Bosch AKE 30 S Bedienungsanleitung Seite 24

Cutting Logs
Observe the following safety instructions:
Support logs so that the face sides at the cut
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do not close in against each other, which would re-
sult in the chain being jammed or pinched.
Position and set short logs safely prior to sawing.
Saw only wood or wooden objects. When sawing, al-
ways take care to avoid hitting stones, nails, etc., as
these could be thrown up or cause damage to the
chain or serious injury to the operator or bystanders.
Keep a running saw clear of wire fencing or the
ground.
Use of the saw to thin out branches or bushes is not
approved.
Length cuts must be carried out with care, as lever-
age with the gripping teeth 11 is not possible. Saw at
a flat angle to avoid kickback.
When working on a slope, operate above or to the
side of the trunk or laying tree.
Be careful not to trip over tree stumps, branches,
roots, etc.
Cutting Wood under Tension
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There is a high risk of accidents when sawing wood,
branch or trees under tension. Be extremely careful.
Leave saw jobs like these to professionals.
When sawing logs supported on both ends, start the
cut from above (Y) about 1/3 of the diameter into the
log and then finish the cut (Z) from below, in order to
avoid splitting of the log or jamming of the saw.
Avoid contact of the chain saw with the ground.
When sawing logs supported on only one end, start
the cut from below (Y) about 1/3 of the diameter into
the log and finish the cut from above (Z), in order to
avoid log splitting or jamming of the chain saw.
Felling Trees
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Always wear hard hat to protect head
against falling branches.
The chain saw can only be used to fell
trees smaller in diameter than the length of
the chain bar.
Secure work area. Ensure no persons or ani-
mals are in the vicinity of the falling tree.
Never attempt to free a jammed saw with the mo-
tor running. Use wooden wedges to free chain
and chain bar.
When cutting and felling operations are being per-
formed by two or more persons, at the same time,
the felling operations should be separated from the
cutting operation 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 any utility line, the
company should be notified immediately.
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The chain saw operator should keep on the uphill
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 diagonally 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 falls as Make the lower horizontal notching
cut first. This will help to avoid pinching either 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 notching cut.
Keep the felling back cut parallel to the horizontal
notching cut. Make the felling back cut so enough
wood is left to act as a hinge. The hinge wood keeps
the tree from twisting and falling in the wrong direc-
tion. Do not cut through the hinge.
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 desired direction or it may rock back and
bind the saw chain, stop cutting before the felling
back cut is complete and use wedges of wood, plas-
tic 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 over-
head limbs falling and watch your footing.
To complete the felling operation, drive a wedge (Z)
into the horizontal cut.
Beware of falling branches when the tree starts to
move.
Limbing a Tree
Limbing is removing the branches from a fallen
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tree. When limbing leave larger lower limbs to sup-
port the log off the ground. Remove the small limbs
in one cut as illustrated. Branches under tension
should be cut from the bottom up to avoid binding
the chain saw.
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