Caterpillar has released the MD6420C Rotary Drill for hard- and soft-rock applications. With a bit load force of up to 42,000 kg, and the ability to drill holes up to 311 mm in diameter and down to 74.3m deep, the new drill is suitable for high-volume production. ItS power train, advanced control systems, optional automation features and rugged structures make it an efficient drill for mining, aggregates, and heavy construction applications.
The drill comes with three power train packages that match a variety of applications: cat C32 engine (with 56.6 m3/min @ 6.9 bar compressor); cat C32 engine (with 42.5 m3/min @ 10.3/24.1/34.5 bar compressor); cat C32 engine (with 73.6 m3/min @ 6.9 bar compressor)
Major power group components including heavy-duty coolers and high efficiency hydraulics work together with the engine and air compressor as an integrated system to enable optimal bit load, penetration rates, and cycle times.
Other features that reduce cycle time include the cat undercarriage, which allows fast tramming from hole to hole. The mast can be raised or lowered in less than 40 seconds, even with a pipe rack and full drill string.
The MD6420C uses advanced control technology to enhance drilling precision and operator productivity. It includes an easy-to-use interface as well as machine health and diagnostic capabilities. An optional automation feature controls each step in the drill cycle to improve drilling accuracy.
The Cat MineStar Terrain for drilling can be added to the MD6420C for a higher level of automation. Terrain is a scalable system that enhances drilling efficiency and allows remote, real-time monitoring of drilling activity and blast planning. It guides the operator, improves accuracy of hole placement and drilling depth, reports on drill and operator productivity, and delivers feedback on variation of bench geology.
The cab is spacious with wide walkways and two cab doors to make entry and exit easy. It features a high efficiency HVAC system, low sound levels, and twelve tinted windows – including a floor-to-ceiling drill window – increasing visibility. In-cab pipe handling and bit changes promote also bolster operator safety.
The MD6420C structures are designed to deliver a 60,000-hour service life. A rugged mainframe and A-frame provide the structural integrity required for full utilisation of the pulldown power. The heavy-duty frame is sculpted and heavily cross-braced in high-load areas. It has a tubular, box-section design that exceeds the life expectancy of a slimmer I-beam design. On the MD6420C, Caterpillar welds all critical components to the mainframe, including the four leveling-jack casings, the mast pivot and the drill deck.
Mast structures are designed with double-cut lacing in high stress areas and are built for the life of the machine, compared to mid-life on competitive machines.
The drill travels on a rugged Cat excavator undercarriage that features three-point oscillating suspension, which allows the machine to negotiate rugged terrain without transferring excessive torsional forces to the mainframe. Lower stresses translate into longer life and lower costs.