During January,' Sandvik unveiled the DR460 rotary blasthole drill at its manufacturing facility in Alachua, Florida. It is a diesel-powered, crawler-mounted unit that drills 251- to 311-mm (9-7/8- to 12-1/4-in.) diameter blastholes. Sandvik said they have designed the drill for mines prioritizing high penetration rate, easy maintenance, good availability and an ergonomic work environment. All mechanical and hydraulic systems are enhanced compared with existing models. For example, with 194 kW (260 tip) input on the multi-pass machine, the DR460 has 38 percent more rotary horsepower than typically seen in this size class. Tim Murphy, vice-president Surface Mining Drilling at Sandvik said: "When ground conditions allow, the operator can increase his rotation without sacrificing torque, to gain penetration rate without stalling." The feed system has been designed with extreme hard rock in mind by including extra heavy duty chains to ensure a constant load at increased rotation speeds.
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