DeWalt D28112 Instruction Manual page 16

WARNING: Do not use edge grinding/cutting wheels for surface
grinding applications because these wheels are not designed for side
pressures encountered with surface grinding. Wheel breakage and
injury may result.
SURFACE FINISHING WITH SANDING FLAP DISCS (FIG. 14)
1. Allow the tool to reach full speed
before touching the tool to the
work surface.
2. Apply minimum pressure to work
surface, allowing the tool to
operate at high speed. Sanding
rate is greatest when the tool operates at high speed.
3. Maintain a 5˚ to 10˚ 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 laying it down.
MOUNTING SANDING BACKING PADS (FIG. 15)
CAUTION: Proper guard must be reinstalled for grinding wheel,
sanding flap disc, wire brush or wire wheel applications after sanding
applications are complete.
1. Place or appropriately thread
backing pad (Q) on the
spindle.
2. Place the sanding disc (R) on
the backing pad.
FIG. 14
5˚-10˚
R
FIG. 15 H
Q
15
3. While depressing spindle lock, thread clamp nut (H) on spindle,
piloting the raised hub on the clamp nut into the center of san ding
disc and backing pad.
4. Tighten the clamp nut by hand. Then depress the spindle lock
button while turning the sanding disc until the sanding disc and
clamp nut are snug.
5. To remove the wheel, grasp and turn the backing pad and
sanding pad while depressing the spindle lock button.
USING SANDING BACKING PADS (FIG. 16)
Choose the proper grit sandpaper for your application. Sandpaper
is available in various grits. Coarse grits yield faster material removal
rates and a rougher finish. Finer grits yield slower material removal
and a smoother finish.
Begin with coarse grit discs for fast, rough material removal. Move
to a medium grit paper and finish with a fine grit disc for optimal
finish.
Coarse
Medium
Fine Finishing
Very Fine Finishing
1. Allow the tool to reach full speed
before touching tool to the work
surface.
2. Apply minimum pressure to work
surface, allowing the tool to
operate at high speed. Sanding
rate is greatest when the tool
operates at high speed.
3. Maintain a 5˚ to 15˚ angle between the tool and work surface.
The san ding disc should contact approximately one inch of work
surface.
16 - 30 grit
36 - 80 grit
100 - 120 grit
150 - 180 grit
FIG. 16
5˚-15˚