Double-arm jumbo drilling rig DD421

Sandvik DD421 is a two-boom, electro-hydraulic mining development drill offering highly accurate drilling and efficient control, due to adjustable drilling settings that optimize drilling performance. Agile carrier DD421 features an agile frame-steered carrier that facilitates easy tramming in small tunnels. DD421 Development drill rigs Hydraulic controls The hydraulic control system allows for fast, accurate drilling during drifting and tunneling of 8 - 60 square meter cross sections. DD421 Development drill rigs Robust and proven components The compact drilling module allows for multi-directional drilling in low-heading tunnels. This, in combination with a range of well-designed robust components, increases equipment reliability and drilling efficiency. Sandvik DD421 is a powerful twin-boom jumbo drilling rig suitable for up to 60 m² headings. The latest carrier layout has been especially developed to ensure all service points can be safely accessed. It also allows routine maintenance at ground level, while eliminating the need of cover-opening. Sandvik DD421 is a two boom electro-hydraulic jumbo for fast and accurate drilling in drifting and tunneling of 8 - 60 m² cross sections. The improved hydraulic control system with new features enables accurate drilling performance with efficient control. The new Sandvik RD525 rock drill has proven to be an efficient drill with smooth penetration and powerful drilling performance. Optimal coverage is achieved with the proven Sandvik SB60 booms. The drilling performance can be improved with optional instrumentation.