3.
Power
switch
Ensure
that
the
power
switch
is
in
the
OFF
position.
If
the
plug
is
connected
to
a
receptacle
while
the
power
switch
is
in
the
ON
position,
the
power
tool
will
start
operating
immediately,
which
could
cause
a
serious
accident.
4.
Extension
cord
When
the
work
area
is
removed
from
the
power
source,
use
an
extension
cord
of
su
ffi
cient
thickness
and
rated
capacity.
The
extension
cord
should
be
kept
as
short
as
practicable.
5.
Con
fi
rming
condition
of
the
environment
Con
fi
rm
that
the
work
site
is
placed
under
appropriate
conditions
conforming
to
prescribed
precautions.
When
grinding
a
thin
steel
plate,
depending
upon
the
state
of
the
workbench,
a
loud
noise
will
be
created
due
to
resounding
noise
from
the
steel
plate
being
ground.
To
eliminate
unwanted
noise
in
this
instance,
place
a
rubber
mat
beneath
the
material
to
be
ground.
6.
Mounting
the
wheel
guard
Be
sure
to
mount
the
wheel
guard
at
an
angle
that
will
protect
the
operator’s
body
from
injury
by
a
broken
wheel
piece.
7.
Con
fi
rm
the
lock
pin
Con
fi
rm
that
the
lock
pin
is
disengaged
by
pushing
lock
pin
two
or
three
times
before
switching
the
power
tool
on.
8.
Con
fi
rming
and
mounting
the
depressed
center
wheel.
Thoroughly
check
that
a
speci
fi
ed
depressed
center
wheel
is
free
of
cracks
and
splits
is
mounted.
Con
fi
rm
that
the
depressed
center
wheel
is
mounted
under
the
speci
fi
ed
condition
and
is
fi
rmly
clamped.
For
details,
refer
to
the
item
“Assembling
and
Disassembling
the
depressed
center
wheel.”
9.
Apply
a
trial
run
To
start
grinding
work
without
checking
for
possible
cracks
and
splits
in
the
depressed
center
wheel
is
very
dangerous.
Prior
to
start
of
grinding,
direct
the
grinder
in
a
direction
where
no
one
is
present,
and
apply
a
trial
run
without
fail
to
con
fi
rm
that
the
grinder
displays
no
abnormalities.
Duration
of
the
trial
run
is
as
follows:
When
depressed
center
wheels
is
replaced
........................................................ 3
minutes
or
more
When
starting
daily
work
...................1
minute
or
more
PRACTICAL
GRINDER
APPLICATION
1.
Since
grinding
by
utilizing
only
the
grinder’s
own
weight
is
feasible,
the
grinder
should
never
be
pressed
forcibly
against
the
plane
to
be
ground.
Hold
the
grinder
lightly
so
that
it
only
slightly
contacts
the
plane
to
be
ground.
Heavy
pressure
will
reduce
the
revolving
speed
and
such
deteriorate
the
fi
nished
surface,
and
phenomena
as
overload
will
lead
to
burning
out
of
the
motor.
2.
Do
not
utilize
the
grinder
entire
surface
when
grinding.
Use
only
its
peripheral
surface
by
tilting
the
wheel
at
an
angle
of
15°–30°,
as
shown
in
Fig.
1
.
3.
When
a
grinder
equipped
with
a
new
depressed
center
wheel
is
pushed
forward
(direction
A),
the
wheel
edge
may
occasionally
cut
into
the
material
to
be
ground.
Always
pull
it
backward
(direction
B)
in
this
instance.
However,
once
the
depressed
center
wheel
angle
has
been
adequately
abraded,
both
forward
and
backward
operations
are
permissible.
4.
The
provided
depressed
center
wheel
(resinoid
wheel)
is
rated
as
Class
A
grain
and
#36
grain
size.
Accordingly,
its
range
of
applications
cover
a
wide
variety,
proving
to
be
most
suitable
for
heavy
grinding
of
general
steel
materials.
Since
the
wheel
grain
size
is
rather
coarse,
creating
a
fi
ne-surfaced
fi
nish
is
very
di
ffi
cult.
In
this
instance,
hold
the
grinder
lightly
as
through
trying
to
lift
it,
and
apply
grinding
slowly
at
a
constant
low
speed.
Whereby
a
fi
ne
fi
nish
similar
to
that
accomplished
with
a
fi
ne-grain
depressed
center
wheel
is
obtainable.
5.
Switching
on
the
grinder
The
switch
can
be
turned
ON
by
turning
its
lever
ON
side,
or
turn
OFF
by
turning
its
lever
to
the
OFF
side.
6.
Precaution
after
use
Do
not
lay
the
grinder
down
immediately
after
use
in
a
place
where
there
are
many
shavings
and
much
dirt
and
dust
until
it
has
completely
stopped
revolving.
CAUTION
○
Shock
to
the
main
body
can
be
the
cause
of
cracks
or
splits
in
the
depressed
center
wheel.
Be
especially
careful
to
avoid
sudden
shocks
when
using
the
equipment.
If
the
main
unit
is
accidentally
bumped
or
dropped,
make
a
careful
check
for
cracks
or
splits
on
the
depressed
center
wheel
before
further
use.
○
Do
not
press
the
lock
pin
when
the
equipment
is
turning.
Also,
do
not
turn
on
the
switch
when
the
lock
pin
is
pressed
down.
ASSEMBLING
AND
DISASSEMBLING
THE
DEPRESSED
CENTER
WHEEL
(Fig.
2)
CAUTION
Be
sure
to
switch
power
OFF
and
disconnect
the
attachment
plug
from
the
power
receptacle
to
avoid
serious
trouble.
(1)
Turn
the
equipment
upside
down
so
that
the
spindle
will
be
facing
up.
(2)
Mount
the
wheel
washer
onto
the
spindle.
(3)
Mount
the
protuberance
of
the
depressed
center
wheel
onto
the
wheel
washer.
(4)
Mount
the
convex
side
of
the
wheel
nut
onto
the
depressed
center
wheel,
and
screw
the
wheel
nut
onto
the
spindle.
(5)
As
shown
in
Fig.
2
,
push
in
the
lock
pin
to
prevent
rotation
of
the
spindle.
Then,
secure
the
depressed
center
wheel
by
tightening
the
wheel
nut
with
the
wrench.
CAUTION
Con
fi
rm
that
the
depressed
center
wheel
is
mounted
fi
rmly.
Con
fi
rm
that
the
lock
pin
is
disengaged
by
pushing
lock
pin
two
or
three
times
before
switching
the
power
tool
on.
○
Disassembling
of
the
depressed
center
wheel
is
the
reverse
of
assembling.
HOW
TO
INSTALL
THE
OPTIONAL
ACCESSORIES
CAUTION
○
Be
sure
to
switch
power
OFF
and
disconnect
the
plug
from
the
power
receptacle
to
avoid
serious
trouble.
When
utilizing
the
optional
accessories,
keep
the
wheel
guard
attached
and
wear
protective
glasses.
1.
Mounting
the
100
mm
Sanding
Disc.
(see
Fig.
3)
NOTE
Do
not
use
the
wheel
washer
and
wheel
nut
of
the
depressed
center
wheel.
(1)
Mount
the
washer,
rubber
pad
and
sanding
disc
onto
the
spindle.
(2)
Screw
from
the
washer
nut
onto
the
spindle.
5
English
000Book̲PDA-100D̲Tha.indb 5
000Book̲PDA-100D̲Tha.indb 5
2009/04/10 9:23:33
2009/04/10 9:23:33
