ICFR – Chainsaw Safety and Operating Handbook
37
•
Step 2:
Complete the cut from the top side
with the two cuts meeting.
Figure 40: Tension on upper side
12.5.2
t
enSion
on
the
lower
Side
The top of the log is under compression and the bottom
under tension. The stem springs downwards. Use the
following procedure:
•
Step 1:
Make a cut downwards for about 1/3
of the log diameter or until the cut
begins to pinch the guide bar. Remove
the guide bar with the saw chain at full
speed.
•
Step 2:
Complete the cut from the bottom side
with the two cuts meeting.
Figure 41: Tension on lower side
12.5.3
l
AterAl
tenSion
Where the log is under lateral tension it is important
for the operator to stand on the inside of the curve (the
compression side) when cutting since the stem can
easily snap outward after the cross-cut.
As described previously, always start the cut on the
compression side (the inside of the curve).
Figure 42: Lateral tension
12.5.4
b
utting
of
A
rootplAte
Storm-damaged trees that have their rootplates still
attached require special treatment and must be done
under supervision. When cross-cut, the rootplate can
spring back to its original position and the log can
move sideways towards the operator.
Figure 43: Butting of the root plate
Use the procedure in Figure 44 where the second cut
is placed slightly beside the first one.
Figure 44: Butting of the rootplate
