Wheel Selection; Wheel Care - Grizzly G2790 Owner's Manual

Wheel Selection

Yo r Model G2790 uses only Type 5 grind
u
wheels that have a 1⁄2" bore and are 6" in diameter
and 1 1⁄2" thick, similar to the one included with
your grinder. Refer to Accessories on Page 24
for options from Grizzly.
Aluminum oxide and silicon carbide wheels are
typically marked in a uniform manner by all major
manufacturers. Understanding these markings
will help you understand the capabilities of vari-
ous wheels.
The typical format for wheel numbering is:
Abrasive
Type
Type
5 A
• Type: Refers to a particular wheel configura-
tion, such as Type 5, which has a recessed
center for the top-mounting flange.
• Abrasive Type: Refers to the abrasive grain
of the wheel. The most common types are A
for aluminum oxide, C for silicon carbide, and
SG for seeded gel.
• Grit Size: Refers to the size of the abrasive
grain in the wheel. The lower the number, the
coarser the wheel.
Grade: Indicates the hardness of the wheel
•
with A being the softest and Z being the hard-
est.
Bond Type: Refers to the type of bonding
•
material used to hold the abrasive grain.
Most general-purpose wheels will have a
V, indicating vitrified clay, which provides
high strength and good porosity. The other
common bond type is B for synthetic resins,
which are generally used to grind cemented
carbide and ceramic materials.
Note: There may be other numbers or letters
that have meaning for a particular type of wheel.
Always refer to the manufacturer's technical data
for a complete explanation when choosing a
grinding wheel.
-18-
Grit Bond
Grade
Size Type
100 K V

Wheel Care

n Your safety when grinding depends, in a large
i
g
part, on the condition of the wheel during opera-
tion. A wheel in poor condition increases the risk
of it flying apart while spinning and injuring the
operator or causing property damage.
Follow these rules to reduce the risk of break-
ing the wheel:
• Always transport, store, and handle wheels
with care. Wheels could be damaged if they
are dropped or if heavy objects are stacked
on them.
• Select the right grinding wheel for the job. DO
NOT grind materials that are not correct for
the wheel type.
• Select the right grinding wheel for the machine.
If a grinding wheel rotates faster than its RPM
rating, it could fly apart during operation.
Mount the wheels properly (refer to Wheel
•
Replacement on Page 28 for detailed instruc-
tions). Never use a wheel with the wrong bore
size for the machine.
• Do not abuse the wheel by jamming the
work into the grinding wheel with excessive
force or by allowing the workpiece to become
overly hot during operation.
• Do not store wheels in a damp or wet location
that will damage the bonding material.
• Replace the wheel when it becomes less
than ⁄ of its original thickness or less than
1
2
⁄ ".
3
4
• Use only the wheel flanges that are included
with for your grinder.
• To ensure good grinding results, dress the
wheel often (refer to Wheel Dressing on
Page 27 for detailed instructions).
• Always visually inspect and perform the ring
test before installing any grinding wheel (refer
to Wheel Inspection & Ring Test on Page
19 for detailed instructions).
Model G2790 (Mfd. Since 04/13)