Technical Reference
EDM Machining Process Guide Technical Reference
EDM process selection starts with feature access: through profile, blind form, small or deep hole, or miniature feature. The process guide fails when one process is assigned to the whole part instead of to each feature.
Quick Answer
EDM process selection starts with feature access: through profile, blind form, small or deep hole, or miniature feature.
Concept Summary
What It Is
EDM machining is a family of non-contact processes that remove conductive material with controlled electrical discharges. Wire EDM makes through profiles, Sinker EDM makes blind forms, Small Hole EDM makes deep small holes, and Micro EDM makes miniature features.
What It Can Do
Route through profiles to Wire EDM, blind cavities to Sinker EDM, difficult holes to Small Hole EDM, and miniature details to Micro EDM; one part may use several routes. When planning Machining Process, apply the requirement only to the dimensions and faces that control fit, function, service life, or documented release.
What It Cannot Do
The process guide fails when one process is assigned to the whole part instead of to each feature. Through profiles, blind cavities, deep small holes, and sub-millimeter details often require different EDM routes or a hybrid CNC-plus-EDM sequence.
How It Works
Electrical discharges remove conductive material without a cutting edge. The useful engineering decision is how electrode access, material condition, gap control, debris removal, finishing, and inspection interact on the named feature. This mechanism explains the limits and behavior that matter when planning Machining Process.
EDM Machining Process Guide Reference
| What you're asking | What you can expect |
|---|---|
| Feature | Start with |
| Through profile or slot | Wire EDM |
| Blind cavity or rib | Sinker EDM |
| Small, deep, or angled hole | Small Hole EDM |
| Micro hole, slot, or cavity | Micro EDM |
| Open accessible geometry | CNC or another conventional route |
Surface and Edge Effects
Assign surface, edge, and sub-surface requirements only where they affect function, and give each requirement its own acceptance method. For Machining Process, tie the accepted condition to the feature and inspection method named in the drawing.
Machining Process Drawing and Release Checkpoints
- Identify the controlled feature, material condition, access direction, and functional datum for this Machining Process decision.
- Separate dimensional requirements from texture, edge, recast, corrosion, fatigue, or post-process acceptance.
- State the inspection method, sampling or first-article requirement, drawing revision, quantity, and any documentation needed for release.
Limits and Better Alternatives
Main Limit
For EDM Machining Process Guide, the guide applies to the named technical decision and does not replace the drawing-specific review of geometry, material, setup, and inspection. When that boundary dominates, use CNC, grinding, laser, waterjet, or a hybrid route for features that do not need EDM hardness, access, or edge-quality advantages.
Consider Another Route When
Use CNC, grinding, laser, waterjet, or a hybrid route for features that do not need EDM hardness, access, or edge-quality advantages.
Practical Next Step
Assign surface, edge, and sub-surface requirements only where they affect function, and give each requirement its own acceptance method. Route through profiles to Wire EDM, blind cavities to Sinker EDM, difficult holes to Small Hole EDM, and miniature details to Micro EDM; one part may use several routes.
What to Remember
EDM process selection starts with feature access: through profile, blind form, small or deep hole, or miniature feature. Use the process only where its physical access and feature limits fit the drawing, then release the result against a named inspection method.
Technical Reference
Use the values as planning references and define the functional requirement on the controlled drawing.
Use This Guide to Prepare Your RFQ
Contact us when your drawing and requirements are ready for review.
- Drawing or part sketch
- Material grade
- Thickness / part size
- Quantity
STEP/STP, DXF, DWG, PDF, IGS/IGES or ZIP.
Confidential drawing review. NDA support available on request.
Frequently Asked Questions
Can one part use several EDM processes?
Yes. Route each feature independently.
What is the first selection question?
Determine whether the feature is through, blind, a hole, or miniature.
Does conductivity select the process?
Conductivity makes EDM possible; feature access selects the route.
When should conventional machining be used?
Use it for open geometry where speed and cost matter more than EDM access or edge quality.