Grizzly G0597 Manuale Utente

G0596-G0599 Industrial 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 6, gently tap

the wheel with a light non-metallic device
such as the handle of a screwdriver or a
wooden mallet.

Note: Finding the exact spot to tap will take
several attempts.

Figure 6. Tapping locations when performing a

ring test.

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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

17). 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.