Hankook Protec 9NC CNC Flat Bed Lathe 3 Meters – Year 2013
Turning length 4000 mm
Turning Ø 950 mm
Ø above the bed 950 mm
Ø above transversing slide 630 mm
Length between centers 4000 mm
Type of CNC FANUC 21iT
Max workpiece weight 5000 kg
Spindle bore 254 mm
Number of tools on turret 8
Turning speed 1000 rpm
Swing Diameter Over Bed 950 MM
Swing Diameter Over Carriage / Cross Slide 630 MM
Maximum Turning Diameter 950 MM
Maximum Turning Lengh 4,000 MM
Distance Between Centres 4,000 MM
Load Capacity Between Centres 5,000 KGS
Spindle Bore 254 MM
Spindle Speeds 2 – 1,000 RPM
Spindle Speed Ranges 2 – Automatic Selection
Rapid Traverse Rates (X / Z) 4 / 6 M/MIN
Number of Turret Stations 8
Spindle Drive Motor 37/30 KW
Tailstock Quill Travel 250 MM
Electrical Supply 415V, 3PH, 50HZ
Machine Length x Width x Height 6,740 x 2,205 x 1,890 MM
Machine Weight 11,360 KGS
Hankook Protec 9NC CNC Flat Bed Lathe – Technical Evaluation (Year 2013)
1. Technical Evaluation Overview
The Hankook Protec 9NC is a CNC flat bed lathe designed for large-diameter and long-length turning operations. Based strictly on the provided data, the machine offers a maximum turning diameter of 950 mm and a turning length of 4,000 mm, with the same 4,000 mm distance between centers. The stated maximum workpiece weight of 5,000 kg indicates suitability for heavy components within these dimensional limits.
The spindle configuration includes a 254 mm spindle bore, two automatically selected speed ranges, and a maximum spindle speed of 1,000 rpm. The main spindle is driven by a 37/30 kW motor, suggesting adequate torque for heavy cutting operations, though no torque curves or low-speed torque values are specified and should be verified.
The machine is equipped with a turret holding 8 tools and controlled by a FANUC 21i-T CNC system. Rapid traverse rates are stated as 4 m/min in X and 6 m/min in Z. Physical machine dimensions are 6,740 × 2,205 × 1,890 mm, with a total machine weight of 11,360 kg. Electrical supply is specified as 415V, 3-phase, 50 Hz.
Several technical parameters are not provided, including axis travel details beyond rapid rates, guideway type, chuck specification, tailstock type (manual or hydraulic), lubrication system details, and spindle nose standard. These should be confirmed prior to any technical decision.
2. What to Check Before Buying
Given the available information, the following inspections are technically relevant:
Mechanical aspects:
Condition of the flat bed guideways, including wear patterns and alignment over the full 4,000 mm length.
Spindle condition, focusing on bearing noise, temperature stability, and axial/radial play, especially given the large spindle bore and heavy load capacity.
Turret indexing accuracy and repeatability across all 8 stations.
Tailstock condition, including 250 mm quill travel, quill wear, and alignment with the spindle centerline.
Electrical and drive system:
Performance of the spindle motor under load, including smooth transition between the two automatic speed ranges.
Condition of electrical cabinets, cooling fans, and power components compatible with 415V, 3PH, 50 Hz supply.
Verification of axis rapid traverse performance (X/Z: 4/6 m/min) under actual operating conditions.
CNC control:
Operational status of the FANUC 21i-T system, including alarm history, backup availability, and parameter integrity.
Compatibility of the control with existing tooling, programs, and any required communication interfaces.
Confirmation of available documentation, including electrical schematics and CNC parameter lists.
3. Typical Industrial Applications
Based on its stated dimensions, load capacity, and spindle characteristics, this machine is technically suitable for:
Turning of large cylindrical components such as shafts, rollers, and heavy sleeves within a 950 mm diameter range.
Machining of long workpieces up to 4 meters between centers, where stable support and tailstock use are required.
General heavy-duty turning operations in sectors such as energy, general engineering, and large mechanical fabrication, provided material and cutting requirements align with the spindle speed and power limits.
Specific material suitability (e.g., alloy steels, cast iron) cannot be confirmed from the provided information and should be verified through cutting tests or manufacturer data.
4. Common Risks in Used Machines
For used CNC flat bed lathes of this size and category, typical risks include:
Guideway wear over long travel lengths, which may affect straightness and taper control.
Spindle wear or bearing fatigue, particularly in machines used for heavy workpieces near maximum load capacity.
Control system age, as the FANUC 21i-T is a mature platform; condition depends heavily on usage, environment, and maintenance rather than age alone.
Incomplete documentation, such as missing electrical diagrams, CNC backups, or maintenance records, which can complicate troubleshooting and future servicing.
5. Maintenance and Service Considerations
Maintenance requirements depend primarily on the machine’s actual condition and documented service history, which are not provided. From a technical standpoint:
Regular inspection of lubrication systems, way surfaces, and spindle bearings is essential due to the machine’s size and load capacity.
Electrical components should be checked for heat stress and aging, especially in high-power spindle drives.
CNC backups, parameter lists, and alarm logs should be secured before any operational use.
Any long-term service planning should be based on a detailed on-site inspection rather than assumptions about maintenance intervals or spare part availability.
Final Note:
While the provided specifications define the machine’s general capability, several critical technical details are missing. Verification through inspection, documentation review, and functional testing is strongly advised to obtain a complete and accurate technical assessment.
