Typical tolerance
±0.01 mm standard; ±0.001–0.002 mm high precision
CNC機械加工
CNC Turning Services
CNC lathe machining for high-precision rotational parts — the workpiece spins while the tool feeds along a programmed path.
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. Unlike milling (tool rotates, workpiece fixed), the core trait of turning is that the workpiece rotates — ideal for shafts, sleeves, bolts, and other cylindrical parts.
What is CNC turning?
On a CNC lathe the workpiece spins and the tool feeds. That is the opposite of milling, and it is why shafts, bushings, glands, and concentric bores come off a turning cell cleaner and cheaper than they would from a vise.
Mill-turn and dual-spindle machines add flats, cross-holes, and back-working so many parts never leave the lathe. AIHFABS quotes turning when rotation is the main feature of the design.
CNC turning capabilities
Diameter, length, and finish below are planning values. Mirror finishes need a drawing callout.
Spindle speed
Up to 20,000 rpm
Min diameter
About 2.0 mm
Max Z travel
Up to 1000 mm
Surface finish
Mirror finishes down to Ra 0.05 μm
Lead time
Simple 1–3 days; complex 7–10 days
Turning materials
Bar stock in aluminum, stainless, carbon steel, brass, titanium, and shop 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
Turning surface finishes
A sharp insert already leaves a fine OD. Polish or plate is added when the seat or the customer face needs it.
As turned
Light insert marks along the OD. Fine enough for most shafts, spacers, and non-sealing hardware.
Fine / mirror pass
Slow finish pass or polish down toward Ra 0.05 μm on bearing and seal diameters.
Plate or passivate
Zinc, nickel, or passivation on steels; anodize on aluminum after mill-turn features are cut.
How turning compares on AIHFABS
If the part is a shaft with a few flats, start here. If it is a block with a bore, start on milling.
| プロセス | 納期 | 公差 | 料金 |
|---|---|---|---|
| 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 turning jobs
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1
Step 1
Upload CAD — 3D models or 2D drawings (NDA available).
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2
Step 2
DFM review and quote — typically within 12–24 hours.
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3
Step 3
Confirm materials, tolerance grade, and surface finishes.
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4
Step 4
CAM programming, fixturing, trial cuts, then production.
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5
Step 5
Full CMM / optical inspection, reports, and shipping.
Bar size, grip length, and tailstock or sub-spindle support are set from the solid. Concentric datums should be obvious on the drawing.
First-off diameters are checked before a batch run. CMM or optical reports cover the features you mark as critical.
Advantages and Trade-offs
Advantages
- Workpiece rotation delivers excellent concentricity on shafts and sleeves
- Lathe, turn-mill, Swiss-type, and multi-spindle capacity options
- Typical accuracy ±0.01 mm; high precision down to ±0.001–0.002 mm
- Efficient for rotational parts versus complex prismatic milling
Trade-offs
- Non-round envelopes still need milling time, which can erase the lathe advantage.
- Very large, unbalanced blanks may need a mill or a large-part cell instead.
- Deep small bores need special tooling and extra inspection.
Design guidelines for turning
Think in diameters, lengths, and the faces that locate in the assembly.
| Feature | Recommended practice |
|---|---|
| Bearing / seal seats | Give diameter tolerance and Ra on the drawing, not only in the model color. |
| Shoulders | Add fillets on diameter steps when fatigue or stress risers matter. |
| Datums | Mark which faces a mill-turn live tool should treat as primary references. |
| Min diameter | About 2.0 mm on standard lathes; smaller pins belong on Swiss. |
Other CNC processes
CNC Machining Services
CNC machining removes material from solid stock with computer-controlled mills, lathes, and multi-axis centers.
プロセス詳細を見る
CNC Milling Services
CNC Milling Services use computer numerical control (CNC) mills to cut workpieces with rotating tools according to programmed toolpaths.
プロセス詳細を見る
CNC Routing Services
CNC Routing Services use computer numerical control (CNC) routers with high-speed rotating bits to cut, engrave, drill, and shape materials.
プロセス詳細を見るCNC turning FAQ
What tolerance should I plan for turning?
±0.01 mm is a solid planning value. High-precision seats can go to ±0.001–0.002 mm when specified and inspected.
Can you mill flats and cross-holes on the lathe?
Yes on mill-turn cells. Simple OD/ID work stays on a 2-axis lathe to keep the rate down.
What is the smallest diameter?
About 2 mm on standard turning. Below that, or with a high L/D, Swiss is the better page.
Which plastics turn well?
POM, PEEK, nylon, and PTFE are common. Tell us if the part sees steam, chemicals, or food contact.
How fast can a simple shaft ship?
Simple work often leaves in 1–3 business days. Complex mill-turn or special finishes run 7–10 days.
CNC Turning Services — 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.
Slender geometry and concentric features
Long slender parts may need additional support to limit movement during cutting. Show which diameters, shoulders and bores must relate to the same axis. Specify runout or geometric controls on the drawing when assembly depends on them.
Threads, grooves and secondary operations
Define the thread standard, pitch, engagement length and relief. Narrow grooves and deep bores need tool-access review. Cross-holes, flats and angled features may require live tooling or a separate operation, affecting the sequence and datum control.
Acceptance checklist
Confirm stock grade, shaft and bore fits, surface texture on sliding or sealing areas, burr requirements and inspection of concentric relationships after any finishing operation.
同様の3DプリントまたはCNC部品が必要ですか？
AIHFABSはCADアップロードからカスタム3DプリントとCNCの見積を出します。SLA、SLS、MJF、SLM、FDM、DLP、フライス、旋削を比較し、同じ注文でベイパースムージング、染色、陽極酸化、研磨、粉体塗装を追加できます。
インスタント見積
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複数プロセス
材料、プロセス、数量、納期が揃って表示され、仕様変更が新たな問い合わせにならないようにします。
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ファイルアップロード
STL、STEPなど一般的なCADをアップロードしてオンライン見積。
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方案比較
同じ部品で3Dプリント技術とCNCを比較。
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材料と仕上げ
ポリマーまたは金属を選び、必要なら3D Plusハードウェア仕上げを追加。
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注文確認
決済前に価格と納期を確認。特殊仕様は手動見積。
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