Practical Grinder Application; How To Install The Optional Accessories - Hitachi PDA-100D Handling Instructions Manual

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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 suffi cient thickness and rated
capacity. The extension cord should be kept as short as
practicable.
5. Confi rming condition of the environment
Confi 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. Confi rm the lock pin
Confi rm that the lock pin is disengaged by pushing lock
pin two or three times before switching the power tool
on.
8. Confi rming and mounting the depressed center
wheel.
Thoroughly check that a specifi ed depressed center
wheel is free of cracks and splits is mounted.
Confi rm that the depressed center wheel is mounted
under the specifi 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 confi 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.
5
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
diffi 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
Confi rm that the depressed center wheel is mounted
fi rmly.
Confi 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.