valutazioni - 5, GPA: 3.4 ( )

Produttore : Sears File Size : 3.34 mb File Nome : Lingua di insegnamento:

!5 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 carefuilyl 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 cutting and neverholdthe logwithyourlegorfoot. d. Give special attention to logs under strain to prevent the saw from pinching. Make the first cut Onthe compression side to relieve the stress on the log. (Figure 31) e. Do not cut in an area where logs, limbs and roots are tangled such as in a blown down area. Drag the logs intoa clear area before cutting by pulling out exposed and cleared togs .................................................................................... ................................................. 7first:............................................................................................ _ f."_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 the diameter of the log. 2. TYPES OF CUTTING USED Figure 32. --Overcutting -begin on the top side of the log with the spur against the log: exert light pressure downward. m Undercutting -begin on the under side of the log with the top of the saw against the log; exert light pressure upward. During undercutting, the saw will tend to push back at you. Be prepared for this reaction and hold the saw firmly to maintain control. WARNING! If saw becomes pinched or hungin a log, don't try to force it out. You could lose control of the saw resulting in personal injury and/or damage to the saw. Stop the saw and driveawedge ofplastic, wood orlight alloy into the cut until'saw can be removed easily. Figure 33. Do not use a Steel or iron wedge to avoid kickback and chain damage, 3. BUCKING--WITHOUT A SUPPORT a. Overcut with a 1/3 diameter cut. b. Roll log over and finish with an ovemut. . BUCKING --USING ANOTHER LOG AS A SUPPORT (Figure 34): WARNING! Do not stand on the log being cut. The cut portion will roll down hill. a. In areaA: 1.) Undercut 1/3 of the way through the log. 2.) Finish With an overcut. b. In area B: 1.) Overcut, 1/3 of the waythrough the log. 2.) Finish with an undercut. 16 OVERCUT ANOTHER WARNING! Never turn the sawupside down to undercut, The saw cannot be controlled in this position. 1ST CUT PRESSU RE SIDE ..--_ 2NDCUT Figure 31 _ ...... UNDERCUT Figure32 WEDGE USED TO HOLD CUT OPEN / i / Figure 33 --.'_:?--__ LOG AS A SUPPORT "_ Figure 34 5. BUCKING w USING A STAND (Figure 35): In areaA: 1.) Undercut 1/3 of the way through the log. 2.) Finish with an overcut. a. b. In area B: 1.) Overcut 1/3 of theway through the log. 2,) Finish with an undercut. D. DEBRANCHING ANDPRUNING II,:.i: • Work slowly, keeping both hands on the saw =with a firm grip. Maintain secure footing and balance, • Watch out for springpoles. Use extreme caution ........................................... .=when-cutting-smalt-size-timbs:--SlendeF_materiat may catch the saw chain andbe whipped toward ' -you or,pult you off balance. ' , eBe alert for sPringback. Watch.out for branches that are bent or under pressure as youare cutting to avoid being struck by the branch or the saw when the tension in the wood fibers is released, • Keep a clear work area. Frequently clear branches out of the way to avoid tripping over them. 1. DEBRANCHING Limit debranching to limbs shoulder height or below. Always debranch a tree , 'after it isCut down. Only then can debranching bedone safely and properly. b. Leave the larger lower limbs to support the _ :tree asyou work: c. Start at the base of the felled tree and work towards the top,_ cutting branches and , . _ . :limbs. Remove small timbswith one cut. Fig= ure36. d. Keep the tree between you and the chain. Cut _from .the side of the tree opposite the branch youare cutting. ,= eo Remove larger, supporting branches with the1!3, 2/3 cutting techniques described in .... the bucking section. == ...... 1.) Start with an overcut 2,) Finish with an overcut f. Always =use an overcut to cut small and freely hanging limbs. Undercutting could .... cause imbs to fall and pinc h the saw. 2. PRUNING " a. Limit pruning to limbs shoulder height or :.... below. Do not cut if branches are higher than your shoulder. Get a professional to do the ijob_ : b. Refer to Figure 37 for the pruning technique. _: 1,) Undercut 1/3 of the waythrough the limb : near the trunk ofthe tree. 2.) Finish with an 0vercut farther Outfrom the ' trunk. : : _ .... '_: 3.) Keep out of the way of the fall!ng limb. 4.) Cut thestump flush near the trunk of the tree. '' :: ' ":.... 2ND CUT 1ST CUT 2ND CUT FIRST CUT CUT CUT Figure 35 WARNING! Never climb int0a tree to debranch or prune_ Do not stand on ladders, platforms, a log or inany positionwhich might c...

Scarica la tua

Per scaricare, digitare 2 cifre :