Dewalt DCG412B Instruction Manual - Page 20

Surface Grinding With Grinding Wheels, Edge Grinding With Grinding Wheels

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English Depressed center Type 27 grinding wheels must be used with included flanges. See pages 14 and 15 of this manual for more information. 1. Install the unthreaded backing flange (G) FIG. 9 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 G (pilot) of the backing flange. D 3. While depressing the spindle lock button, thread the clamp nut (H) on spindle. If the wheel you are installing is more than 1/8" (3.17 mm) 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 H are installing is 1/8" (3.17 mm) 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. FIG. 10A FIG. 10B 1/4" (6.35 mm) WHEELS 1/8" (3.17 mm) WHEELS Clamp nut Clamp nut Backing flange Backing flange 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 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. Grinding rate is greatest when the tool operates at high speed. 3. Maintain a 20° to 30° angle between FIG. 11 the tool and work surface. 4. Continuously move the tool in a forward and back motion to avoid creating gouges in the work surface. 20˚-30˚ 5. Remove the tool from work surface before turning tool off. Allow the tool to stop rotating before laying it down. EDGE GRINDING WITH GRINDING WHEELS WARNING: Wheels used for cutting and edge grinding may break or kickback 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" [13 mm] in depth). The open side of the guard must be positioned away from the operator. For deeper cutting with a Type 1 cut-off wheel, use a closed Type 1 guard. Refer to pages 14 and 15 for more information. 1. Allow the tool to reach full speed before touching the tool to the work surface. 18

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English
18
Depressed center Type 27 grinding wheels must be used with
included flanges. See pages 14 and 15 of this manual for more
information.
1. Install the unthreaded backing flange (G)
H
D
G
FIG. 9
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, thread the clamp nut (H) on
spindle. If the wheel you are installing is
more than 1/8" (3.17 mm) 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 1/8" (3.17 mm) 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.
1/8" (3.17 mm)
WHEELS
Backing flange
Clamp nut
FIG. 10B
1/4" (6.35 mm)
WHEELS
Backing flange
Clamp nut
FIG. 10A
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
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. Grinding rate is greatest when the tool
operates at high speed.
3. Maintain a 20° to 30° angle between
FIG. 11
20˚–30˚
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.
EDGE GRINDING WITH GRINDING WHEELS
WARNING
: Wheels used for cutting and edge grinding may break
or kickback 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" [13 mm] in depth). The open side
of the guard must be positioned away from the operator. For deeper
cutting with a Type 1 cut-off wheel, use a closed Type 1 guard. Refer
to pages 14 and 15 for more information.
1. Allow the tool to reach full speed before touching the tool to the
work surface.