HIKOKI G 12SA3 Manuale di istruzioni per la movimentazione - Pagina 6

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English

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.

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.

15° – 30°

Fig. 2

ASSEMBLING AND DISASSEMBLING THE

DEPRESSED CENTER WHEEL (Fig. 3)

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 disc grinder upsidedown so that the spindle is

facing upward.

(2) Align the across ﬂ ats of the wheel washer with the

notched part of the spindle, then attach them.

(3) Fit the protuberance of the depressed center wheel onto

the wheel washer.

(4) Screw the wheel nut onto the spindle.

(5) While pushing the push button with one hand, lock the

spindle by turning the depressed center wheel slowly

with the other hand.

Tighten the wheel nut by using the supplied wrench as

shown in Fig. 3.

Wrench

Wheel nut

Depressed

center wheel

Wheel washer

Spindle

Wheel guard

2. Disassembling

Follow the above procedures in reverse.

CAUTION

Conﬁ 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.

3. Inspecting the carbon brushes (Fig. 4)

The motor employs carbon brushes which are

consumable parts. Since an excessively worn carbon

brush can result in motor trouble, replace the carbon

brush with a new one having the same carbon brush No.

shown in the ﬁ gure when it becomes worn to or near the

"wear limit". In addition, always keep carbon brushes

clean and ensure that they slide freely within the brush

holders.

Diamond wheel

Push button

Fig. 3