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What Material?Hammer drills are best thought of as conventional electric drills with added internal gearing that provides a percussive action. This rapid in-and-out movement of the bit, combined with the usual rotation, greatly increases the tool''s efficiency in drilling concrete or other masonry. The hammer action can be switched off to allow general purpose drilling in materials like wood or metal.In addition to allowing the user to choose between hammer-drill and drill-only modes, most hammer drills feature two-speed gearing. The higher speed, typically around 2,500 rpm, is best for fast drilling with small-diameter bits; the lower speed offers better performance off with larger bits road and high-torque applications. This flexibility makes the tool a favorite of mechanical installers and remodelers.

DRILLING EQUIPMENT: Drawworks--one Nat''l1320 UE; Pumps--two Nat''l 10-P-130 Triplex;Prime movers--five Cat. D-399TA; RotaryTable--Nat''l 0-375.DERRICK: 147''; Pyramid; 1,392,000 lb hook load.BOP SYSTEM: CIW 10,000 psi.CRANES: Two 33t.MOORING: Three x 5.44 t.WORK AREA: Bohai Gulf, China.BOHAI NO. 5RIG DESIGN: Bohai Oil Corp. VHT-904.CONSTRUCTION: Dalian Shipyard, China, 1983.PERFORMANCE: Water depth--40 m; Drilling depth--6,000 m.QUARTERS: 102.HULL: 76 m x 34 m x 5.5 m.VARIABLE LOAD: 1,500 t.HELIPORT: 17.2 m x 18.5 m.