Instruction Manual

4.4 Sapwood cuts
001BA150 KN
Sapwood cuts in long-fibered softwood help pre‐
vent sapwood splintering when the tree falls.
Make cuts at both sides of the trunk at same
height as bottom of felling notch to a depth of
about 1/10 of trunk diameter. On large diameter
trees, cut to no more than width of guide bar.
Do not make sapwood cuts if wood is diseased.
4.5 Basic information on felling cut
Basic dimensions
001BA259 KN
G
E
C
C
Ø
1/10
The felling notch (C) determines the direction of
fall.
The hinge (D) functions like a real hinge to guide
the tree to the ground.
–
Width of hinge: approx. 1/10 of the trunk diam‐
eter
–
Never saw through the hinge while felling –
otherwise the tree will fall in a direction other
than the one planned – risk of accident!
–
With rotten trunks, leave a wider hinge
The tree is felled with the felling cut (E).
–
Cut horizontally
–
1/10 (at least 3 cm) of tree diameter higher
than bottom of felling notch (C).
The holding strap (F) or stabilizing strap (G) sup‐
ports the tree and helps prevent it from falling
prematurely.
–
Width of strip: approx. 1/10 to 1/5 of the trunk
diameter
–
Do not cut into the strip during the felling cut
–
With rotten trunks, leave a wider strip
Plunge cutting
–
For relieving cuts during shortening
–
For wood carving
001BA269 KN
3.
1.
2.
► Use a low kickback saw chain and proceed
with special care
1.Begin cut by applying the lower portion of the
guide bar nose – do not use upper portion
because of risk of kickback. Cut at full strength
until the depth of the kerf is twice the width of the
guide bar2.Swing the machine slowly into the
plunge cutting position – risk of kickback and
pushback!3.Make the plunge cut very carefully.
Risk of pushback.
001BA270 KN
Where possible, use a plunge blade. The plunge
blade and the upper/lower side of the guide bar
are parallel.
During plunge cutting, the plunge bar helps to
keep the hinge parallel in form, i.e. the same
thickness at all points. To do this, guide the
plunge bar parallel to the sink chord.
Felling wedges
Insert the felling wedge as soon as possible, i.e.
as soon as no obstruction of saw control is to be
expected. Position the felling wedge in the felling
cut and drive in with suitable tools.
Only use aluminum or plastic wedges – do not
use steel wedges. Steel wedges can seriously
damage the saw chain and cause dangerous
kickback.
English 4 Working Techniques
12 0458-533-8321-E