Stihl MS 261 C-M Instruction Manual page 15

Determine direction of fall with gunning
sight on cover and fan housing
Your chainsaw has a gunning sight on
the cover and fan housing. Use this
gunning sight.
Making the felling notch
When making a felling notch, align the
chainsaw so that the notch lies at a right
angle to the direction of fall.
During the procedure, various
sequences are permitted for making a
felling notch with a bottom (horizontal)
cut and top (angled) cut – comply with
national legislation regarding felling
technique.
Make a bottom (horizontal) cut
N
Make the top (angled) cut
N
approx. 45°- 60° to the bottom cut
MS 261 C-M
Checking the direction of fall
Insert the chainsaw with guide bar in
N
the bottom of the felling notch. The
gunning sight must point in the
planned direction of fall – if
necessary, correct direction of fall
by re-cutting the felling notch.
Sapwood cuts
Sapwood cuts in long-fibered softwood
help prevent 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.
Basic information on felling cut
Basic dimensions
C
C E
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 diameter
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
English
1/10
Ø
G
13