Large Parts CNC Machining Service

Precision Machining Beyond Standard Shop Capacity

Large-Format CNC Milling & Turning for Oversized Metal and Plastic Parts
35 Machines Dedicated to Large-Format Work
Maximum Machining Envelope: 4,000 × 2,500 × 1,500 mm (157" × 98" × 59")
Maximum Workpiece Weight: 10,000 kg (22,000 lbs)

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When your component exceeds the capacity of standard CNC machining centers, Jiangzhi provides the equipment, engineering expertise, and large part machining services required for oversized and heavy workpieces. As an experienced large CNC machining supplier, we specialize in machining large parts with reliable dimensional accuracy and consistent quality. Our dedicated large parts machining department operates 35 large-format CNC machines, allowing us to machine large metal and engineering plastic components with reliable dimensional accuracy and consistent quality.

For standard-sized components, please visit our CNC Machining service page. This page focuses specifically on oversized and heavy workpieces that require dedicated large-format equipment.

Large Parts Machining Capabilities

Our CNC capabilities for large parts are designed for oversized metal and engineering plastic components that require extended machining travel, rigid workholding, and heavy-load handling.

Capability	Spec
Maximum part length	4,000 × 2,500 × 1,500 mm (157" × 98" × 59")
Maximum part weight	10,000 kg (22,000 lbs)
Machine count	35 machines
Processes	Milling, Turning, Boring
Tolerance	Up to ±0.05 mm (±0.002")
Materials	Metal, Plastic

Why Large Parts Require a Different CNC Approach

Large parts place different demands on CNC machining than standard-sized components. As part size increases, maintaining accuracy becomes more challenging because the workpiece is heavier, machining distances are longer, and additional setups may be required if the equipment cannot accommodate the entire part. Every extra setup increases the chance of dimensional variation and adds production time.

At Jiangzhi, large components are machined using dedicated large-format CNC equipment designed for oversized workpieces. By combining large-format machining, rigid workholding, and in-house material handling, we reduce unnecessary setups and keep the entire machining process under one roof. This helps customers achieve more consistent accuracy, shorter production cycles, and fewer risks when manufacturing oversized components.

Large Part Machining, Covered End to End

From milling to turning to boring, here's what each process can deliver for your oversized components:

Large Part Milling

Our large-format milling centers support large CNC machined parts up to 4,000 × 2,500 × 1,500 mm, making them suitable for oversized workpieces that exceed the capacity of standard vertical machining centers. Multi-axis milling, face milling, pocketing, contouring, and precision surface machining can all be performed while maintaining consistent dimensional accuracy across large surfaces.

For extremely large components, machining multiple sections and assembling them afterward may improve manufacturability and reduce distortion risk. Whether this approach is appropriate depends on the specific application and engineering requirements.

Large Part Turning

Large-diameter components require rigid spindle support and stable workholding to maintain roundness, concentricity, and surface finish.

Our large turning capability supports components up to 2,000 mm (79") in diameter and 4,000 mm (157") in length, making it suitable for oversized cylindrical components that exceed the capacity of conventional CNC lathes.

Large Part Boring

Large-part boring requires rigid equipment, extended-reach tooling, and accurate alignment to maintain concentricity over deep bores.

Our large-format boring capability supports bore diameters up to 2,000 mm (79") with boring depths up to 1,500 mm (59"), making it suitable for oversized housings, cylinders, gearbox casings, bearing seats, and other precision internal features.

Compared with conventional boring operations, large-format boring typically requires slower cutting parameters and specialized tooling to maintain dimensional accuracy throughout the machining process.

Our Large CNC Machining Workshop

FAQ About Large CNC Machining

What's the largest part Jiangzhi can machine?

We can machine components up to 4,000 × 2,500 × 1,500 mm (157" × 98" × 59") with a maximum workpiece weight of 10,000 kg (22,000 lbs). If your part is larger or has unique machining requirements, send us your drawing for an engineering review.

Does large parts machining cost more than standard CNC machining?

Usually, yes. Large parts require more setup time, heavier fixturing, additional material handling, and longer machining cycles. The final cost depends on the part size, complexity, material, and quantity.

Can a large part be machined in multiple sections and assembled?

Yes, when appropriate. Splitting an oversized component into multiple machined sections can reduce machining difficulty, transportation costs, and the risk of distortion. Our engineers can recommend the best approach based on your design.

How long does large parts machining take compared to standard CNC machining?

Large parts generally take longer to machine because they require more setup, handling, and machining time. Lead time depends on the part size, material, complexity, and production quantity. A production schedule will be provided after reviewing your drawings.

What materials work best for large-format parts?

The most common materials are aluminum, carbon steel, stainless steel, cast iron, and engineering plastics such as POM, Nylon, UHMW, and PTFE. The best choice depends on your application, strength requirements, and operating environment.