84 4. STRAIN GAUGE TECHNIQUE: METHOD DESCRIPTION
judgment. Except when used for drilling very soft materials, drills should be discarded
after completion of one hole and a new drill used for the next hole.
(a) Hole with “clean” edge (b) Hole with blurred edge
Figure 4.12: Inspection of drilled holes (photos courtesy of Stresscraft Ltd.).
Figure 4.13: Inspection of a worn drill after completing the drilling process (photo courtesy of
Stresscraft Ltd.).
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