DNC-850 CNC Deep Hole Drilling Machine

Precision Engineering for Industrial Deep Hole Drilling

The DUOMI DNC-850 CNC deep hole drilling machine is a specialized, high-rigidity machining solution designed for deep drilling operations requiring extreme axis straightness, tight hole tolerances (IT8–IT11), and fine surface finishes. Built specifically for demanding production environments, this purpose-built CNC deep hole drilling machine combines heavy-duty structural dampening with state-of-the-art servo motion to deliver repeatable performance shift after shift.

Whether executing small-diameter precision gun drilling (Ø1.5 mm – Ø2 mm) or high-efficiency U-drilling (Ø15 mm – Ø40 mm) up to a maximum depth of 250 mm, the DNC-850 guarantees minimum axial deflection (0.05 / 100 mm) and smooth chip evacuation across hard alloys, stainless steel, and non-ferrous metals.

Core Technological Advantages

1. High-Rigidity One-Piece Structure

Constructed with an extra-wide base and a stability-enhancing herringbone-style column, the monolithic cast frame absorbs structural vibrations during continuous cutting. This dampening capability prevents tool chatter, extends cutting tool service life, and maintains strict concentricity during deep hole drilling CNC procedures.

2. Taiwan SYNTEC Control System & Full Servo Drive

Powered by an intuitive Taiwan SYNTEC CNC controller, the machine allows fast program entry, real-time tool load monitoring, and flexible macro control. Paired with full servo drives on all axes, the system executes smooth feed movements with a positioning accuracy of ±0.02mm and repeatability of ±0.02mm.

3. DANNCHUAN Mechanical Servo Spindle

Featuring a high-performance Taiwan DANNCHUAN servo mechanical spindle (11 kW motor, 8,000 RPM, BT40 taper), the system maintains constant torque delivery across varying feed speeds. Superior rotational balance delivers refined surface finishes reaching Ra 0.8 μm under optimized cutting parameters.

4. High-Pressure Through-Spindle Coolant System

Efficient chip management is critical in deep drilling machine applications. The integrated 400 L cutting oil reservoir with a 5.5 kW high-pressure pump delivers through-spindle coolant up to 150 kg/cm² at a flow rate of 40 L/min. Multi-stage filtration—utilizing dual magnetic separators, filter bags, and double-layer paper filters down to 0.2 mm—ensures particulate-free oil re-circulation and consistent thermal stabilization.

5. API Laser Measurement Calibration

To guarantee international ISO precision standards upon installation, every DUOMI CNC deep hole drilling machine undergoes laser interferometer verification using an American-imported API laser metrology system to measure and compensate for positioning pitch errors prior to factory sign-off.

Industrial Applications & Material Capability

The DNC-850 CNC deep hole drilling machine is optimized for diverse sectors including automotive mold making, aerospace hydraulics, medical device manufacturing, and oil & gas manifold production.

• Compatible Materials: Carbon Steel (45# / S45C), Tool Steel, Stainless Steel (304/316), Titanium Alloys, Inconel, Hastelloy, Cast Iron, Brass, Bronze, and Tungsten Carbide.
• Typical Components: Injector nozzles, hydraulic valve blocks, mold cooling channels, transmission shafts, and heat exchanger tube sheets.

Environmental Safety & Operational Longevity

• Automatic Lubrication System: Programmable, timed, and metered oil distribution preserves the precision HIWIN / TBI ball screws and linear guideways.
• Full Machine Enclosure & Oil Mist Collector: Protects workshop air quality, ensures operator safety, and meets CE safety requirements.
• Axis Travel Limit Protection: Hardware and software limit switches across X (800 mm), Y (500 mm), and Z (520 mm) axes protect against mechanical crashes and operational error.