30
Fig 20
Direction of fall
Notch
Hinge
50 mm
50 mm
Felling back cut
Undercutting
Fig 19
Escape
route
Danger zone
Escape
route
Danger zone
Escape route
Felling direction
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.
Remove dirt, stones, loose bark, nails, staples and wire from the tree.
Notching undercut
Make the notch 1/3 the diameter of the tree, perpendicular to the direction of falls .
As shown in Figure 20
Make the lower horizontal notching cut rst. This will help to avoid pinching either the saw
chain or the guide bar when the second notch is being made.
Felling back cut
Make the felling back cut at least 50 mm higher than the horizontal notching cut .
As shown in Figure 20
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.
OPERATION
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