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Begin the felling cut slighty higher than the felling
notch and on the opposite side of the tree (fig.
22).
Then cut horizontally through towards the felling notch.
Apply the chain saw with its spikes directly behind the
uncut portion of wood and cut toward the notch (fig.
23). Leave approximately
1/10
of the tree diameter
uncut! This is the hinge (fig. 23). Do not cut through the
hinge because you could lose control of the direction
of the fall. Drive wedges into the felling cut where
necessary
to
control the direction of the fall. Wedges
should be of wood, light alloy or plastic
-
never of steel,
which can cause kickback and damage
to
the chain.
Always keep
to
the side of the falling tree. When the
tree starts
to
fall, shut
off
the engine, withdraw the bar
and walk away on the pre-planned escape path.
Watch out for falling limbs.
WARNING!
Be extremely careful with partially fallen trees which
are poorly supported.
When the tree hangs or for some other reason does
not fall completely, set the saw aside and pull the
tree down with a cable winch, block and tackle or
tractor.
If
you try to cut it down with your saw, you
may be injured.
Sectioning Method
WARNING!
Felling
a
tree that has a diameter greater than the
length
of
the guide bar requires use
of
either the
sectioning or plunge-cut method. These methods
are extremely dangerous because they involve the
use
of
the nose of the guide bar and can result in
kickback. Only properly trained professionals
should attempt these techniques.
For the sectioning method (fig. 24) make the first cut
with the guide bar fanning in toward the hinge. Then,
using the bumper spike as a pivot, reposition the saw
for the next cut. Avoid repositioning the saw more than
necessary. When repositioning for the next cut, keep
the guide bar fully engaged in the kerf
to
keep the
felling cut straight.
If
the saw begins
to
pinch, insert a
wedge
to
open the cut. On the last cut, do not cut
the hinge.
Plunge-Cut Method
Timber having
a
diamet
more
than
twice
the
length
of the guide bar reauires the use of the plunge-cut
method before making the felling cut.
First, cut a large, wide notch. Make a plunge cut in the
center
of
the notch.
The plunge cut is made with the guide bar nose. Begin
the plunge cut by applying the lower portion of the
guide bar nose
to
the tree at an angle (fig.
25).
Cut until
depth
of
the kerf is about the same as the width of the
guide bar (fig.
26).
Next, align the saw in the direction
in which the recess is
to
be cut. With the saw at full
throttle, insert the guide bar in the trunk (fig.
27).
Enlarge the plunge cut as shown in illustration (fig.
28)
26
27
28
13