Industrial Stone Drilling Machines

How to Choose a Stone Core Drilling Machine

Selecting the right core drilling machine depends on four factors: the size of the products you are making, your daily production volume, the hardness of the stone you primarily work with, and the automation level your workshop requires.

Step 1 — Define your product dimensions

The most important specification is the diameter of the largest hole you need to drill regularly.

• Products over 300 mm diameter — columns, bathtubs, large vases, deep monolithic bowls: LMZK-600 is the only option.
• Products under 300 mm diameter and 500 mm depth across the full range: ZDZK-300 covers all requirements at a lower capital cost and smaller footprint.
• If your product mix straddles the 300 mm threshold, select the LMZK-600 — it handles both large and small diameters with bit changes, while the ZDZK-300 cannot be extended beyond its rated maximum.
• Reference ranges: standard baluster diameters 100–180 mm; stone bathtub interior 350–550 mm; architectural columns 200–500 mm+.

Step 2 — Assess your production volume

The LMZK-600 gantry structure is designed for continuous multi-shift production. PLC automation enables unmanned multi-cycle runs — the operator sets parameters, loads the workpiece, and steps away during the drilling cycle.

• High-volume batch production (2+ shifts/day, same product geometry repeated): LMZK-600.
• Varied custom work with frequent product changes, mixed stone types per shift: ZDZK-300.
• The ZDZK-300's adjustable worktable configuration makes it faster to reload and reposition between pieces of different sizes.

Step 3 — Consider your stone hardness

Both machines use variable frequency drives to adjust drilling speed based on resistance feedback, protecting diamond bits and preventing micro-cracking in the stone around the drill hole.

• Hard stone (Mohs 6–7): dense black granite, quartzite, basalt composite — the 22 kW motor on the LMZK-600 provides the sustained torque needed to maintain penetration rate without stalling.
• Medium and soft stone: marble, travertine, blue limestone — either machine is suitable. The ZDZK-300's 11 kW motor is sufficient and reduces operating cost per hole.
• Engineered stone and quartz composite: compatible with both models; use a softer bond matrix diamond bit.

Step 4 — Automation and operator requirements

Both models ship with full PLC automatic control as standard.

• The LMZK-600's automation is optimised for batch repetition — program hole depth, diameter, and feed profile once; the machine executes consistently across the production run.
• The ZDZK-300 offers the same PLC control with a more manually adjustable worktable, better suited to variable positioning for mixed-shape workpieces.
• For operations with limited technical staffing or semi-skilled operators, either model's PLC system provides a reliable floor — the machine will not overdrive the bit or exceed programmed depth regardless of material variation.

Quick selection guide of Stone Core Drilling Machines

How to Choose a DTH Drilling Machine for Stone Quarrying

Choosing the right DTH drill for your quarry involves five decisions: rock type and hardness, required hole diameter and bench height, available power infrastructure, environmental and precision requirements, and production scale. Work through the steps below to identify your configuration.

Step 1 — Identify your rock type and hardness

Rock type is the primary driver of DTH performance requirements.

• Granite (Mohs 6–7) and basalt: high compressive strength and abrasiveness require sustained high-impact energy. Standard choice: QKZ90-P or QKZ165-H, with QKZ165-H preferred for high-output bench drilling with large blast patterns.
• Marble (Mohs 3–4) and limestone: sensitive to micro-fracturing from excessive vibration. In marble quarrying, the priority is clean straight holes for wire saw insertion or controlled splitting — QKZ90-E electric model is specifically recommended for lower vibration and zero contamination risk.
• Mixed geology or fractured formations: QKZ90-P pneumatic offers good adaptability to irregular resistance without the torque sensitivity issues that can affect hydraulic systems.

Step 2 — Determine hole diameter and bench height

Hole diameter directly determines the model required.

• Φ65–90 mm (most dimensional stone, pre-splitting, anchor holes, wire saw insertion): both QKZ90 variants are suitable. Choose between them based on power source and stone type.
• Above Φ90 mm up to Φ165 mm (large-scale aggregate quarrying, infrastructure, high-bench granite): QKZ165-H is the required model.
• Bench height guidance: benches under 15 m — QKZ90 series handles depth comfortably. Benches of 15–40 m in high-volume hard rock — QKZ165-H delivers better energy efficiency and straighter holes at depth.

Step 3 — Match power source to site infrastructure

• Pneumatic (QKZ90-P): requires high-pressure air compressor rated at 10–14 m³/min at 20–24 bar. Best for sites already running compressed air, remote sites without stable mains power, and operations where mobility between faces is a priority.
• Electric (QKZ90-E): requires stable three-phase power. Lower operating noise, zero exhaust emissions, lower energy cost per metre drilled vs diesel-powered compressor setups. Suitable for urban quarry environments and sites with environmental permit conditions.
• Hydraulic (QKZ165-H): integrated hydraulic power pack. Sustains extended high-load drilling without pressure fluctuations that can affect pneumatic hammers at depth. Typically paired with crawler-mounted rig configurations for mobility across large quarry benches.

Step 4 — Consider precision and environmental requirements

All three models achieve ≤±5 mm deviation per 10 m depth — sufficient for all standard quarrying applications. Where precision becomes a differentiating factor is in dimensional stone operations where maximising recovery of premium-grade material directly affects revenue.

• For marble and high-value granite quarries: QKZ90-E electric with wet drilling kit provides measurably lower vibration and zero contamination, translating to up to 22% waste reduction and 15% improvement in premium-grade block recovery vs pneumatic DTH.
• For sites with environmental permits on airborne dust or noise: QKZ90-E with wet drilling kit is the compliant configuration without additional mitigation equipment.

Step 5 — Scale and throughput

• Under 500 metres drilled per day: either QKZ90 variant is suitable; model choice reduces to rock type and power availability.
• 500–2,000 metres per day in hard rock: QKZ165-H's larger hammer class and higher sustained impact rate provide better productivity per machine at this scale.
• Multi-rig fleet operations: Dinosaw can supply matched configurations with standardised bit consumables across the fleet to simplify spare parts management and reduce downtime between bit changes.

Quick selection guide of DTH Drilling Machine