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1. Sawblades<br />
Cutting edge wear of DP<br />
Mechanical wear of uniform workpiece<br />
materials causes rounding to the main<br />
and minor cutting edges. Apart from<br />
rounding, slight chips caused by foreign<br />
objects can occur when machining<br />
certain wood derived materials.<br />
Rounding of the minor cutting edges<br />
can lead to reduced performance time<br />
and to deterioration in the cutting and<br />
edge quality.<br />
Action:<br />
– Additional lateral eroding at the<br />
tooth relief angle.<br />
This leads to:<br />
– lower lateral tooth projection.<br />
– loss of cutting width.<br />
– higher regrinding costs.<br />
Cutting edge chips and<br />
cutting edge fracture<br />
Hard mineral or metallic objects lead<br />
to cutting edge chips and to a deterioration<br />
in the cutting quality.<br />
Cutting edge chips can also be caused<br />
by inefficient dust extraction (chip flow).<br />
Extreme bluntness and chips lead to<br />
high cutting forces and consequently<br />
cracks in the saw body material.<br />
<strong>The</strong> condition of cutting edges and<br />
saw bodies must be checked regularly.<br />
When the performance time is up, the<br />
tools must be resharpened by experts.<br />
Signs of wear of HW-cutting edges and tools<br />
Worn DP saw tooth.<br />
Cutting edge fracture of a DP saw tooth.<br />
103<br />
1. Sawblades
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