Stihl MS 381 Manual De Instrucciones página 66

English
Determine direction of fall with gunning
sight on shroud and fan housing
Your chainsaw has a gunning sight on
the shroud and fan housing. Use this
gunning sight.
Making Felling Notch
Position the saw so that the felling notch
is at a right angle to the direction you
want the tree to fall.
The sequence in which the felling notch
is made with a horizontal cut (bottom)
and angled cut (top) is defined in
country-specific regulations.
Make horizontal cut (bottom)
N
Make the angled cut (top) at about
N
45°- 60° to the horizontal cut.
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Check direction of fall
Position the saw in the horizontal
N
cut. The gunning sight must point in
the planned direction of fall – if
necessary, correct direction of fall
by re-cutting the felling notch.
Sapwood cuts
Sapwood cuts in long-fibered softwood
help prevent sapwood splintering when
the tree falls. Make cuts at both sides of
the trunk at same height as bottom of
felling notch to a depth of about 1/10 of
trunk diameter. On large diameter trees,
cut to no more than width of guide bar.
Do not make sapwood cuts if wood is
diseased.
Basic Information on Felling Cut
Stump dimensions
C
C E
The felling notch (C) determines the
direction of fall.
The hinge (D) helps control the falling
tree.
Width of hinge: about 1/10 of tree
–
diameter.
To reduce the risk of accidents, do
–
not cut through the hinge – you
could lose control of the direction of
fall.
Leave a broader hinge on rotten
–
trees.
1/10
D
G
MS 381