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15
BUCKING: PROCEDURE
Cutting Logs Under Stress
When logs are supported on one or both ends, the wood tends to
bend during the cutting process. This can cause the chain saw to
become pinched between the two sides. Pay extra attention.
1. Make the first cut approximately 1/3 the diameter of the log. Do
not cut deeper than 1/3.
• If the log is supported on one end (Fig. 17), make the first cut
from below (underbucking). Refer to Underbucking.
• If the log is supported on two ends (Fig. 18), make the first cut
from above (overbucking). Refer to Overbucking.
2. Make the second cut from the opposite side until the two cuts meet.
If the diameter of the wood is large enough, insert soft plastic or
wooden wedges to hold the cut open and prevent pinching (Fig. 21).
Take care not to touch the wedges with the saw chain.
Cutting Fully-Supported Logs
When logs are supported along the entire length, extra care should
be taken to make sure the saw chain does not contact the ground or
other support structure (Fig. 19).
1. Cut through the log as much as possible, without cutting into the
ground or support structure. Cut from above (overbucking). Refer
to Overbucking.
2. Roll the log over and finish cutting through the log from above
(overbucking).
Overbucking
1. Begin cutting from above, with the bottom of the saw chain
against the top of the log (Fig. 19).
2. Exert light, downward pressure. The saw will tend to pull away
from the operator. Be prepared and hold the saw firmly to
maintain control.
Underbucking
1. Begin cutting from below, with the top of the saw chain against
the bottom of the log (Fig. 20).
2. Exert light, upward pressure. The saw will tend to push toward the
operator. Be prepared and hold the saw firmly to maintain control.
DANGER:
Use extreme caution when cutting a fallen
tree that is still attached to the root structure. When the
trunk is separated from the roots, the stump has a high
potential for rocking back into the hole created by the roots.
This can result in serious injury or death. Never stand in the
hole left by the roots. Never allow others to stand near the
root structure.
Fig. 18
Fig. 19
Overbucking
Fig. 20
Underbucking
Log Supported
Two Ends
First Cut (1/3 Diameter)
Second Cut
Load
Fig. 21
Wedge
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