Parts
5-Axis Parts Made in Vietnam, and Which Motion Each One Really Needs
A part family tells a shop more than an industry name does. An impeller needs 5-axis simultaneous motion whether it goes into a pump or a drone. A manifold is 3+2 indexed work in any industry. This page is organised the way we read your drawing.
Part families and the motion they need
Typical cases, not rules. One feature on a drawing can move a part from 3+2 indexed to 5-axis simultaneous, and we check that feature by feature.
| Part family | Usually | Why | Materials we see |
|---|---|---|---|
| Impellers, fans and compressor wheels | 5-axis simultaneous | Blades twist along their length; the tool has to follow the surface between blades without hitting the next one. | Aluminium 6061 or 7075; stainless and titanium in a smaller pool |
| Manifolds and valve blocks | 3+2 indexed | Ports and cross-drillings at fixed angles on several faces, finished in one or two clampings. | Aluminium, stainless 304 and 316L |
| Housings with angled bores | 3+2 indexed, simultaneous for blended outer faces | Bore axes that are not square to the base hold their relationship best when cut in one clamping. | Aluminium, cast blanks, stainless |
| Mould cores, cavities and inserts | Both | Steep walls and deep ribs reached with a short tilted tool; freeform surfaces finished with simultaneous motion. | Tool steels, pre-hardened and hardened |
| Structural brackets and ribbed parts | 3+2 indexed, simultaneous on sloped walls | Pockets and ribs on several faces, sometimes with tapered walls that are swarf milled. | Aluminium 7075 and 2024, titanium |
| Robot arm links and wrist housings | 3+2 indexed | Bearing bores and mounting faces on several sides, with tight position between them. | Aluminium 6061 and 7075 |
| Instrument bodies and test fixtures | 3+2 indexed, some simultaneous | Compact parts with features on most faces, often in plastics or stainless. | Stainless 316L, PEEK, PEI, titanium |
| Motorcycle and automotive billet parts | Both | Visible sculpted faces cut simultaneously; mounting features indexed. | Aluminium 6061 and 7075 |
Signs a part needs 5-axis simultaneous
- Twisted or blended surfaces. Blades, lofted ports, organic shapes where the surface normal changes along the cut.
- Ruled walls at a varying angle. Tapered ribs and blade walls that are swarf milled with the side of the tool.
- Undercuts. Material hidden from every fixed tool direction.
- Finish on a contoured face. Sealing or visible surfaces where 3-axis step-over marks would need hand polishing.
Signs 3+2 indexed is enough
- Flat faces at angles. Each face is straight, only its orientation changes.
- Angled holes and ports. Each hole has one straight axis, drilled with the spindle aligned to it.
- Features on four or five sides. The gain is fewer clampings, not motion during the cut.
- Deep pockets. A fixed tilt gives a short tool access to the floor.
Design notes that lower the price of a 5-axis part
None of these change the function. Each one removes machine time or a shop's reason to add margin for risk.
Leave room for the holder
Deep features next to tall walls force long tools. A few millimetres of clearance or a slightly larger corner radius lets a shorter tool reach.
Add a clamping feature
A boss or extra stock the shop can hold and cut off later makes one-clamping 3+2 indexed work possible on parts with no flat base.
Mark the critical features
Use a general block such as ISO 2768-m for the rest. Tight limits everywhere force CMM time on features that do not matter.
Specify surfaces honestly
Ra 0.8 µm on a blade needs a fine step-over and long simultaneous cycles. Ra 1.6 or 3.2 µm may be all the function needs.
Send the STEP model
Freeform surfaces cannot be quoted from a PDF alone. The model sets the toolpath; the drawing sets the tolerances.
Say what it connects to
Which faces mate, seal or carry load tells the shop where accuracy goes and where it can save time.
Geometric tolerances are read to ISO 1101 or ASME Y14.5, whichever your drawing states. Background: geometric dimensioning and tolerancing.
Parts that sit outside the usual pool
We would rather say this before matching than after three shops have declined.
- Titanium and nickel alloy parts. In reach, with a small pool of shops. Expect longer quotes and fewer of them.
- Very large parts. Head-head machines for big frames and moulds are less common in Vietnamese job shops than trunnion machines.
- Export-controlled drawings. Tell us before you upload. The data cannot be passed to shops in the normal way.
- Parts that need a sector approval. If your customer requires a specific quality system, we check the shop holds it before its name reaches you.
Related pages
- Processes. Machine layouts and toolpath strategies behind each part family.
- Materials. Grades, designations and how each changes a quote.
- Parts and materials guides. Longer guides by part type.
- How matching works. What we check before your drawing reaches a shop.
Questions about part families
Does my part need 5-axis at all?
Many parts sold as 5-axis jobs are 3+2 indexed work, and some are 3-axis work with a second setup. If the part has only flat faces and straight holes on two sides, a 3-axis shop is usually cheaper. We read the drawing and tell you which, before it goes to any shop.
Which part families fit Vietnamese 5-axis shops best?
Aluminium and stainless housings, manifolds, fixtures, machine parts and mould components land well. Impellers in aluminium are common. Titanium and nickel alloy parts exist but the pool of shops is small, and we say so when your part sits there.
Can you match aerospace or defence parts?
Tell us first if a drawing may be export controlled. Controlled data cannot be shared freely, and it changes which shops can see it and how. Structural brackets and similar parts in aluminium are in reach; flight-critical work needs the approvals your own quality team requires, which we check before matching.
What quantity makes sense?
Prototype to recurring programme. Tell us the real annual volume, because a part made ten a year and a part made ten thousand a year are quoted on different processes and sometimes by different shops.
Have a part in one of these families?
Send the drawing and the STEP model. We tell you whether it needs 5-axis simultaneous or 3+2 indexed and match it to up to 3 shops that make that kind of part. We reply within 24 business hours.