Practical Grinder Application - Hitachi G 14DMR Handling Instructions Manual

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PRACTICAL GRINDER APPLICATION

1. 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.
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.
NOTE
To prevent injuries, this product has a function that prevents unexpected motor rotation
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when the battery is inserted. The motor will not run if the battery is inserter while the switch
is still ON. After installing the battery, turn the switch off and then back on again.
The G14DL and G18DL models are equipped with a protection function that will shut down
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the tool in the event of an overload.
Should the tool shut down due to an overload, turn the power off and then turn it back on
again.
An overload that stops tool operation and lasts more than 10 seconds may not be released
by turning the power off and on. Should this happen, remove the battery from the tool and
reinstall it before turning on the power switch.
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.
○
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.
42
15° — 30°
A B
Fig. 2