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H8148/H8149/H8150 Heavy Duty Bench Grinder
-19-
Wheel Inspection
Do not assume that a wheel is in sound condition
just because it is new—often damage can occur
in shipping, with age, or with exposure to mois
-
ture. Inspect every wheel for damage.
First, do a Visual Inspection. Look for any
cracks, chips, nicks or dents in the surface of the
wheel. If you see any of these, DO NOT use the
wheel.
Second, do a Ring Test. This test will give you an
indication of any internal damage that may not be
obvious during a visual inspection.
To perform a Ring Test:
1. Make sure the wheel that you test is clean and
dry; otherwise, you may get false results.
2. If size permits, balance the wheel with your
finger in the hole. If this is not possible, hang
the wheel in the air with a piece of cord or
string looped through the hole in the center.
3. At the spots shown in Figure 12, gently tap
the wheel with a light non-metallic device
such as the handle of a screwdriver or a
wooden mallet.
Figure 12. Tapping locations when performing a
ring test.
4. An undamaged wheel will emit a clear metal-
lic ring or “ping” sound in each of these spots.
A damaged wheel will respond with a dull
thud that has no clear tone.
5. If you determine from the ring test that the
wheel is damaged, DO NOT use it!
Wheel Dressing
Depending on the type of grinding you do, the
grinding wheel may require periodic dressing.
There are several different types of wheel dress
-
ing devices available on the market (see Page
21). Dressing restores the abrasive quality of the
wheel surface and brings the wheel edge back to
a square form.
Refer to the instructions that accompany your
dressing accessory for complete details on how
to properly dress a wheel.
Wheel Replacement
The wheel guard assembly must be removed in
order to mount or dismount a grinding wheel.
To replace a grinding wheel
:
1. UNPLUG THE GRINDER!
2. Remove the three Phillips head screws and
nuts that go through the outer guard, and
remove the outer guard.
3. Hold the wheel from turning, and remove the
arbor nut which holds the wheel on.
Note: The arbor shaft and nut on the left
hand side of the grinder is a left hand thread,
so loosening it will require turning it clock
-
wise.