Hitachi G 13SE3 Handling Instructions Manual page 24

English
2. Pressure
To prolong the life of the machine and ensure a fi rst class fi nish, 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 suffi cient for eff ective grinding. Too much pressure will
result in reduced rotational speed, inferior surface fi nish, and overloading which could
reduce the life of the machine.
3. Grinding angle
Do not apply the entire surface of the depressed center
wheel to the material to be ground. As shown in Fig. 6,
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.
4. 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. 6 direction B). Once the leading edge of the depressed center wheel is
properly abraded, grinding may be conducted in either direction.
5. 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.
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Ensure that ventilation openings are kept clear when working in dusty conditions.
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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
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persons, or ignite fl ammable substances.
Always use eye and ear protection.
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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.
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A
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15°–30°
B
Fig. 6