Oregon CS1200-091 Manuel D'instructions Original page 18

Notching Undercut
• First, make the notch 1/3 the diameter of the
tree perpendicular to the direction of fall
Make the lower horizontal notching undercut
first (1) This will help to avoid pinching of
either the saw chain or the guide bar when the
second cut (2) is being made (Fig 11)
FIG. 11
NOTCHING UNDERCUT
DIRECTION
OF FALL
NOTCH
Felling Back Cut
• Second, make the felling back cut at least
50 mm (2 in) higher than the horizontal
notching undercut (Fig 12) Keep the felling
back cut parallel to the horizontal notching
undercut
FIG. 12
FELLING BACK CUT
50 MM
(2 IN)
DIRECTION
OF FALL
NOTCH
HINGE
• 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 cut gets close to the hinge, the
tree should begin to fall
18
Operating the Chainsaw
(2)
(1)
FELLING
BACK CUT
50 MM
(2 IN)
• 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 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
chainsaw from the cut, stop the motor, put
the chainsaw down, then use the retreat path
planned
• Be alert for overhead limbs falling and watch
footing
LIMBING A TREE
CAUTION: Limbs under tension can
"spring back" and contact the operator
or throw the chainsaw out of control
resulting in personal injury. Always be
alert for wood under tension which may
strike the operator or chainsaw when cut.
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
• Branches under tension should be cut from
the bottom up to avoid binding the chainsaw
(Fig 13)
FIG. 13
TREE LIMBING
LIMB CUT
KEEP WORK OFF GROUND
LEAVE SUPPORT LIMBS UNTIL LOG IS CUT
Chainsaw Model CS1200-091