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diamond coring
The evolution of these progressive scientific coring systems began with the Rotary Core Barrel (RCB) used by the DSDP and proceeded to the highly advanced Diamond Coring System (DCS) currently under development by ODP engineers.
      
These included hydraulic piston coring, extended coring, pressure coring, bare rock spudding and several systems using high speed diamond coring technology.
      
These include the positive displacement coring motor (PDCM), the "Navi-drill" core barrel, and a top driven diamond coring system (DCS).
      
Minicores were taken from the dredged basalts using 2.00and 2.54-cm-diameter diamond coring bits.
      
One of the most critical is to complete the development of the diamond coring system such that the entire crustal units can be sampled.
      
Pucks of nacre, 3 mm in diameter, were drilled from these shells using a diamond coring drill.
      
The holes were cored in to the base material with the Hilti DD 100 diamond coring system.
      
 

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