Cutting The Felling Notch; Plunge Cutting - Stihl MSA 220 C Manual De Instrucciones

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13.4.3 Basic information on felling cut
C
C Felling notch
The felling notch determines the direction of
fall.
D Hinge
The hinge helps control the falling tree. The
width of the hinge is 1/10 of the trunk diame‐
ter.
E Felling cut
The tree is felled with the felling cut. The fell‐
ing cut is 1/10 of the trunk diameter (at least 3
cm) above the bottom of the felling notch.
F Stabilizing strap
The stabilizing strap supports the tree and
helps prevent it from falling prematurely. The
width of the stabilizing strap is 1/10 to 1/5 of
the trunk diameter.
G Holding strap
The holding strap supports the tree and helps
prevent it from falling prematurely. The width
of the holding strap is 1/10 to 1/5 of the trunk
diameter.
13.4.4

Cutting the felling notch

The felling notch determines the direction in
which the tree falls. Country-specific standards
for making the felling notch must be observed.
► Position the saw so that the felling notch is an
right angles to the direction of fall and the saw
is close to the ground.
► Make the horizontal cut.
► Make the angle cut at 45° to the horizontal cut.
50
C E
1/10
Ø
G
90°
► If the wood is sound and long-fibered:
Observe the following points when making
sapwood cuts:
– The cuts must be the same at both sides.
– The cuts must be at the same height as the
bottom of the felling notch.
– The width of the cuts is 1/10 of the trunk
diameter.
The trunk does not splinter when the tree falls.
13.4.5

Plunge cutting

Plunge cutting is a technique required for felling.
1
3
2
► Begin cut with the lower portion of the guide
bar nose – with chain running at full speed.
► Cut until depth of kerf is twice the width of the
guide bar.
► Swing the saw into plunge-cutting position.
► Perform the plunge cut.
13.4.6 Selecting the Appropriate Felling Cut
The choice of appropriate felling cut depends on
the following conditions:
– The natural inclination of the tree
– The tree's branch formation
– Damage to the tree
– The tree's state of health
– If there is snow on the tree: the snow load
– The direction of slope
– Wind direction and speed
– Nearby trees, if any
There are different features of these conditions.
Only two features are described in this Instruc‐
tion Manual.
13 Operating the Saw
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