To Avoid Kickback; Cutting Techniques - Makita EA3600F Manual De Empleo Y De Seguridad

To avoid kickback

The best protection from personal-injury that may result from
kickback is to avoid kickback situations:
1. Hold the chain saw firmly with both hands and maintain a secure
grip.
2. Be aware of the location of the guide bar nose at all times.
3. Never bring the nose of the guide bar in contact with any object.
Do not cut limbs with the nose of the guide bar. Be especially
careful with small, tough limbs, small size brush and saplings
which may easily catch the chain.
4. Don't overreach.
5. Don't cut above shoulder height.
6. Begin cutting and continue at full throttle.
7. Cut only one log at a time.
8. Use extreme caution when re-entering a previous cut.
9. Do not attempt plunge cuts (see section "Plunge-Cut Method") if
you are not experienced with these cutting techniques.
10. Be alert for shifting of the log or other forces that may cause the
cut to close and pinch the chain.
11. Maintain saw chain properly. Cut with a correctly sharpened,
properly tensioned chain at all times.
12. Stand to the side of the cutting path of the chain saw.
Pushback
Pushback occurs when the chain on the top of the bar is suddenly
stopped when it is pinched, caught or encounters a foreign object
in the wood. The reaction of the chain drives the saw straight back
toward the operator causing loss of saw control. Pushback frequently
occurs when the top of the bar is used for cutting (Fig. 14).
To avoid pushback
1. Be alert to forces or situations that may cause material to pinch
the top of the chain.
2. Do not cut more than one log at a time.
3. Do not twist the saw when withdrawing the bar from a plunge cut
or under buck cut (Figures 25 to 27 and 33, see section "Plunge-
Cut Method" and "Bucking"), because the chain can pinch.
Pull-in
Pull-in occurs when the chain on the bottom of the bar is suddenly
stopped. The chain on the bottom of the bar stops when it is pinched,
caught or encounters a foreign object in the wood (see Fig. 15). The
reaction of the chain pulls the saw forward, causing the operator to
lose control.
Pull-in frequently occurs when the spike bumper of the saw is not
held securely against the tree or limb and when the chain is not
rotating at full speed before it contacts the wood.
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Use extreme caution when cutting small size brush and saplings
which may easily catch the chain and pull you off balance.
To avoid pull-in
1. Always start a cut with the chain rotating at full speed and the
spike bumper in contact with the wood.
2. Pull-in may also be prevented by using plastic wedges to open
the kerf or cut.

Cutting techniques

Felling
Felling is cutting down a tree.
Before felling a tree, consider carefully all conditions which may affect
the direction of fall, including:
The intended direction of the fall.
The neutral lean of the tree.
Any unusually heavy limb structure.
Surrounding trees and obstacles.
The wind direction and speed.
Always observe the general condition of the tree. Look for decay
and rot in the trunk. If it is rotted inside, it could snap and fall
toward the operator while being cut.
Also look for broken or dead branches which could vibrate loose
and fall on the operator. When felling on a slope, the operator
should stand on the up-hill side.
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When felling in the vicinity of roads, railways and power lines, etc.,
take extra precautions (see Fig. 16).
Inform the police, utility company or railway authority before
beginning to cut.
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WARNING!
WARNING!
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