is the specification?
A typical grinding wheel
specification consists of the grit type, the grit size, the hardness,
the structure and the bond.
A typical grinding wheel specification would be A60-I10-VS. 'A'
is the grit type (aluminum oxide), '60' is the grit size, 'I' is the
relative hardness, '10' is the structure, and 'VS' is the type bond.
What is the grit type?
Grit type is either aluminum oxide (white, pink,
ruby red, brown, grey, etc.) silicon carbide (black or green), ceramic
(blue and pink) or any combination of these.
Grit types are sometimes mixed in combination
for achieving certain cutting characteristics. Aluminum oxide is
friable (white) or semi-friable (pink, brown and grey, red, etc.).
Friable grit breaks down more easily and is useful for cutting harder
What is grit size?
Grit size typically runs from coarse (16 -24 grit),
medium (36 - 60 grit) and fine (80-120 grit). Superfine grits
run from 150 and higher. Grinding wheels usually will be between
24 and 100 grit. Honing stones and jointing stones and other
polishing abrasives will be 150 grit and higher. Use a coarse
grit for fast, aggressive stock removal and finer grits for less stock
removal but better surface finish.
Hardness is rated from A-Z
with 'A' being the weakest bond and 'Z' being the strongest. A
weak bond is preferred for grinding harder materials while a
stronger bond is desired for softer materials. A typical weak
bond for steel would be in the 'F, G or H' range. A medium
hardness would be in the 'I, J or K' range. And stronger bonds in the
'L, M, or O' range. Hardness is dependant on the grit type, the
material being ground, the amount of stock removed, and a number of
Structure is basically the
spacing between abrasive grains. An open structure would be 12
or higher while a closer structure would be 6 or so. Here again,
the structure depends on a variety of factors not the least of which
is how difficult the material is to grind.
the bond type?
There are various bond types
but the most common are vitrified and resin. Vitrified wheels
are commonly used for bench, surface and tool room applications such
as surface grinding while resin wheels are commonly seen in cutoff
wheels, centerless wheels and superabrasive wheels (diamond & CBN).
Newer bonds are Plastic bonded wheels based on high technology from
companies such as RESEARCH ABRASIVE.
Can I use
a diamond wheel on steels?
No. A diamond wheel is
specifically used for carbides, plastics and other synthetic
materials. It will not grind steel at all.
Can I use
a CBN wheel on carbide?
The short answer is no.
While you can use a CBN wheel on carbide, it will not work well at
Will the same product from two different
manufacturers perform the same if they are marked the same?
This is a hard question to answer in a short space.
While the markings mean the wheels should perform the same,
differences in factory equipment and marking systems may make one
product behave differently than another. They should be close,
but the only true way to match a product is to have a wheel analysis
done by the factory. We do this for no charge and it is
recommended for larger purchases to eliminate testing. Note that
even when an analysis is done, it is no guarantee the wheels will
perform exactly the same.
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Why do you have a $75.00 minimum order amount? Many other
internet companies do not charge this. I think this is a poor
We are a small company and are not really staffed to
take care of a large volume of small orders and the associated high
volume of support and return issues. We are better geared to
serve the business enterprise rather than the home or hobby user
(which are already well served by other companies). Yes, we
realize that many small purchases come from larger companies and
potential future larger volume customers but please realize that we
simply do not have enough employees to handle a large volume of orders
at this time. We may reevaluate this in the future as our
I am thinking about designing my own web site and I really like some
or all of the features of Georgia Grinding Wheel's site -- How can I
find out how you did it and would you be willing to share the details
Thank you for your interest. We are always
willing to share with others as this is how we relied on the
development of our site in the beginning. We have a very
talented webmaster who you can contact directly. Please
click here to contact our
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