Poulan 3400 Manuel d'utilisateur télécharger pdf (Page 13)

3. FELLING LARGE TREES

OR MORE

6' DIAMETER

The notch method is used to cut large trees. A

notch is cut on the side of the tree in ^e desired

direction of fall. After a felling cut is made on the

opposite side of the tree, the tree will tend to fall

into the notch.

NOTE: if the tree has large buttress roots, remove

before making the notch. Cut into the buttresses

vertically, then horizontally. Figure 19

a. Make the notch cut. Figure 21 .

1. ) Cut the bottom of thè notch first, through 1 /3

of the diameter of the tree.

2. ) Complete the notch by making frie slant cut.

3. ) Remove the notch of wood.

b. Make the felling cut on the opposite side of the

notch about 2" higher than the bottom of the

notch.

c. Leave enough uncut wood between the felling

cut and the notch to form a hinge. Rgure 22.

NOTE: The hinge helps to keep the tree from

twisting and falling in the wrong direction.

d. Use a wedge if there is any chance that the tree

will not fall In the desired direction.

NOTE: Before the felling cut is complete, drive

wedges to open upthe cut when necessary to con

trol the direction of fall. Use wood or plastic wedges

but never metal, to avoid kickback and chain

damage.

e. Be alert for signs that the tree is ready to fall:

1. ) cracking sounds

2. ) widening of the felling cut

3. ) movement in the upper branches.

Figure 21

Figure 22

/U WARNING

Stay on the uphill side of the terrain to avoid the

tree rolling or sliding downhill after it is felled.

f. As the tree starts to fall, stop the saw,' put it

down, and get away quickly on your planned re-

treatpath.

g. Be extremely cautious with partially fallen trees

that may be poorly supported. When a tree

doesn’t fall completely, set the saw aside and

pull down the tree with a cable winch, block and

tackle or tractor. Do not cut it down with your

sawto avoid injury.

C. BUCKING

Bucking is the term used for cutting a fallen tree

to the desired log size.

1. IMPORTANT POINTS

a. Cut only one log at a time.

b. Cut shattered wood very carefully. Sharp

pieces of wood could be flung toward the

operator.

c. Use a sawhorse to cut small logs. Never

allow another person to hold the log while cut

ting and never hold the log with your leg or foot.

d. Give special attention to logs under strain to

prevent the saw from pinching. Make the first

cut on the pressu re side to retieye the stress

on the log. Figure 23 -

e. Do not cut in an area ^ere logs, limbs and

roots are tangled such as in a blown down

area: Drag the logs intp a clear area before cut

ting bypulling put expose!^ and cleared logs

first.

Make the first bucking cut 1/3 of the way

through the log and finish with a 2/3 cut on

the opposite side. As the log is being cut, it will

tend to bend. The saw can become pinched or

hung in the log if you make the first cut deeper

than 1 /3 of ttie diameter of the log.

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Poulan 3400 Manuel d'utilisateur Page 13

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