Stihl MS 310 Product Instruction Manual - Page 21
Open-face technique, Making sapwood cuts, D = Felling cut
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English / USA D 001BA150 KN 001BA144 KN D Open-face technique C = felling notch - determines the direction of the fall For an open-face cut: : Properly place felling notch perpendicular to the line of fall, close to the ground. : Cut down at approx. 50-degree angle to a depth of approx.1/5 to 1/4 of the trunk diameter. : Make second cut from below at approx. 40 degree angle. : Remove resulting 90-degree piece. Making sapwood cuts : For medium sized or larger trees make cuts at both sides of the trunk, at same height as subsequent felling cut. : Cut to no more than width of guide bar. This is especially important in softwood in summer - it helps prevent sapwood splintering when the tree falls. D = Felling cut Conventional and open-face technique: : Begin 1 to 2 inches (2,5 to 5 cm) higher than center of felling notch. : Cut horizontally towards the felling notch. : Leave approx.1/10 of diameter uncut. This is the hinge. : Do not cut through the hinge - you could lose control of the direction of the fall. 20 MS 290, MS 310, MS 390