Stihl MSA 220 C Instruction Manual page 46

English
► If the limb is under tension: Make the relieving
cut (1) at the compression side and then per‐
form bucking cut (2) from the tension side.
11.4 Felling
11.4.1 Determining direction of fall and
escape path
► Determine direction of fall so that the area in
which the tree falls is clear.
► Observe the following points when planning
escape path (B):
– Escape path (B) at an angle of 45° to direc‐
tion of fall (A).
– No obstacles on the escape path (B).
– The top of the tree can be observed.
– If the escape path (B) is on a slope, it must
be parallel to the slope.
11.4.2 Preparing work area at base of tree
► Remove obstacles from work area at tree
base.
► Remove growth from tree base.
► If the tree has large, healthy buttress roots:
Make vertical cut first and then a horizontal
cut, and remove the resulting piece.
46
11.4.3 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.
11.4.4 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.
11 Operating the Saw
C E
1/10
Ø
G
90°
0458-795-9821-B