POWER SMITH PCS140H Manual Del Operador página 19

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Consider the force and direction of the wind, the lean and balance of the tree, and the location of large limbs. These
things influence the direction in which the tree will fall. Do not try to fell a tree along a line different from its natural
line of fall.
•
Remove dirt, stones, loose bark, nails, staples, and wire from the tree where felling cuts are to be made.
Notched Undercut (FIG 18)
•
Cut a notch about 1/3 the diameter of the trunk in the
side of the tree. Make the notch cuts so they intersect
at a right angle to the line of fall. This notch should be
cleaned out to leave a straight line. To keep the weight of
the wood off the saw, always make the lower cut of the
notch before the upper cut.
Felling Back cut (FIG 18)
•
As the felling cut gets close to the hinge the tree should
begin to fall. If there is any chance 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 of wood, plastic or aluminum to open the
cut and drop the tree along its desired line of fall. Make
the back-cut level and horizontal, and at a minimum of
2" (5 cm) above the horizontal cut of the notch.
NOTE:
Never cut through to the notch. Always
leave a band of wood between the notch and back cut
(approximately 2" (5 cm) or 1/10 the diameter of the
tree). This is called "hinge" or "hinge wood." It controls
the fall of the tree and prevents slipping or twisting or
shoot back of the tree off the stump.
•
On large diameter trees, stop the back cut before it is
deep enough for the tree to either fall or settle back on
the stump. Then insert soft wooden or plastic wedges
into the cut so they do not touch the chain. Drive wedges
in, little by little, to help jack the tree over. See figure 19.
•
As tree starts to fall, stop the chain saw and put it down
immediately. Retreat along the cleared path but watch
the action in case something falls your way.
REMOVING BUTTRESS ROOTS
A buttress root is a large root extending from the trunk of the
tree above the ground. Apply a vertical cut and horizontal cut
as shown in figure 20. Remove the resulting loose section
from the work area. Follow the correct tree felling procedure
as stated in Proper Procedure for Tree Felling after you have
removed the large buttress roots.
BUCKING
Bucking is the term used for cutting a fallen tree to the
desired log length.
•
Always make sure your footing is secure and your weight
is distributed evenly on both feet.
• Cut only one log at a time.
•
Support small logs on a saw horse or another log while
bucking.
English
OPERATION
19
FIG 18
DIRECTION OF FALL
HINGE
2" OR 1/10
DIAMETER
BACK CUT
2" min.
FIG 19
WEDGE
VERTICAL CUT
KICKBACK
NOTCH
APPROX.
1/3 DIAMETER
FIG 20
LOOSE SECTION
HORIZONTAL CUT
FIG 21