Safety procedures and environmental care
Chainsaw maintenance (see Trim and crosscut felled trees)
Trimming and crosscutting (see Trim and crosscut felled trees)
Plus:
Basic tree falling
Assessing a tree and planning the falling procedure
Preparing an escape route
Cutting the scarf
Cutting the back-cut
Using wedges
Tree characteristics:
Tree diameter not more than 50 cm at position of cut
Tree height not more than 20 metres
Lean and weight distribution consistent with falling direction
Single leader and sound wood condition in barrel
Species and growth conditions not prone to twisting or splitting
Environmental conditions:
Ground slope not more than 15 degrees
Minimal canopy affecting tree fall
Wind not significantly affecting falling characteristics
Absence of ground growth or fallen trees that would prevent the free movement around stump or prevent a complete fall
Absence of stags and hazardous ground features in falling radius
Clear falling or sparse tree density
Intermediate tree falling
All of the above, plus:
Correct use of multiple wedges
Correct use of multiple back cuts
Tree characteristics:
Tree diameter not more than 80 cm at position of cut
Tree height not more than 40 metres
Lean and weight distribution which can be adapted to falling direction with the use of wedges and/or control with hinge wood
Single leader and sound wood condition in barrel
Environmental conditions:
Ground slope not more than 15 degrees
Moderate wind speed
Absence of ground growth or fallen trees that would prevent a complete fall
|