China 5 axis CNC machining service

A 3-axis mill moves the tool in X, Y and Z while the part stays fixed. A 5-axis machine adds two rotary axes, so the tool can approach the work from almost any direction without the operator unclamping it. The word simultaneous matters here. On a 3+2 machine the table indexes to an angle, locks, then cuts. On a true 5-axis center all five axes move together along the toolpath, which is what makes curved surfaces and undercuts machinable in one pass.

One setup is the real payoff. Every time a part is unclamped and re-fixtured, you add stack-up error and hands-on time. A 3-axis process for a five-sided housing might need four setups and four datums. The same part on a 5-axis center is typically held once in a self-centering vise or a custom fixture, and every face is cut before it comes out. That is where the tolerance budget stays available for the feature that actually matters.

Surface finish also changes. When a ball nose cutter stays normal to the surface, the stepover marks stay even and the scallop height drops. You can often machine a contoured face to Ra 0.8–1.6 μm straight off the tool and skip a hand polish step. For molds, impellers and curved brackets, that is the difference between a part that fits and a part that needs rework.

The clearest case is geometry that cannot be reached from three orthogonal directions. Impeller blades, turbine housings, angled ports, deep ribs on a curved shell, and any part with features on five sides. If your drawing has a callout that says do not reposition, or a GD&T frame tied to a single datum, 5-axis is usually the cheaper route in total, even if the hourly rate is higher.

The second case is tolerance stack. If the current process needs three or four datums to hold ±0.005 mm, you are fighting the setup, not the machine. Consolidating to one setup removes a whole layer of variation. That is often worth more than the cycle time you save.

It is not always the right answer. A flat plate with holes and pockets cuts faster on a 3-axis mill with a lower burden rate. A shaft with turned features and a few milled flats belongs on a mill-turn center, not a 5-axis trunnion. And if the part is small and simple, forcing it onto a 5-axis machine just adds setup and programming time. We will tell you when 3-axis or 4-axis is the better fit. That is part of the DFM review, not an upsell.

It starts with the file. STEP or IGES, plus a 2D drawing with tolerances and datums. Our engineers run a DFM check and send a quotation with free DFM analysis within 12 hours. If a wall is too thin for the tool, or a corner radius needs a smaller cutter than the depth allows, we flag it before you commit to a design. Production can start within 24 hours of a released order.

Programming comes next. We build the toolpath in CAM, verify it against the stock model, and simulate the rotary moves to check for collisions before anything touches metal. For contoured work we choose the cutter and stepover based on the target finish, not just the fastest path. A ball nose at a tight stepover costs cycle time, so we only go there when the drawing calls for it.

On the floor, the part is set up once. We use a Ø400 mm rotary table for compact work and larger trunnions for medium parts. Our 5-axis centers cover travels of 750 × 1,150 × 550 mm, 600 × 600 × 600 mm, down to 500 × 500 × 450 mm and 500 × 310 × 200 mm. For long parts we run a 5-axis gantry with 4,000 × 400 × 150 mm travel and a 4,000 mm maximum processing size.

Materials are not a problem. Aluminum 6061, 7075 and 6082; stainless 303, 304, 316L and 17-4PH; steels 1018, 1045, 4140 and 4340; titanium TC4; Inconel; magnesium AZ31B and AZ91D; plus POM, PEEK and carbon fibre. Tool strategy changes with the material. Titanium and Inconel need lower surface speed and more attention to heat. Aluminum rewards high spindle speed and a free-cutting geometry.

The general tolerance for 5-axis work is ±0.005 mm (±0.0002 in) on critical features. That is not a blanket number for every dimension on every part. It applies to features that are machined in the final setup and measured on a CMM. If a feature is cut in a separate operation, the stack-up changes and the number changes with it. We will tell you which dimensions can hold that band and which cannot.

Finish depends on the toolpath. As-machined surfaces land around Ra 1.6–3.2 μm. A controlled finishing pass gets you Ra 0.8–1.6 μm. For optical or sealing faces we can push to Ra 0.2–0.8 μm, usually with a finer stepover and a dedicated finish cutter. If a surface needs both a tight radius and a mirror finish, that is a conversation worth having early.

Every part goes through raw material check, in-process monitoring and a final inspection before shipment. We inspect 100% of parts, and we send inspection reports on request. Our historical qualification rate is 99.99%. If your drawing needs first article inspection or a full dimensional report, say so on the RFQ so we can quote the inspection time, not just the machining time.

The shop holds ISO 9001:2015, IATF 16949:2016, ISO 13485:2016 and ISO 27001:2022. Those cover general quality, automotive, medical devices and information security. Your files are treated as confidential, and we can sign an NDA before you upload. No minimum order quantity applies, so a single prototype and a 10,000-part run both go through the same process.