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Шлифовальная Машина
G18SR
Инструкция по эксплуатации Страница: 10

Hitachi G18SR [10/68] English

English

PRACTICAL GRINDER APPLICATION

1. Pressure

To prolong the life of the machine and ensure a

first class finish, 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 sufficient for effective grinding.

Too much pressure will result in reduced rotational

speed, inferior surface finish, 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. 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. Switch operation

Switch ON: Push the locking button forward and

then press the switch lever.

* For continuous use, press the switch

lever. The switch lever is locked by

pushing the locking button forward

once again.

(*Subject to change depending on

area.)

Switch OFF: Press and release the switch lever.

5. Precautions immediately after finishing operation

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.

CAUTIONS

䡬 Check that the work piece is properly supported.

䡬 Ensure that ventilation openings are kept clear when

working in dusty conditions.

If it should become necessary to clear dust, first

disconnect the tool from the mains supply (use non-

metallic objects) and avoid damaging internal parts.

䡬 Ensure that sparks resulting from use do not create

a hazard e.g. do not hit persons, or ignite flammable

substances.

䡬 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.

䡬 When the machine is not use, the power source

should be disconnected.

ASSEMBLING AND DISASSEMBLING THE

DEPRESSED CENTER WHEEL

CAUTION

Be sure to switch OFF and disconnect the attachment

plug from the receptacle to avoid a serious accident.

1. Assembling (Fig. 1)

(1) Turn the machine upside down so that the spindle

is facing upward.

(2) Mount the wheel washer onto the spindle.

(3) Fit the protruding part of the depressed center

wheel onto the wheel washer.

(4) Screw the wheel nut onto the spindle.

(5) Insert the push button to prevent rotation of the

spindle, and tighten the wheel nut with the accessory

wrench, as shown in Fig. 1.

2. Disassembling

Follow the above procedures in reverse.

CAUTIONS

䡬 Comfirm that the depressed center wheel is mounted

firmly.

䡬 Confirm 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.

When they become worn to or near the “wear

limit”, it could result in motor trouble. When an

auto-stop carbon brush is equipped, the motor will

stop automatically.

At that time, replace both carbon brushes with new

ones which have the same carbon brush numbers

shown in the figure. In addition, always keep carbon

brushes clean and ensure that they slide freely

within the brush holders.

4. Replacing carbon brushes

G18SH2

•

G18U2

•

G23SF2

•

G23U2 (Fig. 5)

〈Disassembly〉

(1) Loosen the D4 tapping screw retaining the brush

cover and remove the brush cover.

(2) Use the auxiliary hexagonal wrench or small

screwdriver to pull up the edge of the spring that

is holding down the carbon brush. Remove the

edge of the spring toward the outside of the brush

holder.

(3) Remove the end of the pig-tail on the carbon brush

from the terminal section of brush holder and then

remove the carbon brush from the brush holder.

〈Assembly〉

(1) Insert the end of the pig-tail of the carbon brush

in the terminal section of brush holder.

(2) Insert the carbon brush in the brush holder.

(3) Use the auxiliary hexagonal wrench or small

screwdriver to return the edge of the spring to the

head of the carbon brush.

(4) Mount the tail cover and tighten the D4 tapping

screw.

01Eng_G18SH2_EE 11/30/09, 18:499

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English PRACTICAL GRINDER APPLICATION 1 Pressure To prolong the life of the machine and ensure a first class finish 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 sufficient for effective grinding Too much pressure will result in reduced rotational speed inferior surface finish 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 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 Switch operation Switch ON Push the locking button forward and then press the switch lever For continuous use press the switch lever The switch lever is locked by pushing the locking button forward once again Subject to change depending on area Switch OFF Press and release the switch lever 5 Precautions immediately after finishing operation 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 CAUTIONS O Check that the work piece is properly supported O Ensure that ventilation openings are kept clear when working in dusty conditions If it should become necessary to clear dust first disconnect the tool from the mains supply use nonmetallic objects and avoid damaging internal parts O Ensure that sparks resulting from use do not create a hazard e g do not hit persons or ignite flammable substances O 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 O When the machine is not use the power source should be disconnected ASSEMBLING AND DISASSEMBLING THE DEPRESSED CENTER WHEEL CAUTION Be sure to switch OFF and disconnect the attachment plug from the receptacle to avoid a serious accident 9 1 Assembling Fig 1 1 Turn the machine upside down so that the spindle is facing upward 2 Mount the wheel washer onto the spindle 3 Fit the protruding part of the depressed center wheel onto the wheel washer 4 Screw the wheel nut onto the spindle 5 Insert the push button to prevent rotation of the spindle and tighten the wheel nut with the accessory wrench as shown in Fig 1 2 Disassembling Follow the above procedures in reverse CAUTIONS O Comfirm that the depressed center wheel is mounted firmly O Confirm 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 When they become worn to or near the wear limit it could result in motor trouble When an auto stop carbon brush is equipped the motor will stop automatically At that time replace both carbon brushes with new ones which have the same carbon brush numbers shown in the figure In addition always keep carbon brushes clean and ensure that they slide freely within the brush holders 4 Replacing carbon brushes G18SH2 G18U2 G23SF2 G23U2 Fig 5 Disassembly 1 Loosen the D4 tapping screw retaining the brush cover and remove the brush cover 2 Use the auxiliary hexagonal wrench or small screwdriver to pull up the edge of the spring that is holding down the carbon brush Remove the edge of the spring toward the outside of the brush holder 3 Remove the end of the pig tail on the carbon brush from the terminal section of brush holder and then remove the carbon brush from the brush holder Assembly 1 Insert the end of the pig tail of the carbon brush in the terminal section of brush holder 2 Insert the carbon brush in the brush holder 3 Use the auxiliary hexagonal wrench or small screwdriver to return the edge of the spring to the head of the carbon brush 4 Mount the tail cover and tighten the D4 tapping screw