We turn and mill the same part on one machine. One setup, one datum, tighter concentricity. 127 CNC machines in Dongguan, 16 of them mill-turn centers, holding ±0.005 mm on metal and plastic parts up to 4,000 mm.
Most failures on these parts trace back to one of four things.
Move a shaft from the turning center to the mill and the second setup adds its own runout. Bore and OD drift apart. A 0.02 mm eccentricity turns into a rejected assembly, and the fix usually costs more than the part.
Cheap initial numbers often hide extra setups, soft jaws, custom fixtures, or a second inspection pass. The invoice arrives with line items you never approved. Ask what is included before the chips fly.
A milled flat or cross hole that intersects a turned bore leaves a burr you cannot reach with a deburring tool. It shows up as a leak path or a fatigue crack six months into service. Tool exit direction decides whether this happens.
Tool wear, coolant pressure, and depth of cut all move the surface finish. Without in-process checks, part 1 and part 500 can differ by two Ra steps. That matters on sealing faces and bearing journals.
The answer is usually to stop moving the part.
A mill-turn center keeps the part in one chuck while a live tool does the milling. The datum never changes. Concentricity between a turned OD and a milled bore is set by the machine geometry, not by how carefully an operator re-indicates the second setup.
We run 16 mill-turn centers with up to 5 simultaneous axes and a Ø400 mm rotary table. That covers cross-drilled holes, milled flats, slots, and eccentric features on the same part. For a hydraulic manifold or a motor shaft, this removes the tolerance stack that comes from two separate machines.
Not every part belongs on a mill-turn center. If a feature needs to be ground after hardening, or if the part is a thin-wall aluminum housing that will deflect under chuck pressure, we split the work across a 3-axis mill and a lathe with soft jaws. The sequence is chosen by what the tolerance stack allows, not by machine availability.
For parts that do stay on one machine, we program the milling passes before the finishing turn whenever possible. That way a cross hole or flat does not interrupt the surface finish on a sealing diameter. It also keeps the tool exit burr on a face you can reach later.
| Part feature | Best process | Why |
|---|---|---|
| Shaft with cross holes | Mill-turn center | Concentricity held in one chuck |
| Housing with large face mill | 3-axis mill + lathe | Face area exceeds live tool reach |
| Thin-wall aluminum bore | Lathe, soft jaws | Chuck pressure controlled |
| Hardened bearing journal | Turn, harden, grind | Grinding sets final size |
| Long shaft over 1,000 mm | Mill-turn, bar feed | No re-chuck for straightness |
| Plastic bushing | Lathe, sharp tooling | Low cutting force, no melt |
Six operations that cover most turned-and-milled part families.
Shafts, bushings, fittings, and housings turned to ±0.005 mm. Bar feed up to Ø80 mm, chuck work to Ø400 mm. Live tooling for cross holes and flats.
Prismatic parts, plates, and brackets. Travels of 750 × 1,150 × 550 mm. Good for parts with one dominant face and no undercut features.
Parts that need features on four sides without re-fixturing. 12 machines available. Cuts setup count and holds angular position between faces.
16 simultaneous 5-axis centers for contoured surfaces, impellers, and complex geometry. Reduces the number of fixtures and the tolerance stack they add.
Turning and milling in one spindle. Best for parts where a turned diameter and a milled feature share a tolerance. Ø400 mm rotary table.
Anodizing, plating, powder coating, bead blasting, and polishing. Laser marking available from 1.5 mm character height.
| Item | Range | Notes |
|---|---|---|
| Maximum part size | 4,000 mm | Long shafts on mill-turn centers |
| Large travel | 4,000 × 400 × 150 mm | Long, narrow parts |
| Medium travel | 750 × 1,150 × 550 mm | Plates and housings |
| Compact travel | 500 × 500 × 450 mm | Small prismatic parts |
| Tolerance | ±0.005 mm | ±0.0002 in on qualified features |
| Surface finish | Ra 0.2–3.2 μm | Fine to as-machined |
| Minimum order | 1 part | Prototype to 10,000+ runs |
| Quote turnaround | 12 hours | Includes free DFM analysis |
15 years turning and milling production parts. 3 wholly-owned plants, 7,600 m² of floor space, 150 technicians.
Not just a first-article number. In-process monitoring keeps the same tolerance on part 1 and part 5,000. Reports available on request.
Send the drawing and get a quote plus free DFM analysis within 12 hours. Production can start within 24 hours of approval.
ISO 9001:2015, IATF 16949:2016, ISO 13485:2016, and ISO 27001:2022. Covers automotive, medical device, and data security requirements.
Aluminum 6061, 7075, and 2024. Stainless 303, 304, 316L, and 17-4PH. Steel 1018, 4140, and 4340. Titanium, Inconel, brass, copper, and engineering plastics.
One prototype or 10,000 parts. Same process control either way. Uploads stay confidential and an NDA is available on request.
Motor shafts and transmission components. IATF 16949:2016 process control, ±0.005 mm on bearing journals, in-process checks on every run.
Surgical instrument bodies and implant housings. ISO 13485:2016, Ra 0.2–0.8 μm on sealing faces, full material traceability on request.
Actuator housings and structural fittings. Titanium and 17-4PH turned and milled in one setup, first article inspection on request.
Joint housings and gearbox components. Mill-turn centers hold bore-to-OD concentricity, so gear mesh and bearing fit stay within spec.
When a milled feature and a turned diameter share a tight tolerance. Cross holes relative to a bore, a flat relative to an OD, or an eccentric feature on a shaft all benefit from one setup.
If the part has no such relationship and the features are simple, separate machines are usually faster and cheaper.
Up to 4,000 mm maximum processing size. Long narrow parts run on the 4,000 × 400 × 150 mm travel machines. Larger prismatic parts go on the 750 × 1,150 × 550 mm or 600 × 600 × 600 mm mills.
If a part exceeds these envelopes, we will tell you at quote time rather than after the order.
We choose the tool exit direction so the burr lands on an accessible face, then deburr by hand or with a controlled tool path. This is planned at programming, not fixed at inspection.
For hydraulic and pneumatic parts, we can add a bore scope check or a flow test if the drawing calls for it.
Aluminum 6061-T6 and 7075, stainless 303 and 316L, and steel 1018 and 4140. Titanium TC4 (Ti-6Al-4V) and 17-4PH are common for aerospace and medical parts.
Engineering plastics such as POM, PEEK, and PC run on the lathes with sharp tooling and controlled feed to avoid melting.
Turned and milled surfaces range from Ra 0.2–0.8 μm on fine finishes to Ra 1.6–3.2 μm as-machined. The achievable value depends on material, feature geometry, and whether the surface is turned or milled.
Sealing faces and bearing journals usually specify Ra 0.8–1.6 μm. We can confirm what a specific feature can hold during DFM review.
Yes. 100% inspection before shipment, with raw material checks, in-process monitoring, and a final inspection pass. Inspection reports are available on request.
First article inspection is available on request for orders over 50 units or 5,000 USD.
Quotation and free DFM analysis within 12 hours. Production can start within 24 hours of approval. Parts typically ship in 3–5 days.
Lead time depends on material availability and feature complexity. We give a specific window at quote time.
Yes, but a drawing helps. STEP files define geometry; they do not define datum callouts, surface finish requirements, or which dimensions are critical.
If you send only a model, we will flag the tolerances we plan to hold and ask you to confirm before cutting metal.
Upload a STEP file or PDF drawing. We reply with a quote, a DFM analysis, and a realistic lead time. No minimum order.
12-hour quoteFree DFM analysis100% inspectionNo MOQNDA on request
Trusted by engineers and manufacturers worldwide
Upload your 3D model or 2D drawing and get a quotation with a free DFM analysis. Maximum processing size 4,000 mm.
CNC Metals 13 grades
CNC Plastics 10 grades
Machines & processes 12 options
Surface & post-processing 10 options
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