DeWalt D28106 Instruction Manual page 9

SPINDLE LOCK
The spindle lock (C) is provided to prevent the spindle
from rotating when installing or removing wheels.
Operate the spindle lock only when the tool is turned
off, unplugged from the power supply, and has come to
a complete stop. Do not engage the spindle lock while
the tool is operating because damage to the tool will
result. To engage the lock, depress the spindle lock
button and rotate the spindle until you are unable to
rotate the spindle further.
Mounting and Using Depressed Center Grinding Wheels and
Sanding Flap Discs
MOUNTING AND REMOVING HUBBED WHEELS
CAUTION: Turn off and unplug the tool before making any adjustments or
removing or installing attachments or accessories. Before reconnecting the tool,
depress and release the paddle switch to ensure that the tool is off.
Hubbed wheels install directly on the 14M2 threaded spindle. Thread of accessory
must match thread of spindle.
1. Backing flange is retained to the grinder by an O-ring on the spindle. Remove
backing flange by pulling and twisting flange away form the machine.
2. Thread the wheel on the spindle by hand.
3. Depress the spindle lock button and use a wrench to tighten the hub of the
wheel.
4. Reverse the above procedure to remove the wheel.
CAUTION: 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
CAUTION: Turn off and unplug the tool before
making any adjustments or removing or installing
attachments or accessories. Before reconnecting the
tool, turn the switch on and off as previously
described to ensure that the tool is off.
Depressed center Type 27 grinding wheels must be used with included flanges. See
page 6 of this manual for more information.
1. Install the unthreaded backing flange (G) on spindle (D) with the raised section
(pilot) against the wheel. Be sure the backing flange recess is seated onto the flats
C
of the spindle by pushing and twisting the flange before placing 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, thread
the clamp nut (H) on spindle. If the wheel you are
installing is more than 3.2 mm (1/8") thick, place
the threaded clamp nut on the spindle so that the
raised section (pilot) fits into the center of the
wheel. If the wheel you are installing is 3.2 mm
(1/8") thick or less, place the threaded clamp nut
on the spindle so that the raised section (pilot) is
not against the wheel.
4. While depressing the spindle lock button, tighten
the clamp nut with a wrench.
5. To remove the wheel, depress the spindle lock
button and loosen the threaded clamp nut with a
wrench.
NOTE: If the wheel spins after the clamp nut is
tightened, check the orientation of the threaded
clamp nut. If a thin wheel is installed with the pilot
on the clamp nut against the wheel, it will spin
because the height of the pilot prevents the clamp
nut from holding the wheel.
SURFACE GRINDING WITH GRINDING WHEELS
G
1. Allow the tool to reach full speed before touching
the tool to the work surface.
2. Apply minimum pressure to the work surface,
allowing the tool to operate at high speed.
D
Grinding rate is greatest when the tool operates at
high speed.
3. Maintain a 20˚ to 30˚ angle between the tool and
work surface.
8
H
6.35 mm WHEELS
(1/4")
Clamp Nut
Backing Flange
3.2 mm WHEELS
(1/8")
Clamp Nut
Backing Flange
20˚-30˚