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Bosch AKE 30 LI Original Instructions Manual page 14

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OBJ_BUCH-1275-003.book Page 28 Tuesday, October 4, 2011 9:21 AM
28 | English
Cutting Logs (see figures G and J)
When cutting logs, observe the following safe-
ty instructions:
Support logs so that the face sides at the cut
do not close in against each other, which
would result in the chain being jammed.
Position and set short logs safely before saw-
ing.
Saw only wood or wooden objects. When
sawing, always take care to avoid hitting
stones, nails, etc., as these could be thrown
up, could cause damage to the chain, or could
result in serious injury to the operator or by-
standers.
Keep a running chain 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 particu-
lar care, as leverage with the gripping teeth 8
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 (see figure J)
Be extremely careful when sawing wood,
branches or trees under tension. Leave
saw jobs like these to trained profession-
als. There is a high risk of accidents.
When sawing logs supported on both ends,
start the cut from above (Y) about one third of
the diameter into the log and then finish the
cut at the same spot from below (Z), in order
to avoid splitting of the log or jamming of the
saw. Avoid contact of the saw chain with the
ground.
When sawing logs supported on only one end,
start the cut from below (Y) about one third of
the diameter into the log and then finish the
cut at the same spot from above (Z), in order
to avoid splitting of the log or jamming of the
saw.
Felling Trees (see figure K)
Always wear hard hat to protect head
against falling branches.
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
wedges 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 company should be notified
immediately.
F 016 L70 758 | (4.10.11)
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 diag-
onally to the rear of the expected line of fall.
Before felling is started, consider the natural
lean of the tree, the location of larger branch-
es and the wind direction to judge which way
the tree will fall.
Remove dirt, stones, loose bark, nails, sta-
ples, and wire from the tree.
Notching undercut: Make the notch (X – W)
1/3 the diameter of the tree, perpendicular to
the direction of fall. 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. 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.
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
cutting 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
area via the retreat path planned. Be alert for
overhead limbs falling and watch your footing.
Limbing a Tree (see figure L)
Limbing is removing the branches from a fall-
en tree. When limbing, leave larger lower
limbs to support the log off the ground. Re-
move 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 M – P)
Bucking is cutting a log into lengths. It is im-
portant to make sure your footing is firm and
your weight is evenly distributed on both feet.
When possible, the log should be raised and
supported 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 (under-
buck). Then make the finished cut by over-
bucking 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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