Typical size
Often > 1 m length and > 1 ton weight
CNC-Bearbeitung
Large Part CNC Machining
Dedicated large-format CNC for parts typically over 1 m and 1 ton — aerospace, energy, shipbuilding, and heavy equipment.
Large Part CNC Machining is a professional manufacturing service that uses large-scale, dedicated CNC machine tools to cut workpieces that exceed the size or weight capacity of conventional equipment. Typical parts are longer than 1 meter and heavier than 1 ton, and are widely used in aerospace, energy, shipbuilding, and mining machinery.
What is large-part CNC machining?
Large-part CNC is for work that does not fit a standard vise: frames, spars, hubs, and plates that are often longer than a meter and heavier than a ton. Gantry mills, large HMCs, and big lathes establish datums on the floor, not on a benchtop.
AIHFABS quotes this route when logistics, stress relief, and span accuracy matter as much as the toolpath. If the part is small and tight, use milling, turning, or precision machining instead.
Large-part capabilities
Size, weight, and crane access are reviewed before a rate is promised.
Typical tolerance
Around ±0.025 mm on critical features; large spans project-dependent
Machine examples
Gantry mills, large HMC/VMC, large lathes, universal turn-mill
Handling
Gantry crane / modular transport as required
Lead time
Quoted per project (fixturing and logistics driven)
Large-part materials
Aluminum plate, carbon and alloy steel, stainless, titanium, cast iron, and selected plastics.
Aluminum 6061
CNC mill / turn plate and bar
Aluminum 7075
High-strength aerospace aluminum
Stainless Steel 304
General-purpose stainless stock
Stainless Steel 316
Marine-grade stainless
Carbon Steel 1018 / 1045
Traditional mild and medium carbon steel
Brass C360
Free-machining brass
Copper C110
High-conductivity copper
Titanium Grade 5 (Ti-6Al-4V)
CNC mill titanium billet
Clear Acrylic (PMMA)
Transparent CNC sheet and block
Colored / Frosted Acrylic
Opaque, tinted, and matte PMMA sheet
POM (Delrin / Acetal)
Engineering plastic for CNC
Polycarbonate (PC)
Impact-resistant engineering sheet
Large-part surface finishes
Most faces stay as-machined. Paint, blast, or local polish is applied where the drawing asks.
As machined (large face)
Gantry or HMC texture on structural faces. Cosmetic plates can get a finer pass.
Blast or prime
Bead or grit blast plus primer or paint on frames that leave the shop as assemblies.
Local precision faces
Pads, bores, and datums finished tighter than the rest of the span.
How large-part CNC compares on AIHFABS
Use this page for envelope and mass. Use precision machining for small, documented fits.
| Verfahren | Lieferzeit | Toleranz | Preis |
|---|---|---|---|
| CNC Machining ServicesMetals & plastics | From 1–5 business days depending on complexity and finish | ±0.05 mm standard; tighter on request with drawing callouts | Instant quote · typical prototype from $45 |
| CNC Milling ServicesMetals & plastics | Simple 1–3 days; complex 3–7 days; batch 5–15 days | ±0.01 mm standard; ±0.005 mm high precision | Instant quote · typical prototype from $40 |
| CNC Turning ServicesMetals & plastics | Simple 1–3 days; complex 7–10 days | ±0.01 mm standard; ±0.001–0.002 mm high precision | Instant quote · typical prototype from $35 |
| CNC Routing ServicesPlastics & composites | From 2–4 business days | Medium precision (~±0.025 mm class) | Instant quote · typical panel job from $30 |
| 5-Axis CNC MachiningMetals & plastics | From 3–7 business days depending on complexity | ±0.02–0.05 mm on critical features when specified | Instant quote · typical prototype from $80 |
| Precision Machining ServicesMetals & plastics | From 3–8 business days (complexity dependent) | ±0.005–0.01 mm; Ra 0.4–1.6 μm; CPK ≥ 1.33 | Instant quote · quoted to drawing / inspection grade |
| Large Part CNC MachiningMetals & plastics | Quoted per project (fixturing and logistics driven) | Around ±0.025 mm on critical features; large spans project-dependent | Project quote · fixturing and logistics driven |
| Swiss CNC MachiningMetals & plastics | From 3–7 business days; faster on repeat batches | ±0.005 mm standard; down to ±0.0025 mm when specified | Instant quote · most economical in batch runs |
How we run large-part jobs
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1
Step 1
Part envelope, weight, and material are reviewed against large-travel machine capacity.
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2
Step 2
Heavy-duty fixturing, thermal control, and stress-relief steps stabilize the workpiece.
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3
Step 3
Gantry, HMC/VMC, or large lathe/turn-mill operations establish datums and critical features.
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4
Step 4
Floor CMM, laser tracker, or large 3D scanning verifies spans and hole patterns.
Envelope, weight, and lift points are confirmed before fixturing. Stress relief is scheduled when the stock or the weldment needs it.
Floor CMM, laser tracker, or large-area scan verifies hole patterns and long datums. Tight numbers should sit on local pads, not on a full 2 m face.
Advantages and Trade-offs
Advantages
- BOM consolidation into monolithic machined parts
- Stronger structural integrity without weld/bolt weak points
- Shorter lead time by cutting multi-part assembly loops
- High precision at scale — around ±0.025 mm when specified
Trade-offs
- Lead time follows fixturing and freight, not a 3-day prototype cell.
- Holding ±0.025 mm across a full span is often unrealistic; localize the tight zones.
- Deep cavities on a gantry still cost tool time and risk deflection.
Design guidelines for large CNC
Design for a crane and a long table, not for a 3-axis vise.
| Feature | Recommended practice |
|---|---|
| Cavities | Reduce deep pockets and undercuts that force long tools on a gantry. |
| Span tolerance | About ±0.1 mm/m is more honest on large travels than a blanket ±0.02 mm. |
| Local pads | Put tight holes and faces on machined pads, not on as-welded skin. |
| Lift & ship | Show lift points and packing limits early; they change the quote. |
Other CNC processes
CNC Machining Services
CNC machining removes material from solid stock with computer-controlled mills, lathes, and multi-axis centers.
Prozessdetails
CNC Milling Services
CNC Milling Services use computer numerical control (CNC) mills to cut workpieces with rotating tools according to programmed toolpaths.
Prozessdetails
CNC Turning Services
CNC Turning Services use computer numerical control lathes to remove material while the workpiece rotates at high speed and the cutting tool feeds along a set path.
ProzessdetailsLarge-part CNC FAQ
How big is “large” on this page?
Typical jobs are over 1 m in a major length and can exceed 1 ton. Smaller tight parts should use standard or precision milling.
What tolerance can a gantry hold?
Around ±0.025 mm on local critical features. Long spans are quoted to the drawing and the machine travel.
Do you handle shipping of oversized parts?
Yes — gantry crane, modular packing, and freight are part of the project quote.
Can you machine a welded fabrication?
Yes, after stress relief and a datum strategy. Send the weldment model plus the finish-machine drawing.
Is instant quote enough?
Upload still starts the file. Oversized work is often confirmed manually because fixtures and logistics move the number.
Large Part CNC Machining — engineering review before production
Use these process-specific checks when preparing your model, drawing and quote request. The confirmed quotation and approved drawing define the requirements for your part.
Machining envelope versus usable access
A machine envelope alone does not prove a large part can be completed. Stock, fixtures, tool reach, handling and access to each face also matter. Share the full model, mass estimate and required datum relationships for a project review.
Residual stress, support and transport
Removing substantial stock can release stress and move the part. Thin sections need support during machining and measurement. Specify lifting provisions, finished surfaces to protect and transport restrictions before the manufacturing plan is finalized.
Acceptance checklist
Confirm stock condition, setup sequence, agreed measurement support, flatness or alignment requirements and protective packaging. Establish which dimensions will be inspected on-machine or by a separate method.
Ähnliche 3D-gedruckte oder CNC-Teile benötigt?
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Sofortangebot
Sofortangebote eignen sich für Prototypen, Vorrichtungen, Gehäuse und Kleinserien. Werkstoff, Verfahren, Menge und Lieferzeit stehen zusammen.
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