Stihl TSA 230 Instruction Manual page 29

Undercut
Undercutting is a wearing away of the
steel core at or just below the diamond
segments. When cutting road surfaces,
do not cut through into the more
abrasive ballast (gravel, crushed rock)
below, as indicated by a light colored
dust. This can cause excessive
undercutting, resulting in wheel
breakage and/or thrown segments.
WARNING
Immediately replace a diamond wheel if
the core has been severely undercut.
Built-up edges, dressing
Built-up edges are identified by a pale
grey deposit on the top of the diamond
segments that clogs and blunts the
segments.
TSA 230
Built-up edges can form:
when cutting extremely hard
–
material, such as granite,
as a result of incorrect handling,
–
such as applying excessive feed
force.
Built-up edges increase vibrations,
reduce cutting performance and cause
sparking.
Diamond cutting wheels must be
"dressed" at the first sign of built-up
edges. For this purpose, briefly cut into a
more abrasive material, such as
sandstone, aerated concrete or asphalt.
Wet cutting helps to prevent the
formation of built-up edges.
If you continue to use a cutting wheel
with blunt segments, the segments may
soften as a result of excessive heat built
up. The wheel core will also overheat
and lose its mechanical strength. This
can lead to considerable stress, as
clearly indicated by stress cracks and/or
a wobbling movement of the cutting
wheel.
WARNING
Such cutting wheels may break apart or
throw off segments during use or lead to
significant reactive forces, causing
serious or fatal injury. Replace them
immediately.
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