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TYPES OF CUTTING
A. :BASIC CUTTING TECHNIQUE
1. IMPORTANT POINTS.
.
a. Cut wood .only. :Do not cut metal, plastics,
• masonry, non-wood, building materials;etc.
b. Stop the saw if the chain strikes a foreign
._ object. Inspect the Unitand repair or replace
parts as necessary.
c.: Keep the chain out of dirt and sand. Even a
._ smallamountofdirtwillquicklydullachainand
...... thus, increase the possibility of kickback:
UNDERSTAND REACTIVE FORCES
Pushback andPull-in occur when the chain is
suddenly stopped by being pinched, caught,
Or by contacting a foreign object in the wood.
i,This results in a reversal of the chain force used
.to.cut wood and causes thesaw to move in the op-
p0site direction of chain rotation, resulting in loss
ofcontrot and possible serious personal injury.
• Pushback:
_occurs when the chain, on top of the bar, is
" suddentystopped when the top of the bar is
.... used for cutting.
--drives the saw straight -back toward the
operator, possibly causing loss of saw con-
trol.
To avoid Pushback:
a. Be extremely aware of situations or
obstructions that may cause material to pinch
the top ofor otherwise stop the chain.
b. Do not cut more than one log at a time.
BEGINCUTTING WITH THE SAW ....
• Pull-in:
--occurs when the chain on the bottom of the
bar issuddenly stopped.
-- occurs when the saw housing is not held sec-
urely against the tree or limb and/or when the
cut isnot begun with the motor running.
--pulls the saw forward, and could cause the
operator to lose control.
To avoid Pull-in:
.... a. Always begin cutting with the motor run-
ning and the saw housing against the
wood.
b; Use wedges made of plastic, wood, or light
alloy (never of steel or iron) to hold the cut
open.
.... i. CAU.TION:Do!.not ._staiLthe chain in the cut.
,, _This will overheat the:motor and cause damage.
3. PROCEDURE
Practice Cutting a few small logs using the follow-
ing.technique to get the "feel" of using your saw
before you begin a major sawing operation.
a. Assume the proper cutting stance de-
scribed in.the section ,Controlling Kickback"--
firm grip on front and rear handles, weight
evenly balanced on both feet, and body slightly
to the left side of the saw.
b. Make sure the extension cord is com-
pletely away from the saw and your body
sothe cord cannot be cut or become wrap-
'c. Do not:twist the sawas the bar is withdrawn pedaround your,feet or.legs.
from an under-cut, c. Press the trigger to start:the chain moving
befor e beginning the cut.
d. Begin cutting with the saw. frame up
.against the log. Figure 23.,
e. Allow the chain.to cut for. you. Exert only
light downward pressure. If you force the cut,
...... damage,to the bar, chain or motor canresult,
f._ Do not put:pressure on the saw at th'e end
._.::.of thecuttoav0id losing controlwhen the cut
iscomptete. ".......
g. _Release the,Trigger Switch as soon as the
: cut iscompleted. .
h. Unplug the unit after each cutting opera-
tion.
B. TREE-FELLING TECHNIQUES
1. PLAN YOUR SAWING OPERATIONCARE-
_,':_;_FULLY IN ADVANCE
a.. Clear the work area. You need a clear area alld.
around the tree where you can have secure
footing.
b. Study the natural conditions that can cause
the tree to fall in a particular direction.
1:) TheWIND direction and speed
2.) The LEAN of the tree
3.) WEIGHTED with BRANCHES on one side
4.) Surrounding TREES and OBSTACLES
c. Look for decay and rot. If the trunk is rotted,
it could snap and fail toward the operator.
d. Check for broken or dead branches which
could fall on you while cutting. •
e. Make surethere is enough room forthetree
to fail. Maintaining a distance of 2V2 tree
lengths from the nearest person or other ob-
jects. Motor noise may drown out warning call.
f. Remove dirt, stones, loose bark, nails,
staples, and wire from the tree where cuts
areto be made,
g. Plan 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 24. 13
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