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Selecting
Grinding Wheel
The Model T32720 sharpener only accepts Type
5 grinding wheels with a
Aluminum-oxide and silicon-carbide wheels are
marked in a somewhat uniform manner by all
the major manufacturers. Understanding these
markings will help you understand the capabilities
of various wheels. Always refer to the manufac-
turer's grinding recommendations when selecting
a wheel for your project.
The basic format for wheel numbering is:
Abrasive
Prefix
Grit Size
Type
1
A
The Prefix is the manufacturer's designation for a
particular wheel type (eg. Type 1 wheels).
The most common Abrasive Types used are A
for Aluminum Oxide, C for Silicon Carbide, and
occasionally SG for Seeded Gel.
The Grit Size is a number that refers to the size
of the abrasive grain in the wheel. The lower the
number, the coarser the wheel. Ten is a very
coarse wheel for roughing and 220 is usually the
upper range for fine finish work.
Grade is an indication of the hardness of the
wheel—"A" being softest and "Z" being hardest.
Bond Type refers to the type of bonding material
used to hold the abrasive material. Most general
purpose wheels will have a "V" indicating Vitrified
Clay is used. Vitrified Clay provides high strength
and good porosity. The other common bond type
is "B" for resin where synthetic resins are used.
These are used to grind cemented carbide and
ceramic materials.
Note: There may be other numbers inserted that
have meaning for a particular type of wheel. Refer
to the manufacturer's technical data for a com-
plete explanation.
-18-
⁄
" bore.
1
2
Bond
Grade
Type
60
L
V
Caring for
Grinding Wheel
When grinding, your safety depends to a large
degree on the condition of the wheel. A wheel in
poor condition presents the possibility of breaking
apart during rotation and injuring the operator and
bystanders in the area.
Tips to help you avoid breaking the wheel:
•
Always transport, store and handle wheels
with care. Wheels may 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 material inappropriate for the
wheel type.
•
Only use wheels that are rated for the RPM
of the sharpener.
Mount the wheel properly (see Installing/
•
Removing Grinding Wheel on Page 22).
•
DO NOT push the workpiece into the grind-
ing wheel with such force that it causes the
sharpener to bog down. DO NOT apply pres-
sure to stop wheel after turning sharpener
OFF.
•
Dress the wheel when necessary (see
Maintaining Grinding Wheel on Page 28).
Do not allow it to become glazed. Dress
wheel so the surface is parallel with the uni-
versal support.
•
DO NOT store wheels in damp or wet
locations.
•
DO NOT overtighten the nut when mounting
the wheel.
•
DO NOT leave the wheel mounted when
machine is not in use.
•
Use older grinding wheels first and refer to
manufacturer's information to prevent wheels
from outlasting their shelf life.
Model T32720 (Mfd. Since 06/21)
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