Large workpieces. Controlled geometry.
Large-Part CNC Machining Services
6CNC provides large CNC machining services for oversized plates, frames, housings, shafts, tooling, and industrial components that require planned lifting, rigid workholding, stable datums, and documented inspection.
Large-format CNC milling and turning
Fixture and setup planning
Inspection reports available
10+ Years
CNC machining experience
140+ Machines
Flexible process capacity
1–600 pcs
Prototype and low-volume focus
Global Delivery
International project support
Size magnifies every process variable
Oversized Part Machining Requires More Than a Bigger Machine
As a workpiece becomes larger or heavier, handling, support, fixture stiffness, thermal growth, residual stress, tool reach, chip removal, and inspection access become central to the manufacturing plan. A nominally simple plate or frame can become difficult when flatness, parallelism, hole position, and multi-face relationships must be maintained across a long span.
6CNC reviews the full process before quotation: raw stock or near-net blank, lifting and loading, machine travel, table load, datum strategy, roughing and stress relief, setup count, finishing sequence, measurement range, surface treatment, packaging, and transport.
Machine capacity is confirmed from the actual CAD model and drawing rather than from one generic maximum-size claim.
Large components and applications
What We Manufacture
We machine custom, drawing-controlled parts for industrial equipment, automation, energy, transportation, aerospace support systems, molds, and specialised machinery.
01
Machine Bases and Plates
Base plates, tooling plates, mounting tables, and structural panels with controlled flatness, hole location, and datum relationships.
02
Frames and Weldments
Machined frames and fabricated structures requiring datum cleanup, aligned bores, mounting faces, and post-weld dimensional control.
03
Large Housings
Gearbox, motor, pump, bearing, and equipment housings with bores, sealing faces, pockets, ports, and multi-side features.
04
Shafts, Rollers, and Cylinders
Large rotational parts requiring diameter control, concentricity, runout, shoulders, threads, keyways, or ground bearing seats.
05
Molds, Dies, and Tooling
Large mold plates, fixtures, nests, tooling bodies, and production aids with pockets, cooling passages, and locating features.
06
Energy and Heavy-Equipment Parts
Flanges, hubs, brackets, manifolds, adapters, covers, and replacement components for demanding industrial service.
Process selection
Large CNC Machining Capabilities
The best route depends on the workpiece envelope, weight, geometry, material, tolerance relationships, quantity, and inspection scope. Multiple processes may be coordinated for one oversized component.
Large-Format CNC Milling ›
For plates, frames, bases, housings, pockets, surfaces, hole patterns, and long-span features.
Large CNC Turning ›
For shafts, rollers, cylinders, hubs, flanges, and other heavy rotational parts.
Boring, Drilling, and Threading
For aligned bores, deep or intersecting holes, large threads, ports, and precision hole patterns.
Multi-Axis Machining ›
For compound angles and multi-face features where fewer setups protect positional accuracy.
Precision Grinding ›
For selected flat, cylindrical, hardened, or fit-critical surfaces requiring controlled geometry and finish.
Finishing and Secondary Work ›
Heat treatment, stress relief, anodizing, plating, painting, passivation, marking, and coordinated assembly.
Engineering reference
Capacity, Materials, Tolerances, and Inspection
Large component machining should be quoted against the complete manufacturing route. A machine envelope alone does not guarantee that a part can be safely held, cut, measured, finished, packed, or transported.
| Project Requirement | What 6CNC Reviews | How It Is Confirmed |
|---|---|---|
| Part envelope | Stock size, finished size, tool clearance, fixture space, and axis travel | CAD and setup feasibility review |
| Workpiece weight | Table load, lifting points, crane or forklift access, and safe support | Blank weight and handling plan |
| Materials | Aluminum, carbon and alloy steel, stainless steel, cast iron, copper alloys, titanium, and engineering plastics | Grade, condition, certification, and stock availability |
| Dimensional tolerance | Feature length, material removal, thermal growth, stiffness, and tool reach | Feature-level process review |
| Geometric control | Flatness, parallelism, perpendicularity, position, concentricity, and runout | Datum strategy and inspection plan |
| Inspection range | Instrument access, CMM or alternative measurement range, and required uncertainty | Agreed reporting and measurement method |
| Finishing and logistics | Masking, distortion risk, lifting protection, packaging, and freight limitations | Supplier and transport coordination |
Send the finished CAD model, dimensioned drawing, material, blank form, estimated weight, quantity, finish, and delivery location so we can confirm the realistic machining envelope and process route.
Risk reduction
How 6CNC Protects Accuracy on Large Parts
Stable Datum and Setup Plan
Functional datums are established early so roughing, repositioning, and finishing do not create uncontrolled tolerance stacking.
Rigid Workholding and Support
Fixture contact, clamping force, overhang, support spacing, and lifting access are planned around part stiffness and weight.
Stress and Distortion Control
Stock condition, weld stress, roughing allowance, staged machining, stress relief, and finish sequence are reviewed before production.
Thermal Awareness
Large workpieces can expand measurably with temperature. Machining and inspection conditions are considered for critical dimensions.
In-Process Verification
Datums and critical features can be checked between operations so errors are found before additional high-value machine time is committed.
Protected Handling and Shipping
Lifting points, edge protection, corrosion prevention, fixture removal, packing, and transport orientation are planned for delivery.
Inside 6CNC
Machining Capacity for Complex Components
6CNC combines CNC milling, turning, multi-axis machining, grinding, inspection, finishing, and international project coordination from our Shenzhen manufacturing base.
Supplier fit
Is 6CNC Right for Your Large Component?
Our large component machining service is best suited to custom, drawing-controlled parts where process planning, flexible capacity, inspection, and coordinated secondary work matter.
- Oversized prototypes and low-volume custom components
- Large plates, frames, housings, shafts, rollers, and tooling
- Projects requiring several machining or finishing processes
- Parts with defined datums, critical features, or GD&T
- Metal and engineering-plastic components
- International projects requiring protected packing and delivery
Extremely heavy, exceptionally long, or mass-production projects are reviewed individually. If the required envelope, handling, or economics do not fit our available route, we will identify that during the feasibility review.
Quote workflow
From CAD Model to Delivered Part
Send Complete Files
Provide CAD, a controlled drawing, material, blank form, estimated weight, quantity, finish, inspection needs, and destination.
Capacity and DFM Review
We assess machine travel, table load, lifting, tooling, workholding, stress, setups, metrology, and logistics.
Quotation and Process Plan
You receive pricing, lead time, process assumptions, inspection scope, and any open technical questions.
Machining and Verification
Production follows the agreed revision with staged machining and in-process checks where appropriate.
Finishing, Packing, and Delivery
Secondary processes, final inspection, protected packing, and international freight are coordinated.
Request a Large-Part CNC Machining Quote
Send your model and drawing with the finished dimensions, raw-stock size, estimated weight, material, quantity, critical tolerances, finish, inspection requirements, and delivery destination. Our engineers will confirm the manufacturing route before quotation.
Buyer questions
Large-Part CNC Machining FAQ
What is large-part CNC machining?
Large-part CNC machining uses computer-controlled milling, turning, boring, drilling, grinding, and related processes to manufacture workpieces whose envelope, weight, handling, or inspection needs exceed those of conventional parts.
What size parts can 6CNC machine?
Maximum size depends on the process, geometry, weight, fixture space, tool clearance, table load, measurement method, and secondary operations. Send the CAD model, drawing, blank size, and weight so 6CNC can confirm the project-specific envelope.
Which materials are suitable for oversized part machining?
6CNC evaluates aluminum, carbon and alloy steels, stainless steel, cast iron, copper alloys, titanium, and engineering plastics. Material condition, stock form, internal stress, and availability are considered during quotation.
How are tolerances maintained across a large component?
Accuracy depends on datum planning, rigid support, controlled clamping, roughing and finishing sequence, stress management, thermal conditions, tool reach, in-process checks, and an inspection method suitable for the complete feature span.
Can 6CNC machine large welded structures?
Selected weldments can be reviewed for post-weld machining. The drawing should identify weld condition, heat treatment or stress relief, reference datums, machining allowance, critical faces, and alignment requirements.
Do you provide finishing and worldwide delivery?
Yes. 6CNC can coordinate selected heat treatment, anodizing, plating, painting, passivation, grinding, marking, inspection documentation, protected packaging, and international transport according to the quoted scope.
What information is needed for an accurate quote?
Provide a 3D model and dimensioned drawing plus material grade, raw-stock form and size, estimated weight, quantity, tolerances, GD&T, finish, inspection reporting, packaging requirements, and delivery address.