C5126 Single‑Column CNC Vertical Lathe – 2,600 mm Turning Diameter, Hydrostatic Guideway, and 37 kW Main Drive for Heavy‑Duty Large‑Diameter Machining

Why large‑diameter workpieces need a vertical lathe

For workpieces where diameter significantly exceeds length – large flanges, bearing rings, gear blanks, valve bodies, pump casings, wind tower flange sections, and heavy machinery housings – a vertical lathe offers clear advantages over a horizontal counterpart. The vertical orientation uses gravity to assist loading and clamping, chips fall away from the cutting zone, and the table is supported over a large area, providing higher static and dynamic rigidity. The HAIDI Machine C5126 is designed to maximize these benefits while keeping the investment accessible.

The C51 series single‑column vertical lathe has long been a practical solution for large diameter turning, and the C5126 represents the upper end of this series, bridging the gap between smaller 2,000 mm class machines and larger double‑column configurations.

Generous work envelope and load capacity

The C5126 offers a maximum turning diameter of 2,600 mm and a maximum machining height from 1,350 mm (standard) up to 2,000 mm (optional). This accommodates large flanges up to 2.5 meters, wind turbine bearing rings, heavy machinery gear blanks, valve bodies, and large pump casings.

The 2,300 mm worktable is supported by a hydrostatic guideway system, providing smooth rotation and high load‑carrying capacity. Maximum workpiece weight is 10 to 15 tons depending on configuration – sufficient for most medium‑to‑large castings and forgings in energy, heavy equipment, marine, and general engineering sectors.

Spindle and drive system

The main drive uses a 37 kW AC motor, delivering a speed range of 1.2 to 80 r/min (some configurations offer 2–63 r/min). The gearbox provides 16 discrete speeds, allowing optimal cutting speed selection for different materials and part diameters. The transmission uses 40Cr ground gears (6–7 grade), resulting in quiet operation, low vibration, and high transmission efficiency even under heavy loads. Speed changes are controlled via electronic encoder‑driven solenoid valves.

A key feature is the hydrostatic worktable guideway. A constant‑flow oil distributor supplies pressurized oil to multiple pads, creating an oil film that completely separates moving surfaces. This provides three practical benefits: no wear over time, high vibration damping that absorbs cutting‑induced chatter, and no stick‑slip even at very low speeds. For large‑diameter parts requiring fine surface finishes, the hydrostatic table is a significant advantage.

Spindle bearings and rotational accuracy

The spindle is radially supported by precision NN30‑series double‑row short cylindrical roller bearings (Class D) with tapered inner rings that allow radial clearance adjustment during assembly. Axial loads are carried by large ball thrust bearings. This arrangement provides excellent rotational accuracy and high load‑carrying capacity for heavy turning cuts.

Single‑column cast iron structure

The base, column, crossrail, ram, and other major castings are made from high‑strength gray iron using lost‑foam resin sand casting. All castings undergo two‑stage stress relief – artificial aging plus vibration treatment – to eliminate residual stresses and ensure dimensional stability. Sliding surfaces are hand‑scraped and induction‑hardened (HRC 50+) to extend service life.

Crossrail and tool posts

The C5126 is equipped with a vertical tool post (standard) and an optional side tool post. Key specifications:

• Vertical tool post horizontal stroke: 1,600 mm

• Vertical tool post vertical stroke: 1,000 mm

• Side tool post horizontal stroke: 730 mm

• Side tool post vertical stroke: 900–1,180 mm

• Tool post swiveling range: ±30°

• Maximum tool shank: 30×40 mm or 35×45 mm

• Feed range: 0.8–86 mm/min (12 steps)

• Rapid traverse: 1,800 mm/min

Both tool posts are driven by AC servo motors with ball screw transmissions. The crossrail is driven by an AC motor (lifting speed ~350–440 mm/min) with hydraulic clamping.

Accuracy and surface finish

Typical achievable precision includes:

• Machining accuracy: IT6–IT8 grade

• Roundness: 0.01–0.015 mm

• Cylindricity: 0.015–0.02 mm

• End face flatness: 0.02 mm

• Surface finish: Ra 3.2–6.3 µm

Standard equipment includes a digital readout (DRO) system for real‑time position feedback.

Practical features and options

• Lubrication: Centralized automatic lubrication to all guideways, ball screws, and bearings.

• Chip management: Chips fall onto trays or optional chain‑type chip conveyor.

• Operator convenience: Pendant control station with all machine keys.

• Optional upgrades: CNC control (Siemens, Fanuc, GSK), increased height (to 2,000 mm), side tool post, chip conveyor, high‑pressure coolant, hydraulic chuck, full/semi enclosure, direct measuring scales.

Cost‑effectiveness

The C5126 is priced significantly below comparable European or Japanese vertical lathes of similar capacity, yet its specification – hydrostatic table, NN‑series bearings, 40Cr gears, 16‑speed gearbox, and rigid cast iron structure – matches or exceeds many mid‑range offerings. For shops currently handling large flanges, bearing rings, or gear blanks on undersized lathes, the C5126 represents a practical upgrade: more rigidity, more torque, larger capacity, and a price that makes the investment decision straightforward.

➡️ For full specifications, optional configurations, or a budget quotation, click here to contact our sales engineering team.