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render them useless. Soft wheels give themselves up while
grinding.
When grinding, only a small amount of material is removed,
and the wheel releases grains a little at a time, presenting new
TABLE 2
WHEEL HARDNESS
(GRADE)
A B C D
E F G H I J K L
M N O P Q R S T
U
V W X Y Z
The following table 3 should help you to select the correct
grinding wheel for the job.
TABLE 3
TYPE OF TOOL
Drill bits
Spade boring bits.
Masonry drill bits
Lathe tool bits
Chisels
Router bits
High-speed steel carbide tipped
Rotary lawnmower blades
Scissors & snips
USES FOR DESIGNATED HARDNESS
Not used very often
Use these soft wheels to sharpen high-speed-steel tools,
such as router bits, drills, and tool bits.
Use these wheels for rough grinding on soft materials
This hard grade is used for dressing sticks to dress grinding
wheels.
Not used very often
TOOL MATERIAL
High-speed steel
High-speed steel
Cutting edge is carbide
High-speed steel
High-speed steel
High-speed steel
Cutting edge is carbide
Non heat-treated steel
Hard steel (but not file hard)
cutting edges. This releasing activity helps to keep the tool from
heating up and gives a finer grinding result.
Table 2 shows wheel hardness and uses.
New bench grinders are supplied with grey wheels. All
other types of grinding wheel are available from your
tool stockist.
RECOMMENDED WHEEL TYPE
Aluminium oxide (grey)
Aluminium oxide (grey)
Silicon carbide (green)
Soft aluminium oxide (Pink or white)
Soft aluminium oxide (Pink or white)
Soft aluminium oxide (Pink or white)
Silicon carbide (green)
Aluminium oxide (grey)
Aluminium oxide (Pink or white)
23
GB
DESCRIPTION OF HARDNESS
Very soft
Soft to medium
Medium to hard
Hard
Very Hard
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