Why large‑diameter parts demand a properly sized lathe
For shops machining large flanges, bearing rings, gear blanks, valve bodies, pump casings, wind tower flange sections, and heavy equipment housings, one common productivity barrier is an undersized lathe. Parts that barely fit on a 2,000 mm class machine often require multiple setups, suffer from vibration during heavy cuts, and produce inconsistent finishes. The C5126 addresses these limitations with a 2,600 mm maximum turning diameter, 2,300 mm worktable, 37 kW main motor, and hydrostatic guideway for exceptional stability.
Application 1: Large pipeline flanges and wind tower flange sections
Flanges for oil, gas, water, petrochemical pipelines, and wind towers range from 1,000 mm to over 2,500 mm. The C5126 accommodates flanges up to 2.6 meters, covering most pipeline flange sizes.
A typical cycle on the C5126 for an 800–2,400 mm carbon or stainless steel flange includes face turning of sealing surfaces (often with gasket groove), outer diameter turning, inner diameter boring, chamfering, and deburring. The hydrostatic table provides exceptional vibration damping during face turning of large diameters – even with intermittent cuts or hard spots – producing flat, distortion‑free sealing surfaces and reducing subsequent hand finishing.
Application 2: Bearing rings for wind turbines and large industrial bearings
Bearing rings for wind turbine yaw systems, excavator slewing bearings, and large industrial bearings are typically 1,500–2,500 mm in diameter, demanding high concentricity between diameters and raceways, plus excellent roundness and surface finish.
On the C5126, the hydrostatic table and NN‑series spindle bearings provide the required rotational accuracy. The workpiece is clamped once on the 2,300 mm table, and all diameters are turned relative to the same axis. The ±30° swiveling tool post allows raceway tapers to be machined accurately without special form tools or secondary setups. Field experience indicates roundness can be held within 0.01–0.015 mm on rings up to 2,200 mm, with surface finishes of Ra 3.2–6.3 µm.
Application 3: Gear blanks for heavy machinery
Gear blanks for heavy industrial gearboxes, mining equipment, cement mills, and marine propulsion are often large castings or forgings weighing several tons. The primary requirement is a concentric, dimensionally accurate turned blank for subsequent gear cutting (hobbing, shaping, or grinding).
The 37 kW main motor and 16‑speed gearbox provide torque for heavy roughing cuts. The operator selects lower speeds (e.g., 5–15 r/min) for roughing to remove scale, then higher speeds for finishing. Feed rates are adjustable across 12 steps from 0.8 to 86 mm/min. For complex gear blanks with multiple diameters and shoulders, the combination of vertical tool post (1,600 mm stroke) and optional side tool post allows two‑tool operation without manual changes, significantly reducing cycle time.
Application 4: Valve bodies and pump casings
Large valve bodies for oil/gas pipelines, water treatment, and power plants, as well as industrial pump casings, are often complex castings with multiple flange faces, internal bores, and sealing surfaces. The C5126's vertical orientation and open work area simplify loading of irregular castings. The vertical tool post provides facing and boring capability; the optional side tool post adds additional operations. The 16‑speed gearbox offers a wide range – from 1.2 r/min for heavy roughing to 80 r/min for finishing – allowing optimization for cast iron, carbon steel, stainless steel, or non‑ferrous alloys.
How the hydrostatic guideway improves surface finish
One common challenge when turning large diameters is achieving consistent surface finish across the entire part. Vibration from interrupted cuts, uneven material hardness, or the large rotating mass can cause chatter marks that compromise sealing surfaces or bearing raceways.
The C5126's hydrostatic worktable guideway addresses this directly. The pressurized oil film absorbs cutting‑induced vibrations before they affect the workpiece. The constant oil supply ensures smooth rotation – no stick‑slip, no uneven motion – regardless of workpiece weight or cutting load. For large flanges requiring gasket grooves or sealing surfaces, this translates directly into better sealing performance and lower scrap rates.
Setup efficiency and single‑setup machining
The vertical orientation simplifies loading. Large flanges or bearing rings can be lifted directly onto the worktable using an overhead crane, with centering assisted by gravity. Clamping is straightforward using T‑slot bolts and clamps.
Once clamped, all required turning operations – facing, OD turning, ID boring, taper turning, grooving, chamfering – are completed in a single setup. This eliminates errors that accumulate when parts are moved or repositioned. For a typical 1,800 mm diameter flange weighing 5–8 tons, total machine time on the C5126 is often 25–35% shorter than on a smaller lathe requiring multiple passes or secondary operations.
Cost‑effectiveness for job shops
The C5126 is priced to be accessible for small to medium manufacturers, yet its specification is entirely appropriate for regular production of large‑diameter components. By investing in the C5126, shops can:
Take on larger work that smaller lathes cannot handle
Reduce scrap from vibration‑induced chatter
Complete parts in fewer setups, freeing machine time
Compete for higher‑value large‑diameter turning work
For shops currently outsourcing large flanges or bearing rings because existing lathes are too small, the C5126 offers an immediate payback: bring work in‑house, control quality, shorten lead times, and capture margin previously lost to subcontractors.
Practical preparation for buyers
Before delivery, users should prepare a reinforced concrete foundation (600‑grade cement, at least 20 days of curing), provide a suitable overhead crane (10+ tons recommended), and have hydraulic oil, way lubricant, and basic metrology tools (spirit level, dial indicator) ready. The machine weighs approximately 22 tons.
Support and documentation
Each C5126 comes with a one‑year warranty, on‑site installation and training, and complete documentation (operation manuals, maintenance guides, electrical diagrams, quality certificate). For CNC models (CK5126), Siemens, Fanuc, or GSK systems can be specified.
➡️ To discuss how the C5126 fits your parts – large flanges, bearing rings, gear blanks, valve bodies, or heavy housings – or to request a trial cut or quotation, click here to speak with our application engineering team.