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When cutting with the bottom part of the chain
the reactive force will pull the saw away from you
towards the wood you are cutting.
The saw will control the feeding speed and
sawdust will be directed towards you. (Fig. 19)
Fig. 19
○
When cutting with the upper part of the chain the
reactive force will push the saw towards you and
away from the wood you are cutting. (Fig. 20)
Fig. 20
○
There is a risk of kickback if the saw is pushed
far enough so that you begin to cut with the nose
of the bar.
The safest cutting method is to cut with the
bottom part of the chain. Sawing with the upper
part makes it much more diffi cult to control the
saw and increases the risk of kickback.
○
In case the chain locked, immediately release
the throttle lever.
If the throttle lever keeps rotating at high speed
with the chain locked, the clutch will overheat
causing trouble.
NOTE
Always keep the spiked bumper face to a tree,
because the chain may suddenly be drawn into
a tree.
Felling
Felling is more than cutting down a tree. You must
also bring it down as near to an intended place as
possible without damaging the tree or anything else.
Before felling a tree, carefully consider all conditions
which may eff ect the intended direction, such as:
Angle of the tree. Shape of the crown. Snow load
on the crown.
Wind conditions. Obstacles within tree range (e.g.,
other trees, power lines, roads, buildings, etc.).
WARNING
○
Always observe the general conditions of the
tree. Look for decay and rot in the trunk which
will make it more likely to snap and start to fall
before you expect it.
○
Look for dry branches, which may break and hit
you when you are working.
Always keep animals and people at least twice
the tree length away while felling. Clear away
shrubs and branches from around the tree.
Prepare a path of retreat away from the felling
direction.
Basic rules for felling trees
Normally the felling consists of two main cutting
operations, notching and making the felling cut.
Start making the upper notch cut on the side of the
tree facing the feeling direction. Look through the
kerf as you saw the lower cut so you do not saw
too deep into the trunk. The notch should be deep
enough to create a hinge of suffi cient width and
strength. The notch opening should be wide enough
to direct the fall of the tree as long as possible. Saw
the felling cut from the other side of the tree between
one and two inches (3–5 cm) above the edge of the
notch. (Fig. 21)
20
21
22
23
24
27
25
26
Fig. 21
24. Felling direction
25. 45° minimum notch opening
26. Hinge
27. Felling cut
Never saw completely through the trunk. Always
leave a hinge.
The hinge guides the tree. If the trunk is completely
cut through, you lose control over the felling
direction.
Insert a wedge or a felling lever in the cut well before
the tree becomes unstable and starts to move. This
will prevent the guide bar from binding in the felling
cut if you have misjudged the falling direction. Make
sure no people have come into the range of the
falling tree before you push it over.