CNC Wire EDM Spring Steel is a core capability at VT machining. We combine controlled EDM machining with material-aware setup for Spring Steel — an alloy that is high yield strength and elastic recovery — to produce parts that meet your specification first time.
Process Data for CNC Wire EDM Spring Steel
| Area cutting rate (0.25 mm brass wire) | ~145 mm²/min |
|---|---|
| Linear speed at 10 mm thick | ~14.5 mm/min |
| Linear speed at 30 mm thick | ~4.8 mm/min |
| Linear speed at 60 mm thick | ~2.4 mm/min |
| Achievable accuracy | ±0.005 mm with 3-4 skim passes; Ra 0.4-0.8 µm |
Shown for Spring Steel (65Mn / SK5 / 1075), the most common Spring Steel grade we see for CNC Wire EDM. Typical values for Spring Steel (65Mn / SK5 / 1075), Annealed or hardened & tempered strip; confirmed on the first part.
CNC Wire EDM Capability for Spring Steel
- Kerf from 0.1 mm
- Tolerance to ±0.002 mm
- Hardened & exotic alloys
- Sharp internal corners
Spring Steel Material Data
| Density | 7.85 g/cm³ |
|---|---|
| Tensile strength | 1200–1700 MPa |
| Yield strength (0.2%) | 1000–1500 MPa |
| Hardness | 44–50 HRC (tempered) |
| Melting point | 1425 °C |
| Thermal conductivity | 46 W/m·K |
| Thermal expansion | 11.4 ×10⁻⁶/K |
| Electrical conductivity | 8% |
| Machinability (C36000 = 100%) | 40% (annealed); grind or EDM when hardened |
| Grades we run | 1074, 1095, 65Mn, 60Si2Mn, 301 spring temper, 17-7PH |
Published typical values for 1095 / 65Mn. Other grades in the family differ — the certificate supplied with your order carries the actual heat-lot figures.
Springback. Formed features are over-bent by a calculated amount; on flat springs we etch or wire-EDM instead of punching so the temper is untouched.
How CNC Wire EDM Spring Steel Works
Material is removed from the Spring Steel workpiece by controlled electrical discharges across a dielectric gap, with no mechanical contact. Flushing, on/off pulse timing and electrode/wire feed are set to balance speed against surface finish.
Programming is driven directly by your 3D model or print. Work-holding, tool selection and the cutting strategy are planned around the critical features and the material before the first chip is cut. First-off inspection confirms the process is centred before production continues.
Achievable Tolerances for CNC Wire EDM Spring Steel
| Feature | Standard | Precision |
|---|---|---|
| Profile dimension | ±0.010 mm | ±0.002 mm |
| Internal corner radius | 0.15 mm | 0.05 mm |
| Taper control over 50 mm | 0.02 mm | 0.005 mm |
| Surface finish (skim passes) | Ra 0.8 µm | Ra 0.2 µm |
| Recast layer | 10 µm | 2 µm (fine skim) |
| Start-hole diameter | 1.0 mm | 0.25 mm |
| Workpiece hardness | no limit (conductive) | no limit (conductive) |
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.
Design Tips for CNC Wire EDM Spring Steel
We are happy to suggest design tweaks that improve manufacturability. EDM suits sharp internal corners, thin ribs and hardened Spring Steel that cannot be milled; allowing a small corner radius where possible speeds the cut. If you send your model early, we will return practical DFM feedback before you commit to production.
CNC Wire EDM Tolerances & Surface Finish
EDM holds tolerances to roughly ±0.002–0.005 mm with no cutting force on the Spring Steel part, producing fine, controlled surface textures and sharp internal corners impossible to mill.
Exact achievable figures depend on the alloy, the feature size and the part geometry. Tell us which dimensions are critical and we will advise feasibility up front.
Working with Spring Steel
As a material, Spring Steel is high yield strength and elastic recovery. Our setup reflects the alloy's machinability so the finished part is accurate and free of avoidable defects.
We verify the exact grade and condition before machining, and traceable mill certs are available on request. We can work to your nominated material source or specification when required.
Applications of CNC Wire EDM Spring Steel
Customers order CNC Wire EDM Spring Steel components for everything from instrumentation to structural and functional assemblies. Whether you need a single prototype or recurring production volume, the same process discipline applies.
Typical Spring Steel Parts for CNC Wire EDM
Illustrative examples of CNC Wire EDM 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.
Spline broach section
- Material
- Spring Steel
- Size
- Ø28 × 40 mm
- Key callouts
- Involute profile ±0.005 mm, Ra 0.4 µm
- Batch
- 60 pcs
Wire EDM after hardening to 62 HRC — the profile would not survive being cut soft and heat-treated.
Injection mould cavity rib
- Material
- Spring Steel
- Size
- 0.25 mm wide × 8 mm deep
- Key callouts
- Width ±0.005 mm, VDI 21 finish
- Batch
- 45 pcs
Sinker EDM with a graphite electrode; a cutter that thin would break in the first pass.
Turbine blade fir-tree root
- Material
- Spring Steel
- Size
- 40 × 25 mm section
- Key callouts
- Profile ±0.008 mm
- Batch
- 120 pcs
Held on a dedicated fixture so every blade in the set indexes identically.
Finishing Options for Spring Steel
| Finish | Thickness / effect | Why it gets specified |
|---|---|---|
| Deburr / edge break | 0.05–0.3 mm | All parts unless the drawing says otherwise |
| Bead blast | Ra 1.6–3.2 µm | Uniform matt finish, hides tool marks |
| Laser marking | — | Part number, lot code, data matrix |
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 Wire EDM 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 Wire EDM
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 Wire EDM?
Spring Steel is high yield strength and elastic recovery, which makes it well suited to CNC Wire EDM. We tune the process to the alloy so the finished Spring Steel EDM machining part meets your dimensional and functional requirements.
How clean are the edges produced by CNC Wire EDM 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 is CNC Wire EDM Spring Steel and how is it done?
CNC Wire EDM Spring Steel refers to wire EDM cuts conductive metal with a charged wire, achieving fine detail and tight tolerance with no cutting force. 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.
What surface finish is achievable on Spring Steel with CNC Wire EDM?
Surface finish on Spring Steel is controlled to your specification; we confirm the achievable Ra against your callout.
Which industries use CNC Wire EDM Spring Steel parts?
CNC Wire EDM Spring Steel parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise Spring Steel components are required.