valutazioni - 5, GPA: 4.2
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Facilità d'uso
THINK SAFETY! Wear hearing protection and eye protection such as a face shield or goggles when operating the unit to shield against saw dust. WARNING! NEVER operate with a loose saw chain! NEVER operate the saw if any component parts are damaged, loose, or missing! Always wear gloves when operating this saw. Use full-throttle while cutting and apply only enough bar pressure to maintain engine speeds of 9,000-10,000 min-1. Clear a safe work area before cutting. Always wear leg protection (Chaps) made of a cut-resistant material such as ballistic nylon covering the full length of the thigh to the top of the boot. Wear appropriate non-skid footwear. Wear close-fitting clothing to protect your legs and arms. Do not wear clothing or jewelry that could get caught in the machinery or brush. Keep a proper footing (do not overreach)! Felling Trees CS_Felling Large TreesEscape Path WARNING! When felling, keep at least 2 tree lengths away from your fellow workers. WARNING! Diseased, damaged, or otherwise unbalanced trees can fall unpredictably during felling, and should be left to an experienced timber faller! Direction of Fall Before Felling a Tree Determine the direction of fall by 1. inspecting: Tree shape and angle of lean.a. Size and shape/placement of limbs.b. Location of nearby trees or other c. obstacles. Condition of tree (damage, disease, etc.).d. Prevailing wind direction.e. Clear a safe work area around the tree. 2. Be alert for loose or dead limbs overhead. Clear an appropriate escape path approximately 45° from the direction of fall. Notify nearby workers of your 3. intentions! Escape Path Felling Small Trees (Under 6” (15cm) diameter) Determine the direction of fall. If 1. uncertain as to the direction of fall, use the procedure “Felling Large Trees” as outlined in the next section. Engage the bumper spike against the 2. trunk of the tree and start to cut on the side of the tree away from the fall. Make a single cut all the way through the tree. When the tree begins to fall, stop the 3. saw, and put it down on the ground. Use your retreat path to exit the area 4. quickly. 45° Direction Of Fall Escape Path Bumper Spike 45° Felling Trees (continued) Felling Larger Trees (Over 6” (15 cm) diameter) Wooden Hinge WARNING! Failure to leave a proper wooden hinge during the felling or “back cut” can cause the tree to pinch the saw’s guide bar and may also change the direction of fall! If a tree is otherwise healthy and not ¦¦ seriously out of balance, its direction of fall can often be encouraged by first “notching” the tree on the side facing the desired direction of fall. After the notch is completed, start the ¦¦ felling cut slightly higher and on the opposite side of the tree, away from the direction of fall. The goal of the method is to leave a ¦¦ sturdy wooden “hinge” for the tree to pivot on while falling. Determine the direction of fall. 1. On the side of the tree facing the direc2. tion of fall, make a single 90. cut through approximately 1/3 of the tree’s diameter. Working from the same side of the tree 3. and at a 45. angle to the first cut, make your second cut in an upward direction to remove a notch from the tree as shown. Working on the opposite side of the 4. tree and starting approximately 2” (5 mm) higher than the bottom of the notch created in steps 1-3. Set the bumper spike just behind the felling hinge. Use full throttle and bring the bar and 5. 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 breaker bar into the 6. cut as soon as it is deep enough. When the tree begins to fall, stop the 7. saw, and put it down on the ground. Use your retreat path to exit the area 8. quickly. 45° Direction Of Fall Escape Path WARNING! Always make your falling cut parallel to the bottom cut! An angled falling cut may cause the tree to split, possibly changing the direction of fall! 45° Bumper Spike NOTE: If the cut appears to be closing on the bar, use a mallet to drive one or two plastic or wooden wedges into the cut behind the bar. Direction of Fall Wooden Hinge Felling Cut Notch Bucking Second Cut (overbuck) WARNING! Always cut downed timber from the uphill side of the wood! Be alert for potential injury from rolling or shifting logs! Downed timber may shift or roll unpredictably during cutting or handling operations! CS_Bucking2_First Cut (underbuck) About 1/3 of Tree Diameter Techniques I¦¦f the log is well supported, start your cut from the top of the log. Keeping the guide bar parallel to the ground, cut straight down but do not allow the saw to cut into the ground. Cutting downed timber, or “bucking,” ¦¦ increases the possibility of the wood settling and pinching the guide bar. Driving one or more soft plastic or wooden bucking wedges can help prevent bar-pinching during a cut. Use two cuts when bucking near the ¦¦ inboard end of an unsupported log. Make the first cut as an overbuck approx1. imately 1/...
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