The twin boom of underground jumbo

Overview
The term "twin boom" in the context of underground jumbos likely refers to a specific design feature in these machines used in mining and tunneling operations. Underground jumbos, also known as jumbo drills or jumbo rigs, are specialized drilling vehicles used for the excavation of tunnels and other underground structures. The "twin boom" configuration is a distinctive design element that enhances the functionality and efficiency of these machines.

Here's an explanation of the "twin boom" feature:

Dual Booms: The "twin boom" configuration involves the use of two separate booms (long, horizontal arms) mounted on the jumbo. Each boom is typically equipped with a drilling apparatus, such as a hydraulic rock drill, allowing the jumbo to drill in two different directions simultaneously. 
Increased Coverage: The primary advantage of the twin boom design is the ability to cover a larger area during drilling operations. With two booms working independently, the jumbo can drill holes in multiple directions without having to reposition the entire machine. This results in increased efficiency and a faster rate of tunnel excavation. 
Improved Productivity: The dual boom system enhances productivity by allowing the jumbo to perform various drilling tasks concurrently. For example, one boom may be drilling the face of the tunnel, while the other boom is creating holes for rock bolts or other support structures. This multitasking capability is crucial for optimizing the excavation process. 
Versatility: The twin boom design adds versatility to the jumbo, enabling it to adapt to different geological conditions and tunnel shapes. The operator can control each boom independently, directing drilling operations precisely where needed, whether it's for face drilling, roof bolting, or other tasks. 
Reduced Machine Movement: Because the jumbo can cover a larger area without moving the entire machine, there is a reduction in the need for repositioning. This results in time savings and minimizes the wear and tear on the equipment.

In summary, the twin boom configuration in underground jumbos is a design innovation that enhances drilling efficiency, productivity, and adaptability in tunneling and mining applications. It allows for simultaneous drilling in multiple directions, making it a valuable tool for excavation projects in complex underground environments.