DeWalt DCS391 Guide D'utilisation page 17

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 kerf 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 one-half of a tooth as shown in Figure 7. This
allows the shoe 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. Overreaching 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 kerf. Worn blades may
also have insufficient body clearance which increases the chance
of binding and increased loading.
6. LIFTING THE SAW WHEN MAKING A BEVEL CUT
Bevel cuts require special operator attention to proper cutting
techniques – especially guidance of the saw. Both blade angle to
the shoe 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 kerf. 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 Further Safety Instructions for All Saws and Blades
for procedures and techniques that will minimize the occurrence of
kickback.
Cutting Depth Adjustment (Fig. 6, 7)
1. Hold the saw firmly and loosen (clockwise) the depth adjustment
knob (D) and move shoe to obtain the desired depth of cut.
2. Make sure the depth adjustment knob has been retightened
(counterclockwise) before operating saw.
For the most efficient cutting action, set the depth adjustment so that
one-half tooth of the blade will project below the material to be cut.
This distance is from the tip of the tooth to the bottom of the gullet in
front of it. This keeps blade friction at a minimum, removes sawdust
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