Stihl MS 391 Safety Manual page 12

English
Thin trunks: simple fan cut
N Engage the spiked bumper behind
the hinge. Pivot the chain saw
around this point – only as far as the
bridge – the spiked bumper rolls
against the trunk.
10
Large diameter trunks: sectioning
method
1
Use the sectioning method if the
diameter of the trunk exceeds the length
of the chain saw guide bar.
1. First cut
The nose of the guide bar should
enter the wood just behind the hinge
– hold the saw absolutely
horizontally and swing it as far as
possible – use the spiked bumper
as a pivot point – reposition the
chain saw as little as possible.
2
4
2. While repositioning for the next cut,
keep the guide bar fully engaged in
the cut in order to avoid an uneven
felling cut - apply the spiked bumper
again, etc..
3. Insert wedge (3)
4. Last cut: Position the chain saw as
for the simple fan cut – do not saw
through the hinge!
Special cutting techniques
Plunge-cutting and heartwood cutting
require training and experience.
Plunge-cutting
– for felling leaners
– for relieving cuts during bucking
– for DYI projects
Chain Saw Safety Manual