Husqvarna 3120XP 用户手册

English

 – 21

The directional cuts should run 1/4 of the diameter through 
the trunk and the angle between the top cut and bottom cut 
should be 45

°.

The line where the two cuts meet is called the directional cut 
line. This line should be perfectly horizontal and at right 
angles (90

°) to the chosen felling direction.

The felling cut is made from the opposite side of the tree and 
it must be perfectly horizontal. Stand on the left side of the 
tree and cut on the pull stroke.

Make the felling cut about 3-5 cm (1.5-2 inches) above the 
bottom directional cut.

Use full throttle and bring the bar and chain slowly into the 
tree. Make sure the tree does not start to move in the opposite 
direction to your intended felling direction. Drive a wedge or 
breaking bar into the cut as soon as it is deep enough.

Finish the felling cut parallel with the directional cut line so 
that the distance between them is at least 1/10 of the trunk 
diameter. The uncut section of the trunk is called the felling 
hinge.

The felling hinge controls the direction that the tree falls in.

All control over the felling direction is lost if the felling hinge is 
too narrow or non-existent, or if the directional cuts and felling 
cut are badly placed.

When the felling cut and directional cut are complete the tree 
should start to fall by itself or with the aid of a felling wedge or 
breaking bar.

We recommend that you use a bar that is longer than the 
diameter of the tree, so that you can make the felling cut and 
directional cuts with single cutting strokes. See the Technical 
data section to find out which lengths of bar are 
recommended for your saw.

There are methods for felling trees with a diameter larger than 
the bar length. However these methods involve a much 
greater risk that the kickback zone of the bar will come into 
contact with the tree.