CK6140 Flat Bed CNC Lathe – Rigid Cast Bed, 400 mm Swing, GSK / FANUC CNC

1. Heavy-Duty Flat Cast Iron Bed – The Foundation of Turning Accuracy

The CK6140 uses a one-piece HT250 cast iron flat bed that is stress-relieved through natural and thermal aging before machining. The flat bed layout provides a wide guideway span and a low center of gravity, which is well-suited for turning long steel shafts up to 1500 mm in length. Compared with lighter fabricated structures, a high-rigidity cast bed absorbs vibration during interrupted cutting on cast iron flanges or forged shafts, which directly translates into better surface finish and longer tool life.

2. Hardened & Ground Guideways – Wear Resistance Over Tens of Thousands of Hours

The X and Z axes of the CK6140 run on rectangular sliding guideways that are induction-hardened to HRC 50–55 and precision ground. This combination of a hard contact surface with full guideway coverage delivers excellent damping and load-carrying capacity, which matters when taking deep cuts on 45# steel or 40Cr shafts. Sliding guideways generally outperform linear rolling guides in heavy roughing applications because of their higher contact area, while still maintaining positioning repeatability suitable for most shaft, sleeve, and flange work.

3. Precision Spindle with Tapered Roller Bearings – Stable Rotation Under Heavy Load

The CK6140 spindle adopts a P5-class tapered roller bearing arrangement (front and rear support), driven by a 7.5 / 11 kW AC main motor through a 2-stage gearbox. The standard Φ52 mm spindle bore (Φ82 mm optional) accepts bar stock for batch production, while the gearbox delivers high torque at low speeds for roughing and high RPM up to 1800–2000 r/min for finishing. This wide torque-speed range is exactly what shaft and pulley manufacturers need to keep cycle time low without sacrificing surface quality.

4. 4-Station Electric Turret and GSK / FANUC CNC – Reliable and Easy to Maintain

The standard 4-station electric turret has a 1.5-second indexing time and uses Hirth coupling for repeatability within ±0.005 mm. The CNC system is typically GSK 980TDi for cost-sensitive markets, or FANUC 0i-TD / Siemens 808D for export and higher-end applications. All three control options support G-code programming, tool-nose radius compensation, and constant surface speed turning – the standard feature set required for shafts, threaded parts, and tapered components. Spare parts availability and operator familiarity are key reasons these controls remain the industry default in this machine class.

5. Balanced Configuration – Why CK6140 Remains the Workhorse in This Class

The CK6140 is not designed to chase extreme speed or accuracy figures. Instead, it represents a balanced engineering choice: a heavy bed, hardened sliding guideways, gearbox-driven spindle, and proven CNC control. This balance is exactly why this model has remained the most-sold horizontal CNC lathe in the 400 mm class for over two decades. For shops doing 70 % roughing + 30 % finishing on steel, cast iron, and non-ferrous parts, the configuration matches the actual workload – which is the real definition of cost-effectiveness.

➡️ For complete specifications, a process evaluation for your parts, or a tailored configuration recommendation, click here to contact the HAIDI Machine technical sales team.