Ryobi RY40570 Operation Manual - Page 21
Warning, Bucking
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OPERATION Notched Undercut. Cut a notch about 1/3 the diameter of the tree, perpendicular to the direction of fall. Make the cuts of the notch so they intersect at a right angle to the line of fall. This notch should be cleaned out to leave a straight line. To keep the weight of the wood off the saw, always make the lower cut of the notch before the upper cut. See Figure 15. Felling Backcut. The backcut is always made level and horizontal, and at a minimum of 2 in. above the horizontal cut of the notch. See Figures 15 - 16. Never cut through to the notch. Always leave a band of wood between the notch and backcut (approximately 2 in. or 1/10 the diameter of the tree). This is called "hinge" or "hingewood." It controls the fall of the tree and prevents slipping or twisting or shoot-back of the tree off the stump. See Figures 15 - 16. On large diameter trees, stop the back cut before it is deep enough for the tree to either fall or settle back on the stump. Then insert soft wooden or plastic wedges into the cut so they do not touch the chain. The wedges can be driven in, little by little, to help jack the tree over. See Figure 17. NOTE: When bucking or felling with a wedge, it may be necessary to remove the SAFE-T-TIP® anti-kickback nose guard to allow the bar to be drawn through the cut. After the cut is complete, the tip should be reinstalled immediately. As tree starts to fall, stop the chain saw and put it down immediately. Retreat along the cleared path, but watch the action in case something falls your way. Be alert for overhead limbs or branches that may fall and watch your footing. WARNING: Never cut through to the notch when making a backcut. The hinge controls the fall of the tree, this is the section of wood between the notch and backcut. BUCKING See Figures 18 - 21. Bucking is the term used for cutting a fallen tree to the desired log length. Always make sure your footing is secure and your weight is distributed evenly on both feet. 21 - English LOG SUPPORTED AT ONE END: FINISHING CUT LOAD Fig. 19 1ST CUT 1/3 DIA LOG SUPPORTED AT BOTH ENDS: LOAD 1ST CUT 1/3 DIA FINISHING CUT OVERBUCKING Fig. 20 UNDERBUCKING Fig. 21
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