Large CNC Turning
Core Advantages
Machining for Heavy Rotational Workpieces
Individual capacity limits are 800 mm diameter, 1,500 mm length and 500 kg workpiece weight. Heavy hubs and roller bodies are machined as single workpieces, with the support arrangement selected for the part's combined size and mass.
Related Faces and Bores
Large turning is combined with end-face milling, boring, drilling and tapping. On a housing with an axial bore and a mounting flange, the coordinated machining route holds the face and bore to the same drawing references, preserving their specified orientation through successive operations.
Finished Mating Surfaces
Secondary finishing reaches Ra 0.8 µm on designated surfaces. On a large metal-to-metal seating face, refining the surface reduces pronounced machining ridges across the contact area, while rougher finishes remain available for external surfaces that do not form a mating interface.
Specifications and Parameters
|
Parameter Item |
Technical Index |
|
Maximum Processing Diameter |
φ800mm |
|
Maximum Processing Length |
1500mm |
|
Maximum Processing Weight |
500kg |
|
Dimensional Tolerance |
±0.02mm - ±0.1mm (adjusted according to part size) |
|
Surface Roughness |
Ra 1.6μm - Ra 12.5μm (can be processed to Ra 0.8μm subsequently) |
|
Processable Materials |
Carbon steel Q235/Q345, alloy steel 40Cr/42CrMo, stainless steel 304/316, cast iron HT200/HT250, etc. |
|
Surface Treatment |
Hot-dip galvanizing, plastic spraying, blackening, phosphating, painting, chrome plating, etc. |
|
Processing Technology |
Large CNC turning, end face milling, drilling, tapping, boring, knurling, etc. |
Customization
Custom Large Turned Components
Production is based on the component drawing, stock form and available clamping surfaces. The machining route establishes support and access before cutting, then sequences roughing, end-face work and final machining around the features that locate the component in its assembly.
Customizable Items
• Hub, roller, flange or housing geometry
• Bore diameter and stepped-bore profile
• Flange thickness and axial shoulder locations
• Bolt-circle layout and tapped-hole pattern
• Carbon steel, alloy steel, stainless steel or cast iron grade
• Galvanized, black-oxide, phosphated, painted or plated finish
• External grooves and end-face details
Quality Control
- Incoming workpieces are checked for material identity, dimensions, hardness and visible surface condition. The first machining stage establishes the reference surfaces used to check later operations, so measurements remain tied to the same locating scheme throughout the job.
- Bore sizes, axial distances and hole locations are inspected after the operations that produce them. Process checks address dimensional drift and setup movement before final stock is removed; acceptance uses the drawing limits assigned to each feature, not a single tolerance applied to the entire workpiece.
- Every completed part receives final inspection before dispatch. Openings are checked for chips and residue, finished surfaces for damage, and the inspection record against the released drawing; third-party inspection is accepted before shipment.
FAQ
Q: How are large turned components packaged?
A: Shafts use wooden supports and steel straps; flanges and housings use wooden crates.
Q: What are the payment terms for custom large parts?
A: Custom orders use a 50% advance payment and a 50% balance payment.
Q: What locates two mating flanges concentrically?
A: Use the specified pilot or register fit.
Q: How should precision fits be specified on a painted component?
A: Identify surfaces to remain unpainted and state their required final dimensions.
