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H7758/H7759 8" & 10" Bench Grinders
-15-
Wheel Inspection
Before mounting a new grinding wheel, it must
be inspected. 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 moisture.
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 3, gently tap
the wheel with a light non-metallic device
such as the handle of a screwdriver or a
wooden mallet.
Figure 3. 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
16). 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. Take
off the outer guard and the rim guard.
3. Use a wrench on the nut that holds the wheel
on the arbor. Hold the wheel from turning
with your other hand. Note that the wheel on
the left-hand side of the machine has left-
handed threads, so the arbor nut on that side
must be turned clockwise to loosen.
4. Remove the outer wheel flange and the
paper disc. Pull the wheel free from the
arbor. There will also be a paper disc and a
wheel flange on the other side of the wheel.