Very brief comments on the principle of felling a tree using an upright scarf and back cut

2016年11月22日 · This video covers scarf and back cut chainsaw techniques used to fall a tree. It is an excerpt from Module 2 Section 5 of the Chainsaw Operation interactive ...

The scarf—the portion of the tree removed by chopping—should have its widest point in the desired felling direction. The height of the scarf should be about the same as the diameter of the tree (i.e., 12-inch-tall scarf for a 12-inch-diameter tree).

2023年2月17日 · The initial step in felling a tree is the directional cut, also known as a scarf cut - this cut is made on the side of the tree where it is intended to fall. The scarf cut is made up of two cuts, a 45-degree angle cut and a straight bottom cut.

* Covers basic tree felling, intermediate tree felling and advanced tree felling including hazardous trees * Theory of felling, directional felling, preparation, escape route and cutting the scarf * Builds on the information provided by the Chainsaw Operator’s Manual

Intermediate tree felling covers trees with single or multiple stems, limited defects, and lean and weight distribution that can be adapted to felling direction. Advanced tree felling applies to larger and more complex trees and includes trees deemed to be more hazardous.

Basic tree felling applies to trees that are relatively small, with a single stem and no defects. Intermediate tree felling covers trees with single or multiple stems, limited defects, and lean and weight distribution that can be adapted to felling direction.

Observe felling danger zones by keeping a safe distance (two tree lengths or more if necessary) between yourself, others, and equipment. Prepare the felling area by clearing debris and obstacles from the base of the tree, establishing an escape route, …

Tree felling is one of the most dall89rous operations in the forest and accounts for many fatal accidents. Cross cutting and log trimming also cause accidents of a serious nature.

In a tree with a considerable lean, the scarf should be cut deeper into the tree to prevent it splitting up the trunk when it commences to fall. The backcut should be as level as possible and two to three inches above the bottom of the scarf.