DeWalt DCG412 Instruction Manual page 69

NOTICE: To reduce the risk of damage to the tool, do not engage the
spindle lock button while the tool is operating. Damage to the tool will
result and attached accessory may spin off possibly resulting in injury.
To engage the lock, depress the spindle lock button (C) and rotate the
spindle until you are unable to rotate the spindle further.
Mounting and Using Depressed Center
Grinding Wheels and Sanding Flap Discs
CAUTION: Always use the correct guard per the instructions in
this manual.
MOUNTING AND REMOVING HUBBED WHEELS
WARNING: To reduce the risk of serious personal injury, turn tool
off and remove the battery pack before making any adjustments
or removing/installing attachments or accessories. An accidental
start-up can cause injury.
Hubbed wheels install directly on the 5/8"–11 (B3) & M14 (AR, B2, B2C,
BR) threaded spindle.
1. Thread the wheel on the spindle by hand.
2. Depress the spindle lock button and use a wrench to tighten the hub
of the wheel.
3. Reverse the above procedure to remove the wheel.
NOTICE: Failure to properly seat the wheel before turning the tool on
may result in damage to the tool or the wheel.
MOUNTING NON-HUBBED WHEELS
(FIG. 2, 9–10)
WARNING: To reduce the risk of serious
personal injury, turn tool off and remove the
battery pack before making any adjustments
or removing/installing attachments or
accessories. An accidental start-up can cause
injury.
Depressed center Type 27 and Type 42
grinding wheels must be used with included
flanges. See pages 63 and 64 of this manual
for more information.
1. Install the unthreaded backing flange (G) on spindle (D) with the
raised section (pilot) against the wheel.
2. Place wheel against the backing flange, centering the wheel on the
raised section (pilot) of the backing flange.
3. While depressing the spindle lock button (C), thread the locking
flange (H) on spindle. If the wheel you are installing is more than 1/8"
(3.17 mm) thick, place the threaded locking flange on the spindle so
that the raised section (pilot) fits into the center of the wheel. If the
wheel you are installing is 1/8" (3.17 mm) thick or less, place the
threaded locking flange on the spindle so that the raised section
(pilot) is not against the wheel. Refer to Figure 10A and 10B.
4. While depressing the spindle lock button, tighten the threaded
locking flange with a wrench.
5. To remove the wheel, depress the spindle lock button and loosen the
threaded locking flange with a wrench.
FIG. 9
NOTE: If the wheel spins after the threaded locking flange is tightened,
G
check the orientation of the threaded locking flange. If a thin wheel is
D installed with the pilot on the locking flange against the wheel, it will spin
because the height of the pilot prevents the locking flange from holding
the wheel.
SURFACE GRINDING WITH GRINDING WHEELS (FIG. 11)
1. Allow the tool to reach full speed before touching the tool to the work
surface.
H
67
FIG. 10A FIG. 10B
Wheels thicker than Wheels 1/8" (3.17 mm)
1/8" (3.17 mm)
threaded locking
flange
backing flange
and thinner
threaded locking
flange
backing flange