Choosing the wrong DTH Machine for hard rock drilling or slope support leads to project delays and high diesel waste. From our experience helping over 300 international contractors, nearly 40% of first-time buyers overspend simply due to wrong air pressure or incorrect drill pipe choices.
This guide breaks down the core technical specs you must check before buying a DTH drilling rig, helping you secure the best configuration within your budget.
DTH Machine Parameter
| Item | YG729S | Description | Diesel&Electric Surface Down The Hole Drill Rig |
| Diesel engine | Yu chai & Electric motor | Lifting force | 50 kn |
| Rated Power | 60/55 KW | Method of Feed | Oil cylinder +roller chain |
| Drilling hardness | f=6~20 | Travelling speed | 0~2.5km/h |
| Drilling diameter | 90-220 mm | Climbing capacity | 25° |
| Depth of economic drilling | 50 m | Ground clearance | 400 mm |
| Suitable Drilling rod | φ76mm*3m | Weight of the complete machine | 6000 kg |
| Suitable DTH hammer | 4″ /5″ /6″ | Outer dimensions(L*W*H) | 6050*2200*2600 mm |
| Working Pressure | 1.0~2.0Mpa | Volume of diesel oil tank | 70 L |
| Air consumption | 11~21m³/min | Method of dust collecting | Optional |
| ***We accept customer customization. Please consult the seller.*** | |||
Note: The maximum economic depth for a DTH Machine is 50 meters, with a max bit size around 250mm for standard budgets.
💡 Pro Tip: Share your hole diameter and target depth with your supplier first. It saves 80% of back-and-forth communication time.
What Is a DTH Machine and How Does It Work?
A DTH Machine (Down-The-Hole drill) uses an impactor that goes directly into the bottom of the hole to crush rock. Unlike top hammer drills, a down the hole drilling machine loses almost no impact energy as the hole gets deeper.
- Standard Drilling Depth: Easily handles blast holes from 15 meters to 50 meters in hard rock.
- Hole Diameter Range: Covers engineering holes from 70mm up to 250mm.
- Core Configuration: Includes the drill rig frame, air compressor, drill rods, and the end DTH hammer with button bits.
💡 Pro Tip: If your drilling depth exceeds 15 meters, select a DTH drilling rig right away. Top hammer drills lose penetration speed quickly beyond this depth.
Where Is a DTH Machine Used in Industry?
Depending on terrain and geology, a DTH Machine serves vital roles across several key fields:
- Open-pit Mining and Quarrying: Drills clean blast holes to break massive rock blocks efficiently.
- Slope Support in Roads and Railways: Drills precise anchor and bolt holes on steep or rugged slopes.
- Water Conservancy and Reef Blasting: Operates in reservoir construction and underwater dredging projects.
- Foundation and Construction: Prepares solid foundation holes for heavy structural support.
💡 Pro Tip: For jobs on roadless, rough mountain slopes, pick a portable split DTH Machine. Its modular components allow easy manual transport.
How to Match DTH Machine Tools for Soil vs. Rock?
Before ordering your DTH drilling rig, confirm your geological conditions. Soil and hard rock require totally different drilling tools.
- Soft Soil and Clay Layers:
- Drill Rods: Must use Twist Drill Rods.
- Drill Bits: Pair with Three-wing Alloy Bits.
- Air Needs: Dry soil requires air compressors for hole cleaning. Only specialized 110-type hydraulic models can skip air compressors in pure clay.
- Hard Rock Formations:
- Drill Rods: Use heavy-duty Round Steel Drill Rods.
- Drill Bits: Must feature a pneumatic DTH Hammer and Alloy Button Bit.
💡 Pro Tip: Never use round steel rods in soft clay. Sticky mud will block the air holes and freeze your drill pipe in the ground.
Should You Choose a Split or Integrated DTH Drilling Rig?
When evaluating a crawler-type DTH drilling rig, you must weigh cost against mobility:
- Split DTH Drilling Rig: The drill crawler and air compressor stay separate.
- Pros: Lower initial machine cost, simple maintenance, lighter transport weight.
- Cons: Requires dragging high-pressure air hoses on site, needs a two-man crew.
- Integrated DTH Drilling Rig: The air compressor and diesel engine sit directly on the crawler chassis.
- Pros: Excellent mobility, single-operator control, no hose dragging, comes with auto dust collectors.
- Cons: Higher upfront investment.
💡 Pro Tip: If you work on flat ground with a strict budget, split models give great value. For large active quarries, integrated models save massive labor time.
How Does Site Power Affect Your DTH Machine Drive System?
Local power supply dictates which power configuration your DTH Machine needs:
- Power Supply Available:
- Option A: Air-electric DTH Machine + 6 m³ Electric Air Compressor.
- Option B: Full Pneumatic DTH Machine + 12 m³ Electric Air Compressor.
- No Power / Remote Fields:
- Option A: Full Pneumatic DTH Machine + 12 m³ Diesel Air Compressor.
- Option B: Air-electric DTH Machine + 6 m³ Diesel Air Compressor.
- Option C: Electric DTH Machine + Electric Air Compressor + On-site Diesel Generator.
Real Field Case: How an Oman Quarry Contractor Upgraded Operations
- Client Profile: Mr. Said, a quarry contractor based in Muscat, Oman.
- The Challenge: His team suffered constant machine breakdowns on rough rock slopes. Dragging air hoses burned valuable working hours, leaving his quarry output behind schedule.
- YG Machinery Solution: We provided an integrated YG-420 model DTH drilling rig equipped with a high-pressure diesel onboard compressor and an industrial dry dust collector.
- Actual Outcome: Drilling speed per 150mm hole increased by 35% on site. Better dust collection cleared field visibility, letting operators complete more holes per shift and cutting project completion time by two weeks.
Frequently Asked Questions (Q&A)
Yes. When paired with adequate air compressor capacity, twist drill rods, and three-wing alloy bits, a pneumatic unit drills soft soil cleanly.
Standard crawler DTH Machine units adjust freely from 0° (horizontal drilling) to 90° (vertical drilling), meeting all blast hole and anchor needs.
Large integrated rigs can do this technically. However, for entry budgets, 250mm is the practical limit. Beyond 250mm, drilling depth drops significantly unless you upgrade to heavy rigs.
Final Thoughts for Buyers
Buying a DTH Machine isn’t about picking the most expensive unit—it’s about matching parameters. Once you define your geology, hole size, depth, and field power, the right setup becomes clear.
Planning your next rock drilling or slope project? Reach out to the technical team at YG Machinery today for a custom setup recommendation and a free factory quote!
