EDM Service
Wire EDM Machining
Wire EDM cuts conductive material with a continuously moving wire electrode and no mechanical cutting force. It is strongest on through features that need sharp internal corners, burr-free edges, or stable dimensions in hardened material.
Quick Answer
Choose Wire EDM when the wire can pass completely through the workpiece from an edge or a start hole. Blind cavities and closed pockets are not wire-cut features.
Key Process Decisions
When to Choose This Process
Typical planning tolerance is ±0.005–0.025 mm, with Ra 0.2–3.2 μm as the broad finish context.
What to Watch For
The wire needs a continuous path. Tall sections also need controlled flushing, guide alignment, wire tension, and trim-pass planning. We manage this by checking access, support, discharge conditions, and inspection before release.
How the Process Works
Wire EDM feeds a continuously renewed brass or coated wire through deionized water while pulsed sparks remove a through profile. Water is used because its conductivity can be controlled and it cools long cuts efficiently; the moving wire also presents a fresh electrode surface, so wear does not accumulate in one shaped tool. The trade-off is geometric: wire tension, guide alignment, flushing, section height, and trim-pass offset determine kerf, taper, verticality, and the smallest practical internal radius, and the wire still needs a continuous entry-to-exit path.
Wire EDM Capability Reference
| What you're asking | What you can expect |
|---|---|
| Feature types | through profiles, precision slots, punches, inserts, cutouts, narrow webs, and tapered walls |
| Tolerance | ±0.005–0.025 mm |
| Surface finish | Ra 0.2–3.2 μm |
| Wire diameter | 0.10–0.30 mm planning range |
| Minimum internal corner | Approximately wire radius plus spark gap |
| Main limitation | Blind cavities and closed pockets are not wire-cut features. |
Surface Control
A rough cut is commonly planned around Ra 2.0–3.2 μm. One or more lower-energy trim passes can move selected functional faces toward Ra 0.4–1.6 μm or finer planning ranges.
Wire EDM Drawing Checkpoints
- Choose Wire EDM when the wire can pass completely through the workpiece from an edge or a start hole.
- State the material grade, condition, controlled dimensions, and the functional surfaces that need Ra 0.2–3.2 μm.
- Use the same datum scheme for machining and inspection, and identify any report or sample-approval requirement.
Typical Parts and Features
- punches and die inserts
- precision profile gauges
- gear and spline outlines
- fixture plates
- connector and terminal profiles
- narrow slots
Limits and Better Alternatives
Consider Another Route When
Use Sinker EDM for blind forms, CNC for accessible open geometry, or laser/waterjet when sheet-cutting speed matters more than EDM edge quality.
Practical Next Step
For a Wire EDM quote, send the drawing, material grade and condition, critical dimensions, surface requirements, quantity, and inspection expectations. If the process route is unclear, send what you have and we will map each feature to the appropriate EDM method.
Practical Takeaway
Wire EDM is the first route to review for a through profile that needs sharp corners, tight control, and no burrs.
Request a Machining Feasibility Review
Send material grade, drawing files, tolerance and quantity. We confirm process fit before quoting.
- Drawing or part sketch
- Material grade
- Thickness / part size
- Quantity
- Tolerance and critical dimensions
- Surface finish or inspection requirement
STEP/STP, DXF, DWG, PDF, IGS/IGES or ZIP.
Confidential drawing review. NDA support available on request.
Frequently Asked Questions
When should I choose Wire EDM?
Choose Wire EDM when the wire can pass completely through the workpiece from an edge or a start hole. It is strongest on through features that need sharp internal corners, burr-free edges, or stable dimensions in hardened material.
What usually limits Wire EDM?
Blind cavities and closed pockets are not wire-cut features. The wire needs a continuous path. Tall sections also need controlled flushing, guide alignment, wire tension, and trim-pass planning.
What tolerance and finish can I plan for?
Use ±0.005–0.025 mm and Ra 0.2–3.2 μm as planning ranges. Geometry, material condition, finishing passes, and inspection determine the released result.
What should I send for review?
Send the drawing, material and condition, functional dimensions, surface callouts, quantity, and inspection requirements. If some items are unknown, send the available files and we will help define the missing points.