Handleiding Makita DUC405Z (pagina 15 van 128) (Nederlands, Duits, Engels, Frans, Italiaans, Portugees, Spaans, Turks, Deens)

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15 ENGLISH

If you cannot cut the timber right through with a single

stroke:

Apply light pressure to the handle and continue sawing

and draw the chain saw back a little; then apply the

spikebumperalittlelowerandnishthecutbyraising

the handle.

►Fig.20

Bucking

1. Rest the bottom edge of the chain saw body on

the wood to be cut.

►Fig.21

2. With the saw chain running, saw into the wood

while using the rear handle to raise the saw and the

front one to guide it. Use the spike bumper as a pivot.

3. Continue the cut by applying slight pressure to

the front handle, easing the saw back slightly. Move

the spike bumper further down the timber and raise the

front handle again.

NOTICE: When making several cuts, switch the

chain saw off between cuts.

CAUTION: If the upper edge of the bar is used

for cutting, the chain saw may be deected in

your direction if the chain becomes trapped. For

this reason, cut with the lower edge, so that the

saw will be deected away from your body.

►Fig.22

When you cut a wood under tension, cut the pressured

side(A)rst.Thenmakethenalcutfromthetensioned

side (B). This prevents the bar from becoming trapped.

►Fig.23

Limbing

CAUTION: Limbing may only be performed by

trained persons. A hazard is presented by the risk

of kickback.

When limbing, support the chain saw on the trunk if

possible. Do not cut with the tip of the bar, as this pres-

ents a risk of kickback.

Pay particular attention to branches under tension. Do

not cut unsupported branches from below.

Do not stand on the felled trunk when limbing.

Burrowing and parallel-to-grain cuts

CAUTION: Burrowing and parallel-to-grain

cuts may only be carried out by persons with

special training. The possibility of kickback presents

ariskofinjury.

Perform parallel-to-grain cuts at as shallow an angle as

possible. Take an extra caution when carrying out the

cut as the spike bumper cannot be used.

►Fig.24

Felling

CAUTION: Felling work may only be per-

formed by trained persons. The work is hazardous.

Observe local regulations if you wish to fell a tree.

►Fig.25: 1. Felling area

— Before starting felling work, ensure that:

• Only persons involved in the felling operation

are in the vicinity;

•

Any person involved has an unhindered path

of retreat through a range of approximately

45° either side of the felling axis. Consider the

additional risk of tripping over electrical cables;

• The base of the trunk is free of foreign

objects,rootsandranches;

• Nopersonsorobjectsarepresentovera

distance of 2 1/2 tree lengths in the direction

in which the tree will fall.

— Consider the following with respect to each tree:

• Direction of lean;

• Loose or dry branches;

• Height of the tree;

• Natural overhang;

• Whether or not the tree is rotten.

— Consider the wind speed and direction. Do not

carry out felling work if the wind is gusting strongly.

—

Trimming of root swellings: Begin with the largest swell-

ings.Maketheverticalcutrst,thenthehorizontalcut.

— Stand to the side of the falling tree. Keep an area

clear to the rear of the falling tree up to an angle of

45° either side of the tree axis (refer to the “felling

area”gure).Payattentiontofallingbranches.

— An escape path should be planned and cleared

as necessary before cuts are started. The escape

path should extend back and diagonally to the rear

oftheexpectedlineoffallasillustratedingure.

►Fig.26: 1. Felling direction 2. Danger zone

3. Escape route

When felling trees, follow the procedures below:

Cut a scarf as close to the ground as possible. First make

the horizontal cut to a depth of 1/5 -1/3 of the trunk diameter. Do

not make the scarf too large. Then make the diagonal cut.

►Fig.27

NOTE: The scarf determines the direction in which

the tree will fall, and guides it. It is made on the side

towards which the tree is to fall.

Make the back cut a little higher than the base cut of

the scarf. The back cut must be exactly horizontal. Leave

approximately 1/10 of the trunk diameter between the back

cutandthescarf.Thewoodbersintheuncuttrunkportion

act as a hinge. Insert wedges into the back cut in time.

►Fig.28

WARNING: Do not cut right through the bers

under any circumstances. The tree will otherwise

fall unchecked.

NOTICE: Only plastic or aluminum wedges may

be used to keep the back cut open. The use of

iron wedges is prohibited.

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