01
The second batch drifts out of tolerance
A first article passes at ±0.005 mm, then batch three arrives at ±0.02 mm. Assembly jigs no longer close. You scrap the run, requalify the supplier, and lose four to six weeks of program time.
Automotive CNC Machining
Auto Parts Milling Turning Machining CNC Services
We machine production and prototype parts on 127 CNC machines in Dongguan, to ±0.005 mm. Send a drawing and we come back with a quote and a DFM report inside 12 hours. One bracket or ten thousand.
IATF 16949:2016±0.005 mm16 five-axis centers12-hour quoteNo MOQNDA on request
127High-precision CNC machines
±0.005 mmAchievable tolerance
15 yearsIn precision machining
99.99%Qualification rate
Where auto programs stall
Four problems we are asked to fix
Most of these show up after you have already paid for one wrong run. Here is what they cost.
02
Turning and milling split across two vendors
One shop turns the hub, another mills the flange. The bore and the bolt pattern are measured in different setups, so concentricity errors only appear at assembly. Rework freight and inspection both land on your desk.
03
Surface finish fails the print callout
A sealing face is specified at Ra 0.8–1.6 μm and arrives at Ra 3.2 μm. The seal weeps in the durability test. You now pay for re-machining, a new test cell slot, and a revised PPAP.
04
Prototype shop cannot scale to production
The shop that cut five good prototypes quotes 12 weeks and a new tooling charge for 5,000 pieces. You need one supplier who holds the same process, fixtures and inspection plan from first article to volume.
How we run the job
Milling and turning under one roof, one setup plan
Two capabilities do most of the work on automotive parts. Both live in the same plant.
Turned parts
Turning for shafts, hubs and fittings
Most rotating parts arrive as bar stock and leave as a finished geometry. We run 16 mill-turn centers and a Ø400 mm rotary table, so a shaft with cross-drilled holes and a milled flat comes off one machine without a second fixture. Every turning process starts from a process sheet that fixes the datum and the inspection points before the first chip.
On a typical hub or sensor boss, live tooling lets us drill off-axis ports in the same cycle as the OD and bore. One chucking means the bore-to-OD concentricity is set by the machine, not by how carefully someone re-indicates the part. That is the difference between a part that seals and a part that weeps.
- 1Bar feed and chuckingØ3 mm to Ø400 mm turning envelope with live tooling for cross features.
- 2One-setup concentricityBore, OD and bolt pattern referenced to the same datum in a single cycle.
- 3Finish controlSealing faces held at Ra 0.8–1.6 μm, fine bores to Ra 0.2–0.8 μm.
Milled parts
Milling for housings, brackets and covers
Prismatic parts need access to several faces and they need it without moving the part. We run 16 simultaneous 5-axis machining centers, 12 four-axis mills and 27 three-axis machines. Thin-wall brackets, sensor housings and mounting plates are cut with the toolpath planned around the clamping, so the part does not spring when it comes out of the vise.
Where a casting needs finished bores and a flat gasket face, we machine the aluminum casting directly. One program produces the flatness, the bore position and the mounting hole pattern, so the gasket face and the bores agree with each other at assembly.
- 1Five-face access5-axis positioning cuts multiple faces without re-fixturing the part.
- 2Thin-wall controlToolpaths sequenced to limit distortion on walls down to 0.8 mm.
- 3Casting to finished partAluminum and magnesium castings machined complete in one program.
Process selection
Which process to quote for a given part
Use this to decide what to ask for. It is not a rulebook, it is where most automotive parts land.
| Part type | Typical process | Why |
|---|---|---|
| Shaft, pin, bushing, fitting | CNC turning, live tooling | Rotational geometry, tight concentricity |
| Hub with bolt circle | Turn + mill in one setup | Bore and hole pattern share a datum |
| Housing, cover, bracket | 3-axis or 4-axis milling | Flat faces, pocket and hole work |
| Complex housing, 5 faces open | 5-axis milling | Fewer fixtures, one datum chain |
| Thin-wall shroud, 1 mm wall | 5-axis with sequenced toolpath | Controls distortion and chatter |
| Casting needing finished bores | Milling from casting | Flatness and bore come from one program |
What we run
Six services used on automotive programs
A production part usually touches two or three of these before it ships.
01
CNC Milling & Turning
3-axis, 4-axis and 5-axis milling plus live-tool turning. Parts up to 4,000 mm in the largest travel, down to micro features on small housings. One process sheet covers the whole part.
02
Rapid Prototyping
Machined prototypes from the same stock and the same datum as production. Fit checks and mule-vehicle builds run before tooling is committed. Design changes feed back into the production program.
03
Part Surface Finishing
Anodizing in clear, color, hardcoat and conductive, plus plating, powder coating, black oxide, blasting and polishing. Sealing and bearing surfaces are masked where the finish would change the fit.
04
Sheet Metal Fabrication
Brackets, heat shields and mounting plates that sit next to the machined parts. Laser cutting, forming and hardware insertion, so a sub-assembly arrives from one supplier with one inspection plan.
05
Metal Die Casting
Aluminum and magnesium castings for housings and covers where a solid billet would waste cycle time. We machine the casting complete, including bores, gasket faces and mounting holes.
06
Custom 3D Printing
SLA and SLS parts for form and fit checks, jig and fixture prototypes, and underhood mock-ups. Useful when the geometry is not final and a machined prototype would be wasted money.
Shop capability
What our machines and inspection cover
Numbers from our own equipment list and quality plan.
| Item | Capability |
|---|---|
| Machine count | 127 high-precision CNC machines |
| 5-axis centers | 16 simultaneous 5-axis machining centers |
| 4-axis / 3-axis | 12 four-axis mills, 27 three-axis machines |
| Mill-turn centers | 16 machines with live tooling |
| Maximum part size | 4,000 mm maximum processing size |
| Largest travels | 4,000 × 400 × 150 mm |
| Tolerance | ±0.005 mm (±0.0002 in) |
| Surface finish | Ra 0.2–0.8 μm to Ra 1.6–3.2 μm |
| Inspection | 100% inspection before shipment |
| Reports | Material, in-process and final reports on request |
Why this shop
Six reasons engineers keep the work here
15Y
Fifteen years in machining
Founded in 2011, three wholly-owned plants and 7,600 m² of floor space. The process knowledge sits with 150 technicians, not with one person who might leave.
±0.005
Tolerance we hold in production
±0.005 mm is a production number, not a one-off demonstration. It is reachable because the datum, fixtures and inspection plan are fixed before the first batch.
99.99%
Qualification rate
Parts are inspected against the drawing before they ship. Raw material check, in-process monitoring and final inspection are documented for every lot.
12 h
Quote and DFM turnaround
A quotation and a free DFM analysis within 12 hours of receiving the drawing. Production can start within 24 hours of approval.
4 certs
Audited quality system
ISO 9001:2015, IATF 16949:2016, ISO 13485:2016 and ISO 27001:2022. The automotive certificate is the one that matters for PPAP work.
No MOQ
One piece to 10,000+
No minimum order quantity. A single prototype and a 10,000-piece run use the same process sheet, so the transition to volume does not restart qualification.
7,600 m²Manufacturing space
150Technicians
3Wholly-owned plants
< 2%Historical late-delivery rate
Part families
What this looks like on real part families
Powertrain and drivetrain components
Hubs, flanges and sensor bosses that must run true at speed.
- ±0.005 mm
- IATF 16949
- Turn + mill one setup
Underhood housings and covers
Sealing faces and bore positions that have to agree with each other.
- Ra 0.8–1.6 μm
- Flatness on gasket face
- 3-axis and 5-axis
EV battery and inverter parts
Cooling plates and busbar mounts with tight wall control.
- Thin-wall control
- Leak-critical faces
- 100% inspection
FAQs
Questions we get from automotive buyers
What tolerance can you actually hold on a production run?
±0.005 mm is the number we quote for production work, and it depends on the feature. A bored bore or a ground face holds it more easily than a long thin wall.
If a print asks for something tighter than the process can repeat, we say so in the DFM report rather than accept the order and hope.
Do you turn and mill the same part, or split it?
We do both in one plant. Parts that need turning and cross-milling go on the 16 mill-turn centers so the bore, OD and bolt pattern come from one setup.
When a part genuinely needs two operations, we plan the datums so the second operation builds on the first instead of re-establishing it by hand.
Which materials do you machine for auto parts?
Aluminum 6061, 6061-T6, 2024, 5052, 5083, 6063, 6082, 7075 and ADC12. Stainless 303, 304, 316, 316L, 420, 430, 431, 440C and 17-4PH.
Steel 1018, 1045, 4130, 4140, 4340 and A36. Copper and brass C101, C103, C110, C27400, C28000 and C36000. Titanium TA1, TA2 and TC4, plus Inconel and magnesium AZ31B and AZ91D.
Can you start from a casting instead of solid bar?
Yes. We machine aluminum and magnesium castings complete, including bores, gasket faces and mounting hole patterns.
For housings and covers this cuts cycle time against cutting the same shape from billet. Send the casting drawing and the finished drawing together and we quote both operations.
What do you need to quote a milling and turning job?
A 3D model or a fully dimensioned 2D drawing, the material and finish, and the quantity. GD&T callouts help, especially on bores and hole patterns.
If you have a target annual volume, include it. It changes whether we recommend a fixture that pays back over 10,000 parts or a simple vise setup.
How fast is a quote, and how fast do parts ship?
Quotation and free DFM analysis come back within 12 hours. Production can start within 24 hours of approval.
Parts ship in 3–5 days for most jobs. On-time delivery is tracked across the plant, and our historical late-delivery probability is below 2%.
Is there a minimum order quantity?
No. We run from one prototype to 10,000+ part runs. There is no minimum order quantity.
Prototype and production parts use the same process sheet, fixtures and inspection plan, so moving from five pieces to five thousand does not restart the qualification work.
How do you handle confidentiality on a new automotive design?
Uploads are secure and confidential. An NDA is available on request before you send any files.
We work under ISO 27001:2022 for information security, which covers how drawings and models are stored and who can access them.
Send the drawing, get the quote back in 12 hours
Upload a 3D model or 2D drawing and we return a price and a free DFM report within 12 hours. No minimum order quantity, 100% inspection before shipment, NDA on request.
12-hour quoteFree DFM analysis100% inspectionNo MOQNDA on request
