Hitachi G 18SE3 Handling Instructions Manual page 4

5. Ensure that the depressed center wheel to be utilized
is the correct type and free of cracks or surface defects.
Also ensure that the depressed center wheel is
properly mounted and the wheel nut is securely
tightened, refer to the section on "Depressed Center
Wheel Assembly".
6. Conducting a trial run
Ensure that the abrasive products is correctly mounted
and tightened before use and run the tool at no-load
for 30 seconds in a safe position, stop immediately if
there is considerable vibration or if other defects are
detected.
If this condition occurs, check the machine to
determine the cause.
7. Confirm the spindle lock mechanism
Confirm that the spindle lock is disengaged by pushing
push button two or three times before switching the
power tool on (See Fig. 3).
8. Fixing the side handle
Screw the side handle into the gear cover.
PRACTICAL GRINDER APPLICATION
1. Pressure
To prolong the life of the machine and ensure a first
class finish, it is important that the machine should
not be overloaded by applying too much pressure. In
most applications, the weight of the machine alone is
sufficient for effective grinding. Too much pressure
will result in reduced rotational speed, inferior surface
finish, and overloading which could reduce the life of
the machine.
2. Grinding angle
Do not apply the entire surface of the depressed
center wheel to the material to be ground. As shown
in Fig. 2, the machine should be held at an angle of
15° – 30° so that the external edge of the depressed
center wheel contacts the material at an optimum
angle.
A
3. To prevent a new depressed center wheel from
digging into the workpiece, initial grinding should be
performed by drawing the grinder across the
workpiece toward the operator (Fig. 2 direction B).
Once the leading edge of the depressed center wheel
is properly abraded, grinding may be conducted in
either direction.
4. Switch operation
Switch ON: Push the locking button forward and
then press the switch lever.
* For continuous use, press the switch
lever. The switch lever is locked by
3
15 – 30°
B
Fig. 2
pushing the locking button forward
once again.
(*Subject to change depending on
area.)
Switch OFF: Press and release the switch lever.
5. Precautions immediately after finishing operation
After switching off the machine, do not put it down
until the depressed center wheel has come to a
complete stop. Apart from avoiding serious accidents,
this precaution will reduce the amount of dust and
swarf sucked into the machine.
CAUTION:
Check that the work piece is properly supported.
Ensure that ventilation openings are kept clear when
working in dusty conditions.
If it should become necessary to clear dust, first
disconnect the tool from the mains supply (use non-
metallic objects) and avoid damaging internal parts.
Ensure that sparks resulting from use do not create a
hazard e.g. do not hit persons, or ignite flammable
substances.
Always use protective safety glasses and hearing
protectors, use other personal protective equipment
such as gloves, apron and helmet when necessary.
Always use eye and ear protection.
Other personal protective equipment such as dust
mask, gloves, helmet and apron should be worn
when necessary.
If in doubt, wear the protective equipment.
When the machine is not use, the power source
should be disconnected.
ASSEMBLING AND DISASSEMBLING THE
DEPRESSED CENTER WHEEL AND OTHER
TOOLS
CAUTION:
Be sure to switch OFF and disconnect the attachment
plug from the receptacle to avoid a serious accident.
1. Assembling (Fig. 3)
(1) Turn the machine upside down so that the spindle is
facing upward.
(2) Mount the wheel washer onto the spindle.
(3) Fit the protruding part of the depressed center wheel
or cutting wheel or diamond wheel onto the wheel
washer.
(4) Screw the wheel nut onto the spindle.
(For diamond wheel assembling, use the wheel nut
with the convex side against the diamond wheel.)
(5) Insert the push button to prevent rotation of the
spindle, and tighten the wheel nut with the accessory
wrench, as shown in Fig. 3.
2. Disassembling
Follow the above procedures in reverse.
CAUTION:
Comfirm that the depressed center wheel is mounted
firmly.
Confirm that the push button is disengaged by
pushing push button two or three times before
switching the power tool on.