Petrol Powered Chainsaws
E&OE
©2017 Bäumr-AG
20
Basic Cutting Guidelines
The following information are general guidelines to chainsaw use:
Removing Branches/Limbs from Fallen Trees (Limbing)
•
Be alert to high kick-back dangers from other bracnhes or tree trunk.
•
Be alert to brnches/limbs under tension that could move suddenly or launch when being cut.
•
Do NOT stand on the log.
•
Remove the thinner upper branches first, then move down the trunk to the lower larger branches.
Cutting Logs into Sections (Bucking)
•
Ensure the log is stable and cannot move or roll.
•
Do NOT stand on the log.
•
Cut one piece of timber at a time.
•
Do NOT permit another person to hold the log. Do NOTsteady the log
with your legs or feet.
•
When cutting logs under tension or strain, be alert to pinching the saw chain. Start by making a cut on
the compression side (
1
), then cut from the tension side (
2
).
Basic Tree Felling
•
Be alert to any power lines, cable or structures.
•
Maintain a minimum distance of 2.5 times the height of the tree being
felled to any other person.
•
Always consider all conditions that may affect the fall direction of the
tree, including structures and/or other tress, tress condition and decay,
wind direction and speed, slope of the land etc.
•
Establish escape paths (
A
) that can be used if the tree does not fall as
expected. The paths should be clear of obstacles, including equipment,
and be at 45° angles to the opposite direction of tree fall (
B
).
•
Use extreme caution when felling trees that are decayed or rotten inside
or if the trunk is under tension due to tree weight etc.
•
For large butress roots, remove the roots before felling. When cutting into
buttress roots, cut veritcally (
1
) first, then horizontally (
2
). Remove the
section of root.
•
Cut the felling notch (
C
) perpendicular (90°) to the line of fall and as close to
ground level as practical. The angled cut (
5
) of the felling notch should be
cut first and at an approximate 45° to the trunk and should extend into the
trunk approximately 20 to 25% of the trunk diameter. Then, make the
horizontal cut (
6
) of the felling notch. Remove the section of trunk.
•
Make the horizontal felling cut (
7
)
approximately 25 to 50mm (1 to 2")
above the centre of the felling notch, and
extend it into the trunk so that
approximately 10% of the trunk remains
uncut to create the "hinge" (
E
)
– do NOT
cut through the hinge.
•
To start and control direction of the fall,
drive wooden wedges into the felling cut
(
7
), as needed.
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