How to Choose DHD350 DTH Bit

Date: Oct. 11, 2024

A DTH (Down-The-Hole) button bit is designed for efficient rock drilling, featuring tungsten carbide buttons on its face that effectively crush and break rocks as the bit rotates. It operates in conjunction with a DTH hammer, which provides direct percussive blows to the bit. This combination enables the bit to break rock efficiently, facilitating faster and deeper drilling operations. Available in a range of sizes and configurations, these bits can adapt to various drilling depths and rock conditions. The selection of button shape, size, and arrangement significantly influences the bit’s performance and penetration speed. This article will use the DHD350 model as an example to guide you through the process of choosing the appropriate DTH drill bit.

Selecting the appropriate DHD350 DTH button bit involves understanding its specifications tailored to different drilling needs:

1. **Diameter & Inch Size:** Ranging from 140mm (5 1/2 inches) to 152mm (6 inches), these bits offer options to match varying hole sizes required for drilling operations.

2. **Button Configuration:** The bits feature a combination of 7 or 8 larger buttons (18mm) and smaller ones (14mm), arranged either on a flat face or a concave/convex face. The flat face design suits general use, while the concave/convex option enhances performance in specific rock types by concentrating stress for better fragmentation.

3. **Face Design:** The choice between flat and concave/convex faces influences how the bit interacts with the rock, affecting both drilling efficiency and the lifespan of the bit.

4. **Button Type:** DHD350 bits utilize both spherical and ballistic buttons. Spherical buttons are resilient and excel in hard, abrasive conditions, ensuring longevity even in challenging terrains. Conversely, ballistic buttons prioritize rapid penetration in softer rocks but may not be as durable when faced with harder strata.

**Guidelines for Selection:**
– **Rock Hardness:** For and abrasive  formations, opt for bits with spherical buttons and possibly a flat face for enhanced durability.
– **Drilling Efficiency:** In softer rock layers, ballistic buttons facilitate quicker penetration. A concave/convex face might be beneficial for more efficient rock breaking.
– **Bit Diameter:** Match the bit diameter to the required hole size for your specific application.
– **Configuration Adaptability:** Consider the specific geological conditions and choose the button configuration (number and size) that best suits those conditions.

By carefully considering these factors, you can select the most fitting DHD350 DTH button bit to maximize efficiency and durability in your drilling operations.