10
Pushback:
Pushback occurs when the chain
on
the top of the bar
is
suddenly stopped and the reaction drives the saw straight
back toward the operator causing loss of saw control. It
most frequently occurs when the top of the chain is pinched
or caught
in
the cut or contacts a foreign object when the
top of the bar is used for cutting.
To
avoid pushback:
1.
Be alert to forces or situations that may cause material
to
pinch the top of the chain.
2.
Do not cut more than one log
at
a time.
3. Do not twist the saw when withdrawing the bar from a
plunge cut or under buck because the chain can catch.
Pull-in:
Pull-in occurs when the bottom of the chain
is
suddenly
stopped. The bottom of the chain stops when it is pinched,
caught or encounters a foreign object
in
the wood. The
reaction of the chain pulls the saw forward, causing the
operator to lose control. Pull-in frequently occurs when the
bumper spike of the saw is not held securely against the
tree or limb and when the chain is not rotating at full speed
before it contacts the wood.
To
avoid pull-in, always start a cut with the chain rotating
at
full speed and the bumper spike
in
contact with the
material. Pull-in
may also be prevented by using wedges
to open the kerf or cut.
To
best counter any reactive forces, always maintain
proper balance, secure footing, a firm grip
on
the saw
and
watch what and where you are cutting.
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