VT machining provides CNC Swiss Machining Spring Steel for customers who need accurate, repeatable Spring Steel components. Because Spring Steel is high yield strength and elastic recovery, we adapt the process to suit — controlling the variables that matter for this alloy.
Starting Parameters for CNC Swiss Machining Spring Steel
| Cutting speed (carbide) | 100-165 m/min |
|---|---|
| Feed | 0.1-0.3 mm/rev |
| Spindle speed, Ø8 mm bar | 3980-6570 rpm |
| Insert / tool class | ISO P — CVD-coated carbide |
| Coolant | Emulsion (6-8%) |
| Length-to-diameter capability | up to ~10:1 (slower feeds for this grade) |
Shown for Spring Steel (65Mn / SK5 / 1075), the most common Spring Steel grade we see for CNC Swiss Machining. Starting values for Spring Steel (65Mn / SK5 / 1075), Annealed or hardened & tempered strip; optimised on the first article.
CNC Swiss Machining Capability for Spring Steel
- Ø1–32 mm bar
- Slenderness without deflection
- Tolerance to ±0.003 mm
- High-volume small parts
Spring Steel material properties, finishing options and grade notes are on our CNC Turning Spring Steel page.
How CNC Swiss Machining Spring Steel Works
The Spring Steel bar or billet rotates in the spindle while single-point tools shape outer diameters, bores, faces, grooves and threads. Constant surface speed control keeps cutting conditions stable from large to small diameters.
Every job begins from your CAD model or 2D drawing. Fixturing and tool paths are planned so the most critical dimensions are produced in the most rigid, repeatable setup. Critical dimensions are checked on the first part and monitored through the run.
Achievable Tolerances for CNC Swiss Machining Spring Steel
| Feature | Standard | Precision |
|---|---|---|
| Outside diameter | ±0.05 mm | ±0.005 mm |
| Bore diameter | H9 | H6 |
| Length / shoulder position | ±0.10 mm | ±0.020 mm |
| Concentricity OD to ID | 0.05 mm TIR | 0.010 mm TIR |
| Roundness | 0.02 mm | 0.005 mm |
| Thread class | 6g / 2A | 4h / 3A |
| Surface finish, as turned | Ra 1.6 µm | Ra 0.4 µm |
Standard is what a normal quotation assumes. Precision is available on nominated features and is priced separately, because it needs extra setups, in-process gauging and CMM verification. Call out only the features that need it — blanket-tightening a drawing is the single most common reason a quote comes back expensive.
CNC Swiss Machining Tolerances & Surface Finish
Turned Spring Steel holds diameter tolerances to about ±0.005 mm with concentricity within 0.01 mm and good roundness. Turned finishes of Ra 0.4–0.8 µm are achievable with finishing passes and sharp tooling.
Final tolerances are governed by the material's behaviour, wall thickness and overall stiffness. We give honest DFM feedback if a callout would be costly or better achieved another way.
Design Tips for CNC Swiss Machining Spring Steel
A few design choices make a real difference to cost and quality. Consistent diameters, standard thread forms and avoiding extremely long, slender features help Spring Steel turned parts stay concentric and economical. If you send your model early, we will return practical DFM feedback before you commit to production.
Applications of CNC Swiss Machining Spring Steel
CNC Swiss Machining of Spring Steel supports parts across aerospace, medical, automotive, electronics, semiconductor, energy and general industrial sectors. We scale from one-off prototypes to ongoing production while holding the same quality.
Typical Spring Steel Parts for CNC Swiss Machining
Illustrative examples of CNC Swiss Machining Spring Steel parts and the callouts that usually drive the process plan. They show the kind of work that fits this process; they are not specific customer orders.
Threaded fitting
- Material
- Spring Steel
- Size
- Ø22 hex × 38 mm
- Key callouts
- G3/8" thread class 4h, bore H8, sealing face Ra 0.8 µm
- Batch
- 2,500 pcs
Run on a sub-spindle lathe so the back face is finished without a second setup.
Connector pin
- Material
- Spring Steel
- Size
- Ø3.0 × 24 mm
- Key callouts
- OD ±0.005 mm, straightness 0.02 mm over length
- Batch
- 20,000 pcs
Swiss-turned from bar with a guide bushing; nothing else holds Ø3 mm over 24 mm.
Valve seat
- Material
- Spring Steel
- Size
- Ø28 × 14 mm
- Key callouts
- Seat angle 45° ±0.1°, roundness 0.005 mm, Ra 0.2 µm
- Batch
- 800 pcs
Seat finished with a single-point diamond pass, no interruption.
No drawing yet? Build one in the browser.
Set the metal, dimensions and features, watch the 3D model update as you type, then switch to the 2D sheet to add dimensions and tolerances. Download it or send it straight to us with your RFQ.
What We Need to Quote CNC Swiss Machining Spring Steel
- GeometrySTEP or IGES for the 3D model, plus a PDF drawing if you have tolerance callouts. A dimensioned sketch is enough to start.
- MaterialThe exact Spring Steel grade and condition — temper, heat-treat state or hardness. If you are not sure, tell us the function and we will suggest one.
- QuantityPrototype count and the expected annual volume. Both change how the part is made and therefore what it costs.
- TolerancesWhich features are critical. Everything else runs to our standard tolerance, which is what keeps the price sensible.
- FinishSurface treatment, cosmetic requirements, and any faces that must be masked.
- DocumentsWhether you need a material certificate, dimensional report, FAIR or PPAP with the shipment.
Missing something from the list is not a problem — send what you have. We will come back with the specific questions rather than a generic form.
Other Metals for CNC Swiss Machining
Other Processes for Spring Steel
Send the drawing, the Spring Steel grade and the quantity. You get pricing, lead time and any DFM notes back — usually within one business day.
Request a QuoteFrequently Asked Questions
Why is Spring Steel a good choice for CNC Swiss Machining?
Spring Steel is high yield strength and elastic recovery, which makes it well suited to CNC Swiss Machining. We tune the process to the alloy so the finished Spring Steel turning part meets your dimensional and functional requirements.
Can VT machining make custom Spring Steel parts to my drawing?
Yes. Spring Steel turning is made to order from your CAD/2D drawing. Share your geometry, material grade, tolerance and quantity and we will confirm feasibility, lead time and pricing.
How clean are the edges produced by CNC Swiss Machining on Spring Steel?
Machined Spring Steel edges are clean and to specification; edge-break or deburring is added when your drawing calls for it.
What tolerances can you hold for CNC Swiss Machining Spring Steel?
Achievable tolerances for Spring Steel turning depend on the alloy, geometry and feature size. Turning holds diameter tolerances to around ±0.005 mm with concentricity within 0.01 mm. Exact figures are confirmed against your drawing callouts.
What is the typical lead time and minimum order for CNC Swiss Machining Spring Steel?
CNC Swiss Machining prototypes for Spring Steel can be produced quickly and scaled to series production. Send your drawing and quantity and we will advise lead time and any minimum order.
What is CNC Swiss Machining Spring Steel and how is it done?
CNC Swiss Machining Spring Steel refers to swiss-type machining guides bar stock through a sliding headstock for high-accuracy small, slender parts. Applied to Spring Steel — high yield strength and elastic recovery — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.