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Idiomas disponibles
Idiomas disponibles
Securing the work position for two-handed use
To allow the operator to hold the saw with both hands,
they should as general rule, aim for secure work position
where they are operating the saw at:
•
hip level when cutting horizontal sections.
•
solar plexus level when cutting vertical sections.
Where the operator is working close into vertical stems
with a low lateral forces on their work position, then a
good footing may be all that is needed to maintain a
secure work position. However as operators move away
from the stem, they will need to take steps to remove or
counteract the increasing lateral forces by, for example, a
re-direct of the main line via a supplementary anchor
point or using an adjustable strop direct from the harness
to a supplementary anchor point.
Gaining a good footing at the working position can be
assisted by use of a temporary foot stirrup created from
an endless sling.
Starting the saw in the tree
When starting the saw in the tree, the operator should:
a) apply the chain brake before starting.
b) hold saw on either the left or right of the body when
starting:
1
on the left side hold the saw with the left hand on the
front handle and thrust the saw away from the body
while holding the pull starter cord in the other hand.
2
on the right side, hold the saw with the right hand on
either handle and thrust the saw away from the body
while holding the pull starter cord in the left hand.
The chain brake should always be engaged before
lowering a running saw onto its strop. Operators should
always check the saw has sufficient fuel before
undertaking critical cuts.
One-hand use of the chainsaw
Operators should never use a chain saw onehanded.
Operators should never:
•
cut with the kickback zone at the tip of the chainsaw
guide bar
•
'hold and cut' sections.
•
attempt to catch falling sections.
•
Cut in the tree when he/she is only secured with one
rope, always use 2 secured lines.
•
check condition of harness, belt and ropes at regular
frequent intervals.
WORKING TECHNIQUES
Freeing a trapped saw
If the saw should become trapped during cutting,
operators should:
•
switch off the saw and attach it securely to the tree
inboard (i.e. towards the truck side) of the cut or to a
separate tool line.
•
pull the saw from the kerf whilst lifting the branch as
necessary.
•
if necessary, use a handsaw or second chain saw to
release the trapped saw by cutting a minimum of 30
cm away from the trapped saw.
Whether a handsaw or a chainsaw is used to free a stuck
saw, the release cuts should always be outboard (toward
the tips of the branch), in order to prevent the saw being
taken with the section and further complicating the
situation.
Basic cutting technique
WARNING! Never use a chain saw by
!
holding it with one hand. A chain saw is
not safely controlled with one hand; you
can cut yourself. Always have a secure,
firm grip around the handles with both
hands.
General
•
Always use full throttle when cutting!
•
Reduce the speed to idle after every cut (running the
engine for too long at full throttle without any load, i.e.
without any resistance from the chain during cutting,
can lead to serious engine damage).
•
Cutting from above = Cutting on the pull stroke.
•
Cutting from below = Cutting on the push stroke.
Cutting on the push stroke increases the risk of kickback.
See instructions under the heading How to avoid
kickback.
Terms
Cutting = General term for cutting through wood.
Limbing = Cutting branches off a felled tree.
Splitting = When the object you are cutting breaks off
before the cut is complete.
–
English
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