GASOLINE CHAIN SAW
18
1. Notched Undercut. This cut determines the direction that the tree will
fall. It should be made on the side of the tree facing the felling direction.
Cut a notch about 1/3 the diameter of the trunk in the side of the tree.
Make the notch cuts so they intersect ata right angle to the line of fall.
This notch should be cleaned out to leave a straight line. To keep the
weight of the wood off the saw, always make the lower cut of the notch
before the upper cut.
Planned
Line of
Fall
135º From
Planned
Line of Fall
Path of
Safe
Retreat
Back
Cut 2”
(5cm)
Notch
Approx. 1/3
Diameter
of Trunk
Hinge 2”(5cm) or
1/10 Diameter
Fig. 17
Fig. 18
2. Felling Back Cut. This cut fells the tree. Make the back cut level and
horizontal, and at a minimum of 5 cm above the horizontal cut of the
notch (Fig 18). If the diameter of the tree is greater than the length of the
guide bar, make two cuts as shown (Fig. 19). When the felling cut gets
close to the hinge, the tree should begin to fall ( Fig. 20).
If there is any chance the tree may not fall in the desired direction or if it
may rock back and bind the saw chain, stop cutting before the felling cut
is complete and use wedges of wood or plastic to open the cut and drop
the tree along its desired line of fall (Fig. 21).
18"
/450mm
GASOLINE CHAIN SA
W
18"
/450mm
GASOLINE CHAIN SA
W
Wedge
Hinge
Back
Cut
Fig. 19
Fig. 20
Fig. 21