Publicité
Les langues disponibles
Les langues disponibles
WARNING:
Never cut through to the notch when making a backcut.
The hinge controls the fall of the tree, this is the section
of wood between the notch and backcut.
BUCKING
See Figures 16 - 19.
Bucking is the term used for cutting a fallen tree to the de-
sired 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.
„ Keep a clear cutting area. Make sure that no objects can
contact the guide bar nose and chain during cutting, this
can cause kickback. Refer to Kickback earlier in this
manual.
„ When bucking on a slope, always stand on the uphill side
of the log. To maintain complete control of the chain saw
when cutting through the log, release the cutting pres-
sure near the end of the cut without relaxing your grip on
the chain saw handles. Do not let the chain contact the
ground. After completing the cut, wait for the saw chain
to stop before you move the chain saw. Always stop the
motor before moving from tree to tree.
BUCKING LOGS UNDER STRESS
See Figures 18 - 19.
When the log is supported along its entire length, it should
be cut from the top or overbucking.
When the log is supported on one end, cut 1/3 the diameter
from the underside or underbucking. Then make the finishing
cut by overbucking to meet the first cut.
As the log is being cut, it will tend to bend. The saw
can become pinched or hung in the log if you make
the first cut deeper than 1/3 of the diameter of the log.
Give special attention to logs under stress to prevent the
bar and chain from pinching.
TYPES OF CUTTING USED
See Figure 19.
OVERBUCKING
Begin on the top side of the log with the bottom of the saw
against the log; exert light pressure downward. Note that
the saw will tend to pull away from you.
UNDERBUCKING
Begin on the under side of the log with the top of the saw
against the log; exert light pressure upward. During under-
bucking, the saw will tend to push back at you. Be prepared
for this reaction and hold the saw firmly to maintain control.
OPERATION
LIMBING
See Figure 20.
WARNING:
Never climb into a tree to limb or prune. Do not stand on
ladders, platforms, a log, or in any position which can
cause you to lose your balance or control of the saw,
which could result in death or other serious personal
injury.
Limbing is removing branches from a fallen tree.
„ Work slowly, keeping both hands on the chain saw with
a firm grip. Always make sure your footing is secure and
your weight is distributed evenly on both feet.
„ Leave the larger support limbs under the tree to keep the
tree off the ground while cutting.
„ Limbs should be cut one at a time. Remove the cut limbs
from the work area often to help keep the work area clean
and safe.
„ Branches under tension should be cut from the bottom
up to avoid binding the chain saw.
„ Keep the tree between you and the chain saw while limb-
ing. Cut from the side of the tree opposite the branch
you are cutting.
PRUNING
See Figure 21.
Pruning is trimming limbs from a live tree.
„ Work slowly, keeping both hands on the chain saw with
a firm grip. Always make sure your footing is secure and
your weight is distributed evenly on both feet.
„ Do not cut from a ladder, this is extremely dangerous.
Leave this operation for professionals.
„ Do not cut above chest height as a saw held higher is
difficult to control against kickback.
„ When pruning trees it is important not to make the finish-
ing cut next to the main limb or trunk until you have cut
off the limb further out to reduce the weight. This prevents
stripping the bark from the main member.
„ Underbuck the branch 1/3 through for your first cut.
„ Your second cut should overbuck to drop the branch off.
„ Now make your finishing cut smoothly and neatly against
the main member so the bark will grow back to seal the
wound.
WARNING:
If the limbs to be pruned are above chest height, hire a
professional to perform the pruning. Failure to do so could
result in death or serious personal injury.
13 - English
Publicité
