Dolmar Gasoline Chain Saws PS-34 - Manuel (Page 14)

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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 por-
tion 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.
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Plunge-Cut Method
Timber having a diameter more than twice the length of
the guide bar requires 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).
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