Plunge Cutting; Selecting The Appropriate Felling Cut - Stihl MSA 120 C Manual De Instrucciones

12 Operating the Saw
E Felling cut
The tree is felled with the felling cut. The felling 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.

12.4.5 Plunge cutting

Plunge cutting is a technique required for felling.
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► 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
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– 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 Instruction Manual.
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1 Normal tree
A normal tree is vertical and has an even crown.
2 Leaner
A leaner stands at an angle and the crown faces in the
direction of fall.
12.4.7 Felling normal, small diameter tree
A normal tree is felled with a felling cut and stabilizing strap.
This felling cut must be performed if the tree diameter is less
than the guide bar's length.
► Shout a warning.
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