Stihl TS 500i STIHL Cutquik Instruction Manual - Page 23

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 can form: - when cutting extremely hard material, such as granite, - as a result of incorrect handling, such as applying excessive feed force, - if extremely large sections are cut without a pendulum movement (back and forth in the cutting plane). 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 a more abrasive material, such as sandstone, aerated concrete or asphalt. Wet cutting helps to prevent the formation of built-up edges. English 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. Built-up edges are identified by a pale grey deposit on the top of the diamond segments that clogs and blunts the segments. 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. TS 480i, TS 500i 21