessaty
wearcanoccurtothechain,bar,and engine.
f. Do not putpressure onthemat theend ofthecut
toavoidlosing controlwhen tl-_cutiscomplete.
g: Stop the engine before settingthe sawdownafter
cutting.
= =,lll=l
BEGINCUTTING WITH
THE SPURAGAINST
THE LOG
Figure 16-
TREE FELLING TECHNIQUES
1- PLAN YOUR SAWING OPERATION CARE-
FULLY IN ADVANCE
a. C_s._ _.e work area, Youneed aclear area at_
around the tree where you can have secure
footing.
b. Study the natural conditions that cancause
the tree tofall in a particular direction:
2.) TheLEAN ofthetree,
.3.} WEIGHTED with BRANCHES on one sfde.
4,} SurroundingTREES and OBSTACLES,
c. Look for decay and rot, Ifthe trunkis rotted,
itcoutdsnapand fall toward theoperator.
• i =u.=l i i . J= j == i
d. Check for broken or dead branches which
couldfall on yo'0whilecutting.
e. Maimsure there isenough roomforthetres to
fall Ma_r_n adis_eof_'_ _ee _-f_m
thenearestpersonor_her objects.Enginenoise
can drow_ outawam_ngcarl
f. Remove dirt, stones, loose bark, trolls,.
staples, and wire from the tree where cuts
g. Plan to stand on the uphill side when cut.
ttng on a siope.
h. Plan a clear retreat path to the rear and
diagonal tothe Ilne0f falLF_gure 17.
Loading ...
Loading ...
Loading ...