For Machines Mfg. Since 8/09 | O P E R A T I O N | Model SB1029 |
Wheel Inspection
Do not assume that a wheel is in sound condition just because it is
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.
Paper
Washer
Figure 19. Important paper washer.
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.
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 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.
Paper Washer
Figure 20. Ring test setup and test locations.
3.At the locations shown in Figure 20, gently tap the wheel with a light
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!