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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 abnomalities before
mounting. Make sure it is fi rmly clamped and has
been properly mounted. Refer to page 11 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 fi rst 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 6600
RPM 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 fi rmly by its handle and side handle
(Fig. 1)
The grinder produces a counterforce which must be
controlled by fi rmly holding onto the grinder.
2. Turn the grinder "on" (Fig. 3)
Locking Button
While holding the grinder fi rmly, use one fi nger to
switch to the "on" position.
Switch ON: Push the locking button forward and then
press the switch lever.
10
Switch Lever
Fig. 3
* 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.
3. Use light grinding pressure
There is no need to press hard when grinding. Usually
the grinder's own weight is suffi cient 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.
A
CAUTION
Do not use the entire surface of the depressed
center wheel. Use only the edge of the depressed
center wheel.
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.
NOTE
The wheel provided (resinoid wheel) is rated as Class
A grain and # 24 grain size. It is most suitable for
heavy grinding of steel and other types of materials.
6. Adjust operation to desired fi nish
For a fi ne fi nish, decrease pressure by lifting slightly.
Grind slowly and at the appropriate speed.
15° – 30°
B
Fig. 4
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