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Open-face technique
A = felling notch - determines the
direction of the fall
For an open-face cut:
:
Properly place felling notch
perpendicular to the line of fall,
close to the ground
:
Cut down at app. 50-degree angle
to a depth of app.1/5 to 1/4 of the
trunk diameter
:
Make second cut from below at app.
40 degree angle
:
Remove resulting 90-degree piece
MSE 220
Making sapwood cuts
:
For medium sized or larger trees
make cuts at both sides of the trunk,
:
at same height as subsequent
felling cut
:
Cut to no more than width of guide
bar
This is especially important in
softwood in summer - it helps
prevent sapwood splintering when
the tree falls.
English / USA
B
B = Felling cut
Conventional and open-face technique:
:
Begin 1 to 2 inches (2,5 to 5 cm)
higher than centre of felling notch
:
Cut horizontally towards the felling
notch
:
Leave approx.1/10 of diameter
uncut. This is the hinge
:
Do not cut through the hinge - you
could lose control of the direction of
the fall
Drive wedges into the felling cut where
necessary to control the fall.
!
Warning!
If the tip of the bar contacts a wedge, it
may cause kickback. Wedges should be
of wood or plastic - never steel, which
can damage the chain.
B
19
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