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or Multiple Cracks
Description
Numerous cracks travelling in non-uniform directions.
Causes
- Wear ring generated during wire drawing process.
- Misaligned die during mounting process induces stress.
- Excessive thermal damage either from laser, sintering, wire drawing or re-cutting.
- Thin diamond wall from oversize bore diameter.
Rough
Diamond Surface
Description
A rough diamond surface is an area in the bore hole that is difficult or impossible
to polish due to voids between the diamond crystals. This area can be granular
in appearance. Pull out of diamond crystals may occur due to melting of the cobalt
secondary phase between the diamond grain.
Causes
- Excessive thermal damage either from laser drilling, sintering or wire drawing.
- Wear caused from interrupted lubrication.
- Unsintered diamond or cold spot. Usually isolated to a localized region of
the diamond table.
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