Technical Guide
EDM Recast Layer Guide
Review when recast layer, micro-crack risk and surface integrity should be discussed during EDM planning.
EDM Feasibility Notes
We review EDM feasibility for the selected material using the drawing geometry, conductive material condition, tolerance, surface finish, quantity and inspection requirements.
Technical Explanation
This guide explains when recast layer, micro-crack risk, post-processing and surface integrity should be reviewed during EDM planning.
Process Capability Facts
We review EDM process fit from material conductivity, feature access, thickness, geometry, tolerance, surface finish and inspection requirements.
Tolerance, Surface Finish and Geometry Review
Typical tolerance and surface finish depend on material, thickness, feature geometry, flushing, finishing passes and inspection method. Final values must be confirmed from the drawing.
Recast Layer / Surface Integrity Notes
Surface integrity, recast layer, micro-crack risk, post-processing and inspection depend on the material, EDM process, geometry and machine setup.
Technical Review Checklist
| Concept | EDM Recast Layer Guide |
|---|---|
| How we use this guide | We use these points to discuss EDM process fit before confirming the production approach. |
| Drawing review | We confirm material conductivity, feature access, geometry, thickness, tolerance, surface finish and inspection method from your drawing. |
| Project details | Please include drawings, material grade, critical dimensions and any required inspection or surface-integrity controls. |
Inspection and Capability Reference
Inspection planning may include dimensional measurement, optical measurement, surface roughness checks and report requirements according to the drawing.
Need help reviewing an EDM drawing?
Send a drawing question, material details and key requirements for technical review.
Frequently Asked Questions
When should we choose wire EDM instead of sinker EDM?
Wire EDM is usually reviewed for through profiles, slots, cutouts and contours where the wire can pass through the workpiece.
When is sinker EDM better than wire EDM?
Sinker EDM is usually reviewed for blind cavities, ribs, mold details and shaped features that need an electrode rather than a through-wire path.
Can both EDM processes be used on the same part?
Yes. Some projects use wire EDM for profiles and sinker EDM for cavities or detailed features when the drawing requires both access types.
Which process is better for blind cavities?
Blind cavities are normally reviewed for sinker EDM because the electrode can form cavity geometry without requiring a through cut.
Which process is better for through profiles and slots?
Through profiles, slots and cutouts are commonly reviewed for wire EDM when start holes, wire path and part thickness are suitable.