Grinder Operation - Hitachi G12VA Manual De Instrucciones

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.
Lever
Set piece (B)
M5 screw
WARNING:
If the wheel guard is not attached properly, a
broken wheel may result in and cause death or
serious injury.
7. Thoroughly check that the depressed center wheel
is free of cracks, splits and other abnormalities
before mounting. Make sure it is firmly clamped
and has been properly mounted. Refer to page 12
of this manual for Depressed Center Wheel
Assembly and Disassembly
8. Test the grinder before using.
Before actually beginning the grinding work, test
the grinder by first clearing the area of all other
personnel. Make sure the wheel guard is in place
and that you are wearing eye protection. Turn the
grinder "on", and make sure the grinder runs
smoothly and shows no abnormalities.
Duration of the trial run is as follows:
When depressed center wheel is replaced
.......................................... 3 minutes or more
When starting daily work
............................................ 1 minute or more
9. Use only properly rated depressed center wheels.
Use only depressed center wheels rated at
13,300/min for G12VA, 12,000/min for G13VA and
10,200/min for G15VA or more.
Using a depressed center wheel rated less can lead
to wheel disintegration during operation and cause
serious bodily injury.
Fig. 2
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. Adjusting the number of revolution
Above models are equipped with an electronic
infinite-variable-speed drive and can change the
number of revolution according to a use.
If you turn and set the dial scale (Fig. 4) to 6, the
number of revolution increases, and if you turn
and set it to 1, the number of revolution decreases.
Before use, set the number of revolution using the
dial. In so doing, refer to the following table as a
rough guide.
Dial Use
1 Polishing, finishing
Removal of paint or
2
coat
3 Removal of rust
4 Removal of burrs
Grinding
5
Rough grinding
6 Cutting
English
Switch
OFF
ON
Fig. 3
Tools
Radial grinding
disc
Sanding disc
Depressed center
wheel
Depressed center
wheel
Diamond wheel
11