Bosch AKE 45 S 0.600.834.700 - Инструкция по эксплуатации - Страница 28

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F 016 L81 408 | (18.11.15)

Bosch Power Tools

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 or-

der 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 mo-
tor 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 per-
son, 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.

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 neces-

sary 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 diame-

ter 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 sec-
ond 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 fall-
ing 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 de-
sired direction or may rock back and bind the saw chain, stop 
cutting before the felling back-cut is complete and use wedg-
es 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 re-
treat 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 re-
treat 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 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 M –P)

Bucking is cutting a log into lengths. It is important to make 
sure your footing is firm and your weight is evenly distributed 
on both feet. When possible, the log should be raised and sup-
ported 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 under-
bucking the lower 2/3 to meet the first cut.

When bucking on a slope, always stand on the uphill side of 
the log. When “cutting through”, release the cutting pressure 
near the end of the cut without relaxing your grip on the chain 
saw handles in order to maintain complete control. Don’t let 
the chain contact the ground. After completing the cut, wait 
for the saw chain to stop before you move the chain saw. Al-
ways stop the chain saw motor before moving from tree to 
tree.

OBJ_BUCH-2245-002.book  Page 28  Wednesday, November 18, 2015  12:45 PM