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For Machines Mfg. Since 8/09 Model SB1029
-23-
OPERATION
Wheel Inspection
Do not assume that a wheel is in sound condition
just because it is new—damage can often occur
during shipping, with age, with prolonged
exposure to moisture, or because of improper
storage.
To inspect a wheel for damage:
1. Remove the wheel and look for any cracks,
chips, nicks or dents in the surface of the
wheel. If you see any of these, DO NOT
attempt to use the wheel.
2. Do a ring test. This test will give you an
indication of any internal damage that may
not be obvious during a visual inspection.
3. Inspect the paper washers on both sides of
the grinding wheel (see Figure 19). These
washers are cushions between the spacer
washer and the grinding wheel seat. Without
the washers, cracks can be spawned from
the center of the wheel when the spanner
nut is tightened. Over time, these cracks can
radiate outward and the wheel may explode
during operation, possibly causing injury.
Note: If you need to replace or install new paper
washers, replacements can be cut out of
any thick construction paper or card stock.
Regular notebook paper or paper from a copy
machine is not acceptable, as it is too thin
to provide the required cushion. Be sure to
transfer any RPM limitations and wheel type
information.
Figure 19. Important paper washer.
Paper
Washer
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 is clean and dry;
otherwise, you may get false results.
2. Hang the wheel in the air with a piece of
cord or string looped through the hole in the
center, as shown in Figure 20.
3. At the locations shown in Figure 20, gently
tap the wheel with a light non-metallic
device such as the handle of a screwdriver or
a wooden mallet.
An undamaged wheel will emit a clear
metallic ring or “ping” sound in each of these
spots. A damaged wheel will respond with
a dull thud that has no clear tone. If you
determine from the ring test that the wheel
is damaged, DO NOT use it!
Figure 20. Ring test setup and test locations.
Paper Washer
Ring Test