26 –
English
WORKING TECHNIQUES
Next make the bottom cut so that it
fi
nishes exactly at the end
of the top cut.
The directional cuts should run 1/4 of the diameter through
the trunk and the angle between the top cut and bottom cut
should be 45
°
.
The line where the two cuts meet is called the directional cut
line. This line should be perfectly horizontal and at right
angles (90
°
) to the chosen felling direction.
Felling cut
The felling cut is made from the opposite side of the tree and
it must be perfectly horizontal. Stand on the left side of the
tree and cut on the pull stroke.
Make the felling cut about 3-5 cm (1.5-2 inches) above the
bottom directional cut.
Set the spike bumper (if one is
fi
tted) just behind the felling
hinge. Use full throttle and bring the bar and chain slowly into
the tree. Make sure the tree does not start to move in the
opposite direction to your intended felling direction. Drive a
wedge or breaking bar into the cut as soon as it is deep
enough.
Finish the felling cut parallel with the directional cut line so
that the distance between them is at least 1/10 of the trunk
diameter. The uncut section of the trunk is called the felling
hinge.
The felling hinge controls the direction that the tree falls in.
All control over the felling direction is lost if the felling hinge is
too narrow or non-existent, or if the directional cuts and felling
cut are badly placed.
When the felling cut and directional cut are complete the tree
should start to fall by itself or with the aid of a felling wedge or
breaking bar.
