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Inspecting
Grinding Wheel
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 ring test:
1.
Make sure grinding wheel tested is clean and
dry; otherwise, you may get false results.
2.
If size permits, balance grinding wheel with
your finger in mounting hole. If this is not pos-
sible, hang wheel in air with a piece of cord or
string looped through mounting hole.
3.
At spots shown in Figure 13, gently tap grind-
ing wheel with a light non-metallic device
such as handle of a screwdriver or a wooden
mallet.
Rated 3500 RPM
Make sure your grinder is not
faster than the rated RPM of this wheel
Type-1
Aluminum
Oxide
WARNING
Grinding can be dangerous
Visually inspect this wheel
for cracks, nicks,chips
Figure 13. Tapping locations when performing a
ring test.
Note: Finding exact spot to tap may take sev-
eral attempts.
Model T32720 (Mfd. Since 06/21)
STOP
60 Grit
Grade L
Vitrified Bond
— An undamaged grinding wheel will emit a
clear metallic ring or "ping" sound in each
of these spots. A damaged grinding wheel
will respond with a dull thud that has no
clear tone.
— If you determine from ring test that grind-
ing wheel is damaged, DO NOT use it!
Adjusting Torque
The torque adjustment knob adjusts the pres-
sure of the motor shaft against the drive wheel.
If you notice either of the wheels "slipping" or not
rotating at a constant rate during operations, the
torque needs to be adjusted.
To adjust torque:
1.
Turn machine ON and begin operation.
— If wheel rotates at constant rate while
applying workpiece pressure, torque is
adjusted correctly.
— If wheel does not rotate at constant rate
while applying workpiece pressure, torque
is not adjusted correctly. Turn torque
adjustment knob clockwise until wheel
does not slip while desired workpiece
pressure is applied (see Figure 14).
Torque Adjustment
Knob
Figure 14. Location of torque adjustment knob.
2.
Turn machine OFF.
Note: Turn torque adjustment knob counter-
clockwise to release motor pressure when
sharpener is not in use to preserve torque
components.
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