Hitachi PDA-100H, Handling Instructions Manual

Page: 6 / 13

English
5
7. Confirm the lock pin
Confirm that the lock pin is disengaged by pushing
lock pin two or three times before switching the
power tool on.
8. Confirming and mounting the depressed center
wheel.
Throughly check that a specified depressed center
wheel is free of cracks and splits is mounted.
Confirm that the depressed center wheel is mounted
under the specified condition and is firmly 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 confirm 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 APPLICATIONS
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 finished surface, and phenomena
as overload will lead to burning out of the motor.
2. Do not utilize the depressed center wheel’s 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 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 fine-surfaced finish is very
difficult.
In this instance, hold the grinder lightly as through
trying to lift it, and apply grinding slowly at a constant
low speed. Whereby a fine finish similar to that
accomplished with a fine-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.
CAUTIONS:
䡬
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.
䡬
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 upsidedown 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: Confirm that the depressed center wheel is
mounted firmly.
Confirm that the lock pin is disengaged by
pushing lock pin two or three times before
switching the power tool on.
䡬
Disassembling of the depressed center wheel is the
reverse of assembling.
HOW TO INSTALL THE OPTIONAL
ACCESSORIES
CAUTIONS:
䡬
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 100mm 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.
(3) As shown in
Fig. 3 , push in the lock pin to prevent
rotation of the spindle. Then, secure the sanding disc
by tightening the wheel nut with the wrench.
2. Mounting the Diamond Wheel
CAUTION:
When utilizing the diamond wheel, pay particular
attention to the following points.
(1) Utilize the correct size diamond wheel (external dia.
105mm, hole dia. 20mm)
(2) Do not apply cooling water or grinding fluid while
utilizing the diamond wheel.