DeWalt D28490 Instruction Manual page 11

CAUTION: When using a grinding wheel with a type 27, 28 or 29
guard, be sure that the bottom surface of the grinding wheel is
inside the the guard lip.
MOUNTING AND REMOVING HUBBED WHEELS
Hubbed wheels install directly on the threaded spindle.
1. Thread the wheel on the spindle by hand, seating the wheel
against the mount.
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.
CAUTION: Failure to properly seat the wheel against the mount
before turning the tool on may result in damage to the tool or the
wheel.
MOUNTING NON-HUBBED WHEELS
90˚
Depressed center, Type 27 grinding wheels must be used with
90˚
available accessory flanges. See the charts on pages 5–7 of this
manual for more information.
H
G
E
1. Install the metal backing flange (G) on spindle (E) against the
mount.
2. Place wheel against the backing flange, centering the wheel on
the backing flange pilot.
3. While depressing the spindle lock button, thread the clamp nut
(H) on spindle, piloting the raised hub on clamp nut in the center
of grinding wheel.
4. Tighten the clamp nut with a wrench.
5. Reverse the above procedure to remove the wheel.
SURFACE GRINDING WITH GRINDING WHEELS
1. Allow the tool to reach full speed before touching tool to work
surface.
2. Apply minimum pressure to work surface, to allow the tool to
operate at high speed.
3. Maintain a 20˚ to 30˚ angle between the tool and work
surface.
4. Continuously move the tool in a forward and back motion to
avoid creating gouges in the work surface.
5. Remove the tool from work surface before turning tool off. Allow
the tool to stop rotating before setting it down.
EDGE GRINDING WITH GRINDING WHEELS
CAUTION: Wheels used for cutting and edge grinding may
break if they bend or twist while the tool is being used to do
cut-off work or deep grinding. To reduce the risk of serious injury,
limit the use of these wheels with a standard type 27 guard to
shallow cutting and notching (less than 1/2" in depth). The open
side of the guard must be positioned away from the operator. For
deeper cutting with a type 1 wheel, use a closed, type 1 guard.
Type 1 guards are available at extra cost from your local dealer or
authorized service center.
9