Practical Grinder Application; Maintenance And Inspection - Hitachi G 13YD Handling Instructions Manual

English
Dial Use
1 Polishing, fi nishing
2 Removal of paint or coat Sanding disc
3 Removal of rust
4 Removal of burrs
5 Grinding
6 Rough grinding
Cutting
NOTE: Use caution not to turn the dial scale to any value
below 1 or above 6.

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: (G13V only)
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).
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.
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. 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.
8
Tools
Radial grinding disc
Depressed center wheel
Depressed center
wheel
Diamond wheel
○ Ensure that sparks resulting from use do not create
a hazard e.g. do not hit persons, or ignite fl ammable
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
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>
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.
CAUTION
○ Comfi rm that the depressed center wheel is mounted
fi rmly.
○ Confi rm that the push button is disengaged by pushing
push button two or three times before switching the
power tool on.

MAINTENANCE AND INSPECTION

1. Inspecting the depressed center wheel
Ensure that the depressed center wheel is free of
cracks and surface defects.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure that
they are properly tightened. Should any of the screws
be loose, retighten them immediately. Failure to do so
could result in serious hazard.