Felling Back Cut; Bucking A Log; Limbing A Tree - Ayce SF7J139D-2 Notice Originale

Fig.22 Description of felling: undercutting

Felling back cut

Make the felling back cut at least 50 mm higher than the horizontal notching cut as
illustrated in Figure 22. 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.
As the felling gets close to the hinge, the tree should begin to fall. If there is any chance
that the tree may not fall in desired direction or it may rock back and bind the saw chain,
stop cutting before the felling back cut is complete and use wedges of wood, plastic or
aluminium 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.

Limbing a tree

Limbing is 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 as illustrated
in Figure 23. Branches under tension should be cut from the bottom up to avoid binding
the chain saw.
Fig.23 Tree limbing

Bucking a log

Bucking is cutting a log into lengths. It is important to make sure your footing is firm and
your weight is evenly distributed on both feet. When possible, the log should be raised
and supported by the use of limbs, logs or chocks. Follow the simple directions for easy
cutting.
When the log is supported along its entire length as illustrated in Figure 24, it is cut from
the top (overbuck).
When the log is supported on one end, as illustrated in Figure 25, cut 1/3 the diameter
from the underside (underbuck). Then make the finished cut by overbucking to meet the
first cut.
When the log is supported on both ends, as illustrated in Figure 26, cut 1/3 the diameter
from the top (overbuck). Then make the finished cut by underbucking the lower 2/3 to
meet the first cut.
When bucking on a slope always stand on the uphill side of the log, as illustrated in
Figure27. When "cutting through", to maintain complete control release the cutting
pressure near the end of the cut without relaxing your grip on the chain saw handles.
Don't 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.
Fig. 24 Log supported along the entire length
Fig. 25 Log supported one end
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