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4.
Delimbing
This is the separation of the branches from the felled tree. When pruning, leave larger
branches pointing downwards to support the tree for the time being. Keep smaller
branches away from the ground as shown in Figure 16 (A = Direction of cut when pruning, B
= Distance from the ground). Leave supporting branches standing until the trunk is sawn
with a cut. Branches that are under tension should be sawn from bottom to top to avoid
jamming the saw.
5.
Cut tree trunk to length
This means dividing the felled tree into sections. Make sure that you stand securely and
that your body weight is evenly distributed on both feet. If possible, the trunk should be
supported by branches, beams or wedges. Follow the simple instructions for light sawing.
When the entire length of the log is evenly supported, as shown in Figure 17, saw from
above. Be careful not to cut into the ground.
If the log is resting on one end, as shown in Figure 18, first saw 1/3 of the log diameter from
the bottom (A) to avoid splintering. Make the second cut from above (2/3 diameter) at the
level of the first cut (B) (to avoid jamming).
When the log rests on both ends, as shown in Figure 19, first saw 1/3 of the log diameter
from the top to avoid splintering (A). Make the second cut from below (2/3 diameter) at the
level of the first cut (B) (to avoid jamming).
When sawing on slopes, always stand above the tree trunk, as shown in Figure 13. To
maintain full control at the moment of sawing, reduce the contact pressure towards the
end of the cut without loosening the firm grip on the handles of the chainsaw. Make sure
that the saw chain does not touch the ground. When the cut is complete, please wait for
the saw chain to stop before removing the chainsaw. Always switch off the chainsaw motor
before changing from tree to tree.
6.
Kickback
Kickback is the sudden up and backstroke of the running chainsaw. The causes are usually
touching the workpiece with the tip of the sword or jamming the saw chain.
In the event of recoil, significant forces may suddenly occur, and the chainsaw will usually
react uncontrolled. The result is often serious injury to workers or people in the vicinity.
Particularly with lateral cuts, inclined cuts and longitudinal cuts, the danger of kickback is
particularly great because the claw stop cannot be used. Avoid such cuts as far as possible
and work particularly carefully if they cannot be avoided.
The danger of kickback is greatest if you place the saw in the area of the tip of the sword as
this is where the leverage is strongest (Fig. 20). Always place the saw flat and close to the
claw (Fig. 21).
7.
Sawing of wood under tension
Sawing wood that is under tension requires special care. Wood under tension, which is
released from tension by sawing, sometimes reacts completely uncontrolled.
This can lead to serious or even fatal injuries (Fig. 22-24).
Such work may only be carried out by trained specialists.
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