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C. Cutting off a cantilevered or overhanging
piece of material
from the bottom up in a vertical direction can cause kickback.
The falling cut off piece can pinch the blade.
D. Cutting off long narrow strips (as in ripping) can cause
kickback. The cut off strip can sag or twist closing the ken' and
pinching the blade.
E. Snagging the lower guard on a surface below the material
being cut momentarily
reduces operator control. The saw
can lift partially out of the cut increasing the chance of blade
twist.
2. IMPROPER DEPTH OF CUT SETTING ON SAW
To make the most efficient cut, the blade should protrude only
far enough to expose half of a tooth as shown in Figure 5. This
allows the foot plate to support the blade and minimizes twisting
and pinching in the material. See the section titled Cutting
Depth Adjustment.
3. BLADE TWISTING (MISALIGNMENT
IN CUT)
A. Pushing harder to cut through a knot, a nail, or a hard grain
area can cause the blade to twist.
B. Trying to turn the saw in the cut (trying to get back on the
marked line) can cause blade twist
C.Over-reaching
or operating the saw with poor body control
(out of balance), can result in twisting the blade.
D. Changing hand grip or body position while cutting can result
in blade twist.
E. Backing up the saw to clear blade can lead to twist.
4. MATERIALS THAT REQUIRE EXTRA ATTENTION
A. Wet lumber
B. Green lumber (material freshly cut or not kiln dried)
C. Pressure treated lumber (material treated with preservatives
or anti-rot chemicals)
5. USE OF DULL OR DIRTY BLADES
Dull blades cause increased loading of the saw. To compensate,
an operator will usually push harder which further loads the
unit and promotes twisting of the blade in the ken`.Worn blades
may also have insufficient body clearance which increases the
chance of binding and increased loading.
6. LIFTING THE SAW WHEN MAKING BEVEL CUT
Bevel cuts require special operator attention to proper cutting
techniques - especially guidance of the saw. Both blade angle to
the foot plate and greater blade surface in the material increase
the chance for binding and misalignment (twist) to occur.
7. RESTARTING
A CUT WITH THE BLADE TEETH JAMMED
AGAINST THE MATERIAL
The saw should be brought up to full operating speed before
starting a cut or restarting a cut after the unit has been stopped
with the blade in the ken`. Failure to do so can cause stalling and
kickback.
Any other
conditions
which
could result
in pinching,
binding,
twisting, or misalignment
of the blade could cause kickback. Refer
to the sections on adjustments
and operation for procedures and
techniques that will minimize the occurrence of kickback.
Workpiece
Support
(Fig.
13-15)
WARNING:
It
is
FIG. 13
important
to support
the work properly and
to hold the saw firmly
to prevent
loss
of
control
which
could
cause personal injury.
Figure
13 illustrates
proper
hand support
of the saw. Maintain a
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