Stihl MS 192 Instruction Manual page 13

Large diameter trees: sectioning method
1
If the diameter of the tree is greater than
the length of the guide bar, use the
sectioning method.
1. First cut
Nose of guide bar should enter
wood just behind the hinge – hold
the saw horizontally and swing it as
far as possible, using the bumper
spike as a pivot – avoid
repositioning the saw more than
necessary.
MS 192 C
2
4
2. When repositioning the saw for the
next cut, keep the guide bar fully
engaged in the kerf to keep the
felling cut straight – engage the
spiked bumper again, and so on.
3. Insert a wedge (3) in the cut.
4. Last cut: Engage the spiked bumper
as for the simple fan cut – do not cut
through the hinge.
Special cutting techniques
Plunge cuts and heartwood cuts require
special training and experience.
Plunge cutting
For felling leaners
–
For relieving cuts during bucking
–
For DIY projects
–
2
1
Use a low kickback chain and
N
exercise particular caution
1. Begin cut by applying the lower
portion of the guide bar nose – do
not use upper portion because of –
risk of kickback. Cut until depth of
kerf is twice the width of the guide
bar.
2. Swing saw slowly into plunge-
cutting position – take care because
of the risk of kickback or pushback.
3. Make the plunge cut very carefully.
Danger of pushback.
Heartwood cut
If tree diameter is more than twice
–
the length of the guide bar.
If a large portion of heartwood
–
remains uncut on large diameter
trees.
English
3
11