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• Single-operation cutting must be restricted to cutting depths of 20 mm or less, at slow feed speed. Cutting
at deeper than 20 mm must be done in two or three separate cutting operations. Attempting single-
operation cutting at deeper than 20 mm will shorten the service life of the diamond wheel, and could
cause motor burnout.
• Zigzag, angled or curved cutting, the use of the side-face surface of the wheel, or other irregular cutting
operations will seriously shorten the service life of the diamond wheel, and must be strictly avoided.
• As cutting operation produces dust and chips, the operator should always wear protective goggles and a
dust mask.
D. Diamond wheel service life
The service life of a diamond wheel depends on the type of work, the operator's level of skill, and the type
and quality of the diamond wheel itself. The table below shows the average service life expectancy for the
diamond wheel when used for the normal cutting of concrete. (Diamond wheels are optional accessories.)
Dry or wet
Concrete
Dry
(Compressive strength: 240 kg/cm
Concrete
Wet
(Compressive strength: 240 kg/cm
E. Diamond wheel
As illustrated in Fig.1, the diamond wheel consists
of a thin layer of diamond material permanently
fused to the outer circumference of the wheel
base material. The diamond layer consists of
diamond grain and its bonding agent.
F. Diamond wheel clogging
For diamond grain containing BOND, the degree of abrasion varies depending on the type of material being
cut and the cutting speed. When the cutting particles produced are large, the degree of abrasion quickly
expands, and the wheel cuts into the material very well. However, the degree of abrasion is less when the
cutting particles produced are very small, thereby reducing the effectiveness of cutting. In such case,
additional force applied in an attempt to speed up cutting will cause sparks to fly around the outer
circumference of the diamond wheel due to a phenomenon known as "clogging."
In the event of clogging, do not apply additional force. Instead, withdraw the cutting edge of the wheel from
the material, wait a moment, and then reapply the cutting edge to the material with little pressure. Then,
when effective cutting is restored, normal cutting operation can be continued. This process is known as
"dressing."
Workpiece
2
)
2
)
Diamond wheel
105 dia. diamond wheel
(Segment type)
110 dia. Diamond wheel
(Rim type)
Fig. 1
Cutting grain
(Diamond)
-6-
Cutting depth
Service life
10 mm
Approx. 200 m
20 mm
Approx. 200 m
Bonding agent (BOND)
Diamond layer
Wheel base
Slit
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