SAFETY MEETING. CHAIN SAW SAFETY. The safe felling of a tree includes making three precise and strategic cuts. The top cut is the first of two cuts that result in a V-shaped notch. The notch is made on the side of the tree that you want it to fall. The Correct Cut
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CHAIN SAW SAFETY
three precise and strategic cuts.
The top cut is the first of two cuts that result in a V-shaped notch. The notch is made on the side of the tree that you want it to fall.
The Correct Cut
1.Starting PointImportant -- begin at any height as long as you allow enough room for the undercut
2. Angle of AttackImportant -- cut downward at an angle of 70 degrees
3. Ending PointStop when the cut reaches ¼ to 1/3 of the trunk's diameter or when the cut reaches 80% of the tree's diameter at chest level
Here the top cut is not
steep enough . . .
. . . resulting in a notch of
less than 70 degrees
The Bottom or UndercutThe undercut is the second of two cuts that result in a V-shaped notch. The notch is made on the side of the tree facing the direction that you want it to fall.
The Correct Cut
1.Starting PointVery Important -- begin at the level that will create at least a 70 degree notch opening
2. Angle of AttackImportant -- cut upward at a 20-degree angle
3. Ending PointVery important -- stop when the cut reaches the end point of the face cut
The Back CutThe back cut is the third and final cut and is made on the opposite side of the notch. The back cut disconnects almost all of the tree from the stump leaving a hinge that helps to control the tree's fall.
The Correct Cut
1.Starting PointImportant - begin on the opposite side of the notch at the same level as the notched corner
2. Angle of AttackImportant - cut flat along a horizontal plane
3. Ending PointVery important - stop at the point that will leave a hinge width that is 1/10 the tree's diameter
This is the simplest of all back cuts. Other back-cutting
techniques may be required for felling difficult trees.
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