Stihl MSA 120 C Instruction Manual page 29

12 Operating the Saw
► 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 same height as bottom of felling
notch.
– The width of the cuts is 1/10 of the trunk diameter.
The trunk does not splinter when the tree falls.
12.4.4 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.
E Felling cut
The tree is felled with the felling cut.
0458-716-0121-B
C E
1/10
D
G
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.
12.4.5 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
12.4.6 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
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