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and shape center hole for mounting on the saw spindle. Always
assure that the maximum recommended speed (rpm) on the saw
blade meets or exceeds the speed (rpm) of the saw.
5. Follow steps 2 through 6 under To Install the Blade, making sure
that the blade will rotate in the proper direction.
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.
WARNING: Under certain conditions of use, metal chips may
become imbedded in the surfaces of the lower guard, causing
the lower guard to rub against the upper guard. Check the
operation of the lower guard before each use and remove any
imbedded chips.
Blades
WARNING: To minimize the risk of eye injury, always use eye
protection. Carbide is a hard but brittle material. Foreign objects in
the workpiece 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.
Blade
Diameter
DWA7770 5-1/2" (140 mm)
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 material 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
exists.
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. 9).
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 (Fig. 9).
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 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.
15
Teeth
Application
30
General purpose ferrous
metal cutting
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