Grinder Operation; Depressed Center Wheel Assembly And Disassembly - Hitachi G12SN Manual De Instrucciones

9. Use only properly rated depressed center wheels.
Use only depressed center wheels rated at
13,300/min for G12SN 12,000/min for G13SN or
more.
Using a depressed center wheel rated less can lead
to wheel disintegration during operation and cause
serious bodily injury.
10. Check the push button.
Make sure that the push button is disengaged by
pushing push button two or three times before
turning on the grinder. (Fig. 5)

GRINDER OPERATION

1. Hold the grinder firmly by its housing and side
handle (Fig. 1).
The grinder produces a counterforce which must
be controlled by firmly holding onto the grinder.
2. Turn the grinder "on". (Fig. 3)
While holding the grinder firmly, use one finger to
slide the switch to the "on" position.
3. Use light grinding pressure.
There is no need to press hard when grinding.
Usually the grinder's own weight is sufficient to
allow the required light contact with the surface to
be ground.
WARNING
Do not press the grinder forcibly against the
surface to be ground. Heavy pressure can result
in wheel breakage and serious injury. It can also
damage the surface being ground or damage the
grinder's motor.
4. Use proper grinding angle.
Grind only with the wheel's edge by lifting the
grinder 15° to 30°, as shown in Fig. 4.
CAUTION
Do not use the entire surface of the depressed
center wheel. Use only the edge of the depressed
center wheel.
Switch
OFF
ON
Fig. 3
5. Move the grinder in the proper direction.
When using a new depressed center wheel in
direction A (Fig. 4), the wheel edge may cut into the
workpiece. In this case, grind in direction B (Fig. 4).
Once the wheel edge is worn, the workpiece can be
ground in both directions.
A
NOTE
The wheel provided (resinoid wheel) is rated as
Class A grain and # 36 grain size for G12SN, # 24
grain size for G13SN. They are most suitable for
heavy grinding of steel and other types of
materials.
6. Adjust operation to desired finish.
For a fine finish, decrease pressure by lifting
slightly. Grind slowly and at the appropriate speed.
WARNING
The revolving depressed center wheel will create
air turbulence.
Do no lay the grinder down in areas of dust or dirt
until it has come to a complete stop.
DEPRESSED CENTER WHEEL ASSEMBLY
AND DISASSEMBLY
WARNING
Never attempt to assemble or disassemble the
depressed center wheel, unless the power switch
is in the "OFF" position and the electrical cord has
been disconnected from the receptacle.
1. Assembly
(1) Turn the disc grinder upsidedown so that the
spindle is facing upward.
(2) Align the oval-shaped indentation 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. 5.
English
15° – 30°
B
Fig. 4
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