Felling A Tree; Felling Back Cut; Limbing A Tree - Makita UC3030A Manual De Empleo Y De Seguridad

Felling a tree

When bucking and felling operations are being performed by
two or more persons, at the same time, the felling operation
should be separated from the bucking 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 utility company should be
notified immediately.
The chain saw operator should keep on the uphill side of the ter-
rain as the tree is likely to roll or slide downhill after it is felled.
A retreat path should be planned and cleared as necessary
before cuts are started. The retreat path should extend back and
diagonally to the rear of the expected line of fall as shown in Fig.
A. The next working place is at least 2 tree lengths away.
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 where felling cuts are to
be made.
Notching undercut
Make the notch 1/3 the diameter of the tree, perpendicular to
the direction of fall as shown in Fig. B. Make the lower hori zontal
notching cut first. This will help to avoid pinching of either the saw
chain or the guide bar when the second notch is being made.

Felling back cut

Make the felling back cut at least 2 inches (50.8 mm) higher than
the horizontal notching cut as shown in Fig. B. Keep the felling
back cut parallel to the horizontal notching cut. Make the felling
back cut so enough wood is teft 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 cut 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 it may rock back and bind the saw chain, stop cutting
before the felling back cut is complete and use wedges of wood,
plastic or aluminum 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.

Limbing a tree

Limbing is removing the branches from a fallen tree. When limb-
ing, leave larger lower limbs to support the log off the ground.
Remove the small limbs in one cut as shown in Fig. C. Branches
under tension should be cut from the bottom up to avoid binding
the chain saw.
2 tree lengths
= felling operation
A
Felling back cut
2 inches
B
LIMB CUT
Keep work off ground
Leave support limbs until log is cut
C
Cut from top (overbuck)
avoid cutting earth
D
Retreat
45°
45°
Direction
of fall
2 inches
Hinge
Notch
15