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Spindle Lock Button; Depressed Center Wheels; Sanding Discs; Maintenance - DeWalt DW474 Instruction Manual

7" angle grinder

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Auxiliary llandle
(FIG.
3l
An auxiliary handle
is
fumished with your grinder and can be installed
on either side
of
the front housing, as shown in Figure
3.
This handle
SHOULD BE USED AT ALL TIMES to maintain complete control of
the tool.
Spindle Lock Button (FtG. 3)
Turn
off
and unplug grinder.
ln order
to
prevent the spindle of the tool
lorm
rotating while installing
or
removing accessories,
a spindle lock button has been
provided
in
the gear
head
of the
machine,
as shown
in
Figure
4. To
lock the
spindle, depress
and
hold
the
lock button. NEVER
DEPRESS THE
LOCK BUTTON WITH THE TOOL RUNNING OR COASTING.
Sanding
Discs
(FIG, 4)
NOTE: The guard need not be used with sanding discs.
TO
INSTALL SANDING
DISCS:
Be sure that the
tool
is unplugged. Push
the
hub of the clamp washer
through the center
oI
the sanding disc, as far as
it
will go, and also through
ûre backing disc.
Pr.i
the
backing hub on the tool spindle.
lnstall
the clamp
washer on the tool spindle and thread the assembly clockwise,
completeÿ
down
on
the spindle.
Engaç
the
lock
button.
When
using
a
sanding
disc,
hold
the tool so that an angle
of
10'to
15"
exists
beùreen the
disc and the
work.
lf
onÿ
the
outer edge of the
disc
is
used
a
rough
crÎ
surlace will
result.
lf the disc is
pressed
flat
against the
work the surface will be inegular and bumpy, and the tool will be difficult
to
control.
See page
7 for a
æmplete
descripüon of usage and mounüng altematives.
Removing Disc (FIG.
5l
Using
a
cloth
or
glove
to
protect
your hand, turn the disc
assembly
counterclockwise
to
remove
it
from the tool spindle. Engage lock button.
Depressed Center Wheels (FtG. 6t
Depressed center wheels may be used
lor
moderate metal removal on
flat or contoured surfaces.
CAUTION: Never use depressed center wheels without
the
proper
guard. TO INSTALL DEPRESSED CENTER WHEELS:
1. Be
sure tool
is
disconnected from power supply and switch is
in
OFF position.
2. Be
sure the guard assembly
is
securely attached
to
the spindle
housing.
BACKING HUB
i;rry
SCREWS
FLARING
CUP
WHEEL
CLAMP
FIG.7
3.
Put
the backing hub onto the tool spindle.
4.
Check
rated
speed on depressed center wheel. Never
use
wheel with
rated speed lower than the speed
in
the'WARNING'
statement on the
nameplate
of
the tool
5. Place the depressed center wheel
on
the tool spindle.
6.
Thread the clamp washer
on
tool spindle, hold the tool spindle by
engaging
the lock
button,
and tighten clamp
washer
with
ppanner
wrench.
See page
T
lor
a
complete
description
ol
usage
and
mounting alternatives.
When
using
a
depressed center
wheel,
hold the
tool
so
that an
angle of
approximately
30o
exists between the wheel and the work.
Wire Brushing
1.
Disconnect tool from power source. Rest grinder on
its
back with
spindle facing
up.
2.
Thread wire cup brush onto spindle and tighten.
3.
Common applications
for
wire cup brushes include cleaning welds,
angles, corners and removal of
paint.
4.
Always wear eye protection and appropriate protective clothing.
Flaring Cup Wheels (FIG.
fl
Use
flaring cup wheels for smoothing welds, casting ridges, or large metal
areas, cutting off studs, bolts, rivets, etc. A
5/8' -
11
thread bushing
in
the
wheel threads directly on the
tool
spindle. Flaring Cup Wheels
should
only be used in
conjunction
with the correct size
adjustable
skirt
guard.
Disconnect
the tool from
the
power supply. Attach guard with the
open
paft
of
the guard facing away from the operator. Tighten mounting screws
to
sêcure
guard
in
place.
Hold down
the spindle lock button
and
thread the flaring cup wheel onto the spindle.
Be
sure that the wheel
is
firmly and
completely
threaded onto the spindle.
Loosen screws
holding
the
adjustable
skirt
part
of
the guard
and
slide
the
skirt down
until about
1/4"
of the llaring cup wheel is
exposed.
Tighten
screws.
When
using
tool,
tilt
tool slightly-do not hold wheel
perfectly
flat
against
the
work. Avoid bouncing
the
wheel
or
giving
it
rough
treatment,
since cracks
might develop
which would
cause
the
wheel
to fly
apart. Always check the wheel
for
cracks before using it,
and
always
use a
wheel guard.
Maintenance
ol
Tool
Cleaning
Blowing dust and grit out
oI
the motor housing using compressed air
is
a
necessary regular maintenance procedure. Dust and grit containing
metal particles often accumulate on interior surfaces and could create
an electrical shock hazard
if not
frequently cleaned out.
CAUTION:
Never
use solvenls or other
harsh chemicals
for
cleaning
the non-metallic parts
of
the tool.
Use
clean, dry
rag
only.
Lubrication
DeWALT tools are properly lubricated at the factory
and
are ready for
use. Tools should
be
relubricated regularly every
sixÿ
days
to
six
months, depending on usage. (Tools used constantly on production
or
heavy-duÿ
iobs and tools exposed
to
heat may require more frequent
lubrication.)
This lubrication should only be
attempted
by
trained
power tool repairpersons.

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