Some lifting capacity of the felling wedge is lost because the wedge must first fill the thickness of the saw kerf before it can begin to lift the tree. For example, one foot DBH with a height of 70 feet has 70 segments. For example, a tree with a 6 inch base that is 70 feet tall would have 140 segments (70' divided by 1/2') and a tree that is 1 1/2 feet in diameter and 70 feet tall would have 46 segments (70' divided by 1.5').Īpproximate back lean that can be handled using a felling wedgeĪ simple precut rule-of-thumb method is to divide the height of the tree by the diameter breast high (DBH). Trees of the same height with narrower diameters will have more segments and therefore, can be wedged further that a larger diameter tree of the same height. Therefore, a tree with 70 segments will move 70 inches with one inch of lift at the stump. We know that lifting the bottom of a segment one inch moves the top of that same segment one inch over. For example, a tree with a base of 1 foot that is 70 feet tall has 70 segments (70' divided by 1') To calculate the total number of segments, divide the total height of the tree by the dimension of one segment. This distance, measured in feet, forms the sides of the square for a segment in that tree. A segment is a square with sides that are equal to the distance measured on the stump of the tree, from the front of the hinge, to the back of the tree. To calculate the effectiveness of a wedge on any tree we use the concept of segments. Segments - Loggers must know if trees with back lean can be successfully felled using wedges.
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