Bosch AKE 30-19 S Manual Original página 34

OBJ_BUCH-1238-001.book Page 34 Friday, April 30, 2010 9:39 AM
34 | English
The chain saw may only be used to fell trees
smaller in diameter than the length of the
chain bar.
Secure the work area. Ensure no persons or
animals are in the vicinity of the falling tree
( ).
Never attempt to free a jammed chain saw
with the motor running. Use wooden wedg-
es to free a jammed chain saw.
When cutting and felling operations are being
performed by two or more persons at the same
time, the felling operations should be separated
from the cutting operations by a distance of at
least twice the height of the tree being felled.
Trees should not be felled in a manner that
would endanger any person, strike any utility
line or cause any property damage. If the tree
does make contact with a utility line, the compa-
ny should be notified immediately.
The chain saw operator should keep on the up-
hill side of the terrain as the tree is likely to roll
or slide downhill after it is felled.
An escape path ( ) should be planned and
cleared as necessary before cuts are started.
The escape path should extend back and diago-
nally to the rear of the expected line of fall.
Before felling is started, consider the natural
lean of the tree, the location of larger branches
and the wind direction to judge which way the
tree will fall.
Remove dirt, stones, loose bark, nails, staples,
and wire from the tree.
Notching undercut: Make the notch (X – W) 1/3
the diameter of the tree, perpendicular to the di-
rection of fall. Make the lower horizontal notch-
ing cut first. This will help to avoid pinching ei-
ther the saw chain or the guide bar when the
second notch is being made.
Felling back-cut: Make the felling back-cut (Y)
at least 50 mm higher than the horizontal notch-
ing cut. Carry out the felling back-cut parallel to
the horizontal notching cut. Make the felling
back-cut so that enough wood is left to act as a
hinge. The hinge-wood keeps the tree from
twisting and falling in the wrong direction. Do
not cut through the hinge.
F 016 L70 667 | (30.4.10)
As the felling gets close to the hinge, the tree
should begin to fall. If there is any chance that
the tree may not fall in the desired direction or
may rock back and bind the saw chain, stop cut-
ting before the felling back-cut is complete and
use wedges of wood, plastic or aluminium to
open the cut and drop the tree along the desired
line of fall.
When the tree begins to fall, remove the chain
saw from the cut, stop the motor, put the chain
saw down, then use the retreat path planned.
Be alert for overhead limbs falling and watch
your footing.
Drive a wedge (Z) into the horizontal cut to
make the tree fall.
When the tree begins to fall, leave the danger ar-
ea via the retreat path planned. Be alert for over-
head limbs falling and watch your footing.
Limbing a Tree (see figure K)
Limbing is removing the branches from a fallen
tree. When limbing, leave larger lower limbs to
support the log off the ground. Remove the
small limbs in one cut as illustrated in the figure.
Branches under tension should be cut from the
bottom up to avoid binding the chain saw.
Bucking a Log (see figures L – O)
Bucking is cutting a log into lengths. It is impor-
tant to make sure your footing is firm and your
weight is evenly distributed on both feet. When
possible, the log should be raised and support-
ed by the use of limbs, logs or chocks. Follow
the simple directions for easy cutting.
When the log is supported along its entire
length, it is cut from the top (overbuck).
When the log is supported on one end, cut 1/3
the diameter from the underside (underbuck).
Then make the finished cut by overbucking to
meet the first cut.
When the log is supported on both ends, cut 1/3
the diameter from the top overbuck. Then make
the finished cut by underbucking the lower 2/3
to meet the first cut.
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