Standard Accessories; Prior To Operation - Hitachi G 12SE2 Bedienungsanleitung

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STANDARD ACCESSORIES

(1) Depressed center wheel ...............................................1
(2) Wrench .........................................................................1
(3) Side handle ...................................................................1
Standard accessories are subject to change without notice.
APPLICATIONS
○ Removal of casting fi n and fi nishing of various types of
steel, bronze and aluminum materials and castings.
○ Grinding of welded sections or sections cut by means of
a cutting torch.
○ Grinding of synthetic resins, slate, brick, marble, etc.
○ Cutting of synthetic concrete, stone, brick, marble, and
similar materials.

PRIOR TO OPERATION

1. Power source
Ensure that the power source to be utilized conforms
to the power requirements specifi ed on the product
nameplate.
2. Power switch
Ensure that the power switch is in the OFF position. If
the plug is connected to a receptacle while the power
switch is in the ON position, the power tool will start
operating immediately, which could cause a serious
accident.
3. Extension cord
When the work area is removed from the power source,
use an extension cord of suffi cient thickness and rated
capacity. The extension cord should be kept as short as
practicable.
4. Fitting and adjusting the wheel guard
The wheel guard is a protective device to prevent injury
should the depressed center wheel be shattered during
operation. Ensure that the wheel guard is properly fi tted
and fastened before commencing grinding operation.
[How to attach and adjust the wheel guard](Fig. 2)
○ Set the wheel ass'y to the packing gland.
○ Tighten M5 screw to secure the wheel guard while the
lever is in closed position.
○ Perform the adjustment of the wheel guard while the
lever is released. (Loosen M5 screw and readjust if the
wheel guard does not rotate smoothly.)
○ After adjustment, if grinder operation is required,
perform the operation only after setting the lever in
closed position.
○ Lubricate the sliding section of the set piece (B) and the
lever if the lever does not move smoothly.
5. Ensure that mounted wheels and points are fi tted in
accordance with the manufacturer's instructions.
Ensure that the depressed center wheel to be utilized
is the correct type and free of cracks or surface defects.
Also ensure that the depressed center wheel is properly
mounted and the wheel nut is securely tightened, Refer
to the section on "Depressed Center Wheel Assembly"
Ensure that blotters are used when they are provided
with the bonded abrasive product and when they are
required.
Do not use separate reducing bushings or adaptors to
adapt large hole abrasive wheels.
For tools intended to be fi tted with threaded hole wheel,
ensure that the thread in the wheel is long enough to
accept the spindle length.
Do not use cutting off wheel for side grinding.
8
6. Conducting a trial run
Ensure that the abrasive products is correctly mounted
and tightened before use and run the tool at no-load for
30 seconds in a safe position, stop immediately if there
is considerable vibration or if other defects are detected.
If this condition occurs, check the machine to determine
the cause.
7. Confi rm the push button
Confi rm that the push button is disengaged by pushing
push button two or three times before switching the
power tool on (See Fig. 1).
8. Fixing the side handle
Screw the side handle into the gear cover.
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. 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
[When the switch has locking mechanism]
Switch ON: To switch on, slide the lock lever in the
direction of Ⓐ and press the paddle lever
in the direction of Ⓑ as shown in Fig. 4-a.
Furthermore, slide the lock lever in the
direction of Ⓒ shown in Fig. 4-b while
pressing the paddle lever to lock and
enable continuous operation.
Switch OFF: To release the locking mode, press the
paddle lever in the direction of Ⓑ shown
in Fig. 4-a, and release the paddle lever to
switch off .
[When the switch has no locking mechanism]
To switch on, slide the lock lever in the direction of
Ⓐ and press the paddle lever in the direction of Ⓑ as
shown in Fig. 4-a. Release the paddle lever to switch off .
NOTE
The paddle lever can not be locked.
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.
○ 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.