Wheel Selection
your model g2790 uses only type 5 grinding
wheels that have a
⁄
" bore and are 6" in diameter
1
2
and 1
⁄
" thick, similar to the one included with
1
2
your grinder. refer to Accessories on page 21
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.
-16-
grit
Bond
grade
size
type
100
K
V
Wheel care
your safety when grinding depends, in a large
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 24 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 23 for detailed instructions).
•
always visually inspect and perform the ring
test before installing any grinding wheel (refer
to Wheel Inspection & Ring test on page
16 for detailed instructions).
g2790 universal Knife grinder