FELLING OF TREES

Submitted to: Submitted by:

Divya mam Md mahmood

12011BB006

Fsp II sem

Jnafau & spa

FELLING IS THE PROCESS OF DOWNING INDIVIDUAL TREES, AN

ELEMENT OF THE TASK OF LOGGING.

Methods:-

1 Feller buncher :- A feller buncher is a motorized vehicle with an

attachment which rapidly cuts and gathers several trees in the process

of felling them.

In cut-to-length logging a harvester performs the tasks of a feller

buncher additionally doing the delimbing and bucking of the trees as

well.

2 Hand felling :- In hand felling, an axe, saw, or chainsaw is used to

drop a tree, followed up by limbing, bucking, and in traditional

applications . In the modern commercial logging industry, felling is

typically followed by limbing and skidding

FELLER BUNCHER

A feller buncher is a type of harvester used in logging. It is a motorized

vehicle with an attachment that can rapidly cut and gather several trees

before felling them.

Older style Feller buncher tree cutting machine . Front view of a feller buncher.

A feller buncher consists of a standard heavy equipment base with a tree-grabbing device furnished with a chain-saw, circular saw or a shear - a pinching device designed to cut small trees off at the base. The machine then places the cut tree on a stack suitable for a skidder or forwarder, or other means of transport (yarding) for further processing (e.g., delimbing, bucking, loading, or chipping).

Closeup hard wood grabbing device, with chainsaw for felling trees

There are also wheeled feller bunchers with no articulated arm. Instead this type of vehicle drives close and grabs the tree.

In cut-to-length logging a harvester performs the tasks of a feller buncher additionally doing the delimbing and bucking of the trees as well.

HARVESTER

A harvester is a type of heavy forestry vehicle employed in cut-to-length

logging operations for felling, delimbing and bucking trees. A forest

harvester is typically employed together with a forwarder that hauls

the logs to a roadside landing.

6-wheeled Valmet harvester Small 4-wheeled Rottne harvester

Harvester head. Harvester head, chainsaw visible.

Harvester consists of :-

1 Chain saw .

2 Two or more curved delimbing knives .

3 Two feed rollers to grasp the tree.

4 Diameter sensors to calculate the volume of timber harvested in conjunction with

a measuring wheel which measures the length of the stem as it is fed through the head.

HAND FELLING:-

In hand felling, an axe, saw, or chainsaw is used to drop a

tree, followed up by limbing, bucking, and in traditional

applications . In the modern commercial logging

industry, felling is typically followed by limbing and skidding.

CHAINSAW FELLING AND BUCKING: PLANNING AND OPERATIONAL

FACTORS/VARIABLES

Felling Pattern

Perpendicular

Herringbone

Contour

CHAINSAW FELLING AND BUCKING: PLANNING AND OPERATIONAL

FACTORS/VARIABLES

Terrain

CHAINSAW FELLING AND BUCKING: PLANNING AND OPERATIONAL

FACTORS/VARIABLES

Tree Lean and Weight Distribution

CHAINSAW FELLING AND BUCKING: PLANNING AND OPERATIONAL

FACTORS/VARIABLES

Stage Felling and Skidding

CHAINSAW FELLING: THE PROCESS

Choose the lay of the tree

Clear brush and identify an

escape route from the tree

(OR-OSHA: 20-25’ @ 45 angle)

Undercut or Face cut

Backcut

Wedging & Holding Wood (hinge)

TREE PROCESSING: CHAINSAW CONSIDERATIONS

Measure the whole tree before starting the bucking

TREE PROCESSING: CHAINSAW CONSIDERATIONS

Tree lay creates compression

and tension wood

“Top, bottom and side binds”