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Common Cutting Techniques
(Fig. A, P, Q, U, V, W)
Felling
The process of cutting down a tree. Be sure battery is fully
charged before felling a tree so you can finish on a single
charge. Do not fell trees in high wind conditions.
WARNING: Felling can result in injury. It should only be
performed by a trained person.
•
A retreat path should be planned and cleared as necessary
before cuts are started. The retreat path should extend
back and diagonally to the rear of the expected line of fall.
(Figure U)
Fig. U
45°
•
Before felling is started, consider the natural lean of the
tree, the location of larger branches and the wind direction
to judge which way the tree will fall. Have wedges (wood,
plastic or aluminum) and a heavy mallet handy. Remove
dirt, stones, loose bark, nails, staples, and wire from the tree
where the felling cuts are to be made.
•
Notching Undercut - Make the notch 1/3 of the diameter of
the tree, perpendicular to the direction of the fall. Make the
lower horizontal notching cut first. This will help to avoid
pinching of either the saw chain or the guide bar when the
second notch cut is being made (Figure V).
•
Felling Back Cut - Make the felling back cut at least 51 mm
higher than the horizontal notching cut. Keep the felling
back cut parallel to the horizontal notching cut. Make the
felling back cut so enough wood is left to act as a hinge. The
hinge wood keeps the tree from twisting and falling in the
wrong direction. Do not cut through the hinge (Figure V).
•
As the felling cut gets close to the hinge the tree should
begin to fall. If there is any chance that the tree may not fall
in the desired direction or it may rock back and bind the
saw chain, stop cutting before the felling cut is complete
and use wedges to open the cut and drop the tree along
the desired line of fall. When the tree begins to fall remove
the chain saw from the cut, stop the motor, put the chain
saw down, then use the retreat path planned. Be alert for
overhead limbs falling and watch your footing.
RETREAT
DIRECTION OF
FALL
TREE
Fig. V
DIRECTION OF FALL
NOTCH
Limbing
Removing the branches from a fallen tree. When limbing, leave
larger lower limbs to support the log off the ground. Remove
the small limbs in one cut. Branches under tension should be
cut from the bottom of the branch towards the top to avoid
binding the chain saw as shown in Figure P. Trim limbs from
opposite side keeping tree stem between you and saw. Never
make cuts with saw between your legs or straddle the limb to
be cut.
Bucking
WARNING: Recommend that first time users should
practice cutting on a saw horse.
Cutting a felled tree or log into lengths. How you should
cut depends on how the log is supported. Use a saw horse
(Figure Q) whenever possible.
•
Always start a cut with the chain running at full speed.
•
Place the bottom spike
of the initial cut as shown in Figure W.
•
Turn the chain saw on then rotate the chain and bar down
into the tree, using the spike as a hinge.
•
Once the chain saw gets to a 45 degree angle, level the
chain saw again and repeat steps until you cut fully through.
•
When the tree is supported along its entire length, make a
cut from the top (overbuck), but avoid cutting the earth as
this will dull your saw quickly.
Fig. W
22
•
Figure X- When supported at one end
First, cut 1/3 the diameter from the underside (underbuck).
Then make the finishing cut by overbucking to meet the
first cut.
51 mm
FELLING BACK CUT
HINGE
of the chain saw behind the area
22
CUT FROM TOP (OVERBUCK)AVOID
CUTTING EARTH
EnGLIsh
51 mm
47
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