Hitachi Koki G 12VA Instrucciones De Manejo página 8

English
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. Confi rm the push button.
Confi rm that the push button is disengaged by pushing
push button two or three times before switching the
power tool on (see Fig. 1).
8. Fixing the side handle.
Screw the side handle into the gear cover.
9. Adjusting the number of revolution
Above models are equipped with an electronic infi nite-
variable-speed drive and can change the number of
revolution according to a use.
If you turn and set the dial scale (Fig. 4) to 6, the number
of revolution increases, and if you turn and set it to 1, the
number of revolution decreases.
Before use, set the number of revolution using the dial. In
so doing, refer to the following table as a rough guide.
Dial Use
1 Polishing, fi nishing
Removal of paint or
2
coat
3 Removal of rust
4 Removal of burrs
Grinding
5
Rough grinding
6 Cutting
NOTE
Use caution not to turn the dial scale to any value below 1
or above 6.
10. Caution when using near welding equipment
When using the grinder in the immediate vicinity of welding
equipment, the rotational speed may become unstable.
Do not use the grinder near welding equipment.
PRACTICAL GRINDER APPLICATION
1. Pressure
Do not apply the grinding wheel strongly to the grinding
surface. The grinder makes use of electronic circuit,
so during application of load rotates at high speed, so
ample grinding eff ect can be obtained by applying light
pressure. If a strong grinding pressure or other abnormal
load is applied, the overload protection circuit will operate
and make the grinder stop rotating, so please stop
applying load immediately. Following this, switching the
power OFF and then ON again, will cause the rotation to
increase to the regular speed.
CAUTION
When using the tool at any value except the full speed
(Dial scale 6), the motor cannot be suffi ciently cooled due
to the decreased number of revolution. This could result
in the risk of burning and damaging the motor before an
overload protective mechanism starts to function.
Make sure that you use the tool by lightly applying it to the
surface of material when you use it at any value except
the full speed (Dial scale 6).
7
Tools
Radial grinding disc
Sanding disc
Depressed center
wheel
Depressed center
wheel
Diamond wheel
2. Grinding angle
Do not apply the entire surface of the depressed center
wheel to the material to be ground. As shown in Fig. 3,
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.
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. 3 direction B). Once the leading edge of
the depressed center wheel is properly abraded, grinding
may be conducted in either direction.
4. Precautions immediately after fi nishing operation
The wheel continues to rotate after the tool is switched
off .
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, fi rst
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 fl ammable
substances.
○ 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
ACCESSORIES (Fig. 1)
CAUTION
Be sure to switch OFF and disconnect the attachment
plug from the receptacle to avoid a serious accident.
<DEPRESSED CENTER WHEEL>
1. Assembling (Fig. 1)
(1) Turn the equipment upside-down so that the spindle will
be facing up.
(2) Mount the wheel washer onto the spindle.
(3) Fit the protuberance of the depressed center wheel onto
the wheel washer.
(4) Screw from above the wheel nut onto the spindle.
(5) As shown in Fig. 1, push in the push button to prevent
rotation of the spindle. Then, secure the depressed center
wheel by tightening the wheel nut with the wrench.
2. Disassembling
Follow the above procedures in reverse.
<RADIAL GRINDING DISC/DIAMOND WHEEL>
Same as depressed center wheel.
<SANDING DISC>
1. Assembling (Fig. 1)
(1) Turn the equipment upside-down so that the spindle will
be facing up.
(2) After placing the sanding disc on the rubber pad, thread
the washer nut onto the spindle.
(3) Press the push button to secure the spindle and tighten
the washer nut with a wrench.
2. Disassembling
Follow the above procedures in reverse.