Technical Guide
What Is Sinker EDM?
Understand how sinker EDM forms cavities and complex features with shaped electrodes.
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 helps prepare EDM drawings by reviewing material conductivity, process access, tolerance, surface finish and inspection requirements.
Project question: What Is Sinker EDM?
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 | What Is Sinker EDM? |
|---|---|
| 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.
Technical Note
Use this technical guide to prepare your drawing and key requirements, then contact our team when you need project-specific EDM review.
Need help reviewing an EDM drawing?
Send a drawing question, material details and key requirements for technical review.
Frequently Asked Questions
What is sinker EDM commonly used for?
Sinker EDM is commonly reviewed for blind cavities, ribs, mold details and shaped conductive features.
Why is an electrode needed for sinker EDM?
A shaped electrode forms the cavity geometry, and its material and design affect wear, accuracy and surface finish.
What affects sinker EDM feasibility?
Cavity depth, electrode access, flushing, material condition, tolerance, surface finish and inspection method affect feasibility.
Can sinker EDM be combined with other processes?
Yes. Projects may combine CNC machining, grinding, wire EDM or polishing according to the drawing.
What should be sent for sinker EDM review?
Send drawings, material grade, cavity geometry, tolerance, surface finish, quantity and inspection requirements.