Lower Blade Guard - DeWalt DC390 Instruction Manual

LOWER BLADE GUARD

WARNING: The lower blade guard is a safety feature which
reduces the risk of serious personal injury. Never use the saw
if the lower guard is missing, damaged, misassembled or not
working properly. Do not rely on the lower blade guard to protect
you under all circumstances. Your safety depends on following
all warnings and precautions as well as proper operation of
the saw. Check lower guard for proper closing before each
use as outlined in Additional Safety Rules for Circular Saws.
If the lower blade guard is missing or not working properly,
have the saw serviced before using. To assure product safety
and reliability, repair, maintenance and adjustment should be
performed by an authorized service center or other qualified
service organization, always using identical replacement parts.
Blades
WARNING: To minimize the risk of eye injury, always use eye
protection. Carbide is a hard but brittle material. Foreign objects in
the work piece such as wire or nails can cause tips to crack or break.
Only operate saw when proper saw blade guard is in place. Mount
blade securely in proper rotation before using, and always use a clean,
sharp blade.
CAUTION: Do not cut ferrous metals (steel), masonry, glass,
masonry-type planking, cement board or tile with this saw.
Do not use abrasive wheels or blades. A dull blade will cause slow,
inefficient cutting overload on the saw motor, excessive splintering,
and could increase the possibility of kickback. Please refer to the table
on next page to determine the correct size replacement blade for your
model saw.
Blade Diameter
DW9155 6-1/2"
DW9154 6-1/2"
DW9153 6-1/2"
If you need assistance regarding blades, please call 1-800-4-D
(1-800-433-9258).
KICKBACK
Kickback is a sudden reaction to a pinched, bound or misaligned saw
blade, causing an uncontrolled saw to lift up and out of the workpiece
toward the operator. When the blade is pinched or bound tightly by the
kerf closing down, the blade stalls and the motor reaction drives the
unit rapidly back toward the operator. If the blade becomes twisted or
misaligned in the cut, the teeth at the back edge of the blade can dig
into the top surface of the wood causing the blade to climb out of the
kerf and jump back toward the operator.
Kickback is more likely to occur when any of the following conditions
exist.
1. IMPROPER WORKPIECE SUPPORT
A. Sagging or improper lifting of the cut off piece can cause
pinching of the blade and lead to kickback (Fig. 10).
B. Cutting through material supported at the outer ends only can
cause kickback. As the material weakens it sags, closing down
the kerf and pinching the blade.
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.
14
Teeth Application
18 General Purpose Cutting
24 Smooth Wood Cutting
90 Non-carbide, Plywood/
Vinyl Siding Cutting
WALT
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