DeWalt DWE4120 Instruction Manual page 55

Mounting and Using Depressed Center
Grinding Wheels and Sanding Flap Discs
MOUNTING AND REMOVING HUBBED
WHEELS
Hubbed wheels install directly on the 5/8"–11
threaded spindle or M14 depending on the
spindle of the tool. Thread of accessory must
match thread of spindle.
1. Remove backing flange (D) by pulling
away from the tool.
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.
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. 9)
Depressed center Type 27 grinding wheels
must be used with included flanges. Refer
to Accessories and Attachments for more
information.
1. Install the backing flange (D) on spindle (B)
with the raised section (pilot) against the
wheel. Be sure the backing flange recess
is seated onto the flats 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
FIG. 9
(E) on spindle. If the wheel you are installing is more than 1/8"
(3.31 mm) thick, place the threaded clamp nut on the spindle so
D
that the raised section (pilot) fits into the center of the wheel. If
the wheel you are installing is 1/8" (3.31 mm) thick or less, place
B
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
E
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
1/4" WHEELS
height of the pilot prevents the clamp nut from holding the wheel.
(6.35 mm)
SURFACE GRINDING WITH GRINDING WHEELS (FIG. 10)
1. Allow the tool to reach full speed before touching the tool to the
Clamp Nut
work surface.
2. Apply minimum pressure to the work surface, allowing the tool
to operate at high speed. Grinding rate is greatest when the tool
Backing Flange
operates at high speed.
3. Maintain a 20˚ to 30˚ angle between the
1/8" WHEELS
tool and work surface.
(3.31 mm)
4. Continuously move the tool in a forward
and back motion to avoid creating
Clamp Nut
gouges in the work surface.
5. Remove the tool from work surface before turning tool off. Allow
the tool to stop rotating before laying it down.
Backing Flange
53
FIG. 10
20˚–30˚