Precision Sinker EDM Service for Complex Cavities and Mold Components
Die Sinker EDM machining for mold inserts, tooling components, hardened steel parts, blind cavities and high-precision OEM applications.
When CNC Machining Cannot Reach the Required Geometry
Sinker EDM is typically selected when parts contain deep cavities, blind features, sharp internal details or hardened materials that are difficult to machine using conventional cutting tools.
Typical Parts Produced by Sinker EDM
Mold Inserts
Plastic mold inserts with deep cavities and detailed geometry.
Stamping Die Components
Punch and die tooling requiring high accuracy.
Blind Cavity Components
Features that cannot be produced using Wire EDM cutting.
Medical Tooling Components
Precision internal cavities and micro features.
Aerospace Components
Complex conductive materials requiring high accuracy.
Custom OEM Precision Parts
Low-volume and production applications.
Sinker EDM vs CNC Milling
| Requirement | Sinker EDM | CNC Milling |
|---|---|---|
| Deep Cavities | Excellent | Limited |
| Sharp Internal Features | Excellent | Limited by tool diameter |
| Hardened Steel | Excellent | Tool wear concerns |
| Blind Features | Excellent | Difficult |
| Material Removal Rate | Slower | Faster |
Sinker EDM does not replace CNC milling service. It complements CNC machining when mold components, hardened materials or blind internal details require electrode-based EDM.
What Is The Difference Between Sinker EDM and Wire EDM?
| Requirement | Sinker EDM | Wire EDM |
|---|---|---|
| Blind Cavities | Yes | No |
| Deep Internal Features | Yes | Limited |
| Through Cutting | No | Excellent |
| Mold Inserts | Excellent | Limited |
| Complex Internal Geometry | Excellent | Moderate |
Materials We Machine
Sinker EDM is suitable for conductive materials, especially hard tool steels and mold materials that require controlled cavity machining.
| Tool Steel | H13, D2, SKD11 |
|---|---|
| Stainless Steel | 304, 316, 17-4PH |
| Carbide | Tungsten Carbide |
| Titanium | Grade 2, Grade 5 |
| Copper | Copper and copper alloys |
| Brass | Precision conductive components |
| All Conductive Metals | Reviewed by material grade, geometry and tolerance requirement |
Sinker EDM Capability
| Process | Sinker EDM, Ram EDM, Plunge EDM |
|---|---|
| Applications | Mold Inserts, Tooling Components, Deep Cavities, Blind Features |
| Materials | Conductive Metals |
| Tolerance | Per Drawing Requirements |
| Production | Prototype, Small Batch, Mass Production |
| Inspection | FAI, CMM, Final Inspection |
Engineering Support Before EDM Production
Drawing Review
We review part geometry, critical dimensions and application requirements before quotation.
Electrode Design Evaluation
Electrode shape, access, wear and manufacturability are reviewed for stable EDM output.
Tolerance Review
Critical features are evaluated against material, cavity depth and inspection method.
DFM Analysis
We provide manufacturing feedback to improve cavity quality, cost and repeatability.
Prototype Support
Prototype and small-batch production can be supported before repeat production.
Manufacturing Route Optimization
Feiyu can combine CNC machining, heat treatment, Sinker EDM, polishing and inspection.
Inspection-Controlled Sinker EDM Manufacturing
Every EDM component can be inspected according to drawing requirements and customer quality standards. Feiyu supports inspection planning through its quality control system.
Sinker EDM Project Examples
Injection Mold Insert
- Material
- H13
- Challenge
- Deep cavity and detailed surface features
- Process
- CNC Machining + Sinker EDM
- Result
- Stable cavity geometry and reduced polishing time
Stamping Die Component
- Material
- D2 Tool Steel
- Challenge
- Complex internal profile after heat treatment
- Process
- Sinker EDM
- Result
- Consistent dimensional accuracy
Medical Tooling Insert
- Material
- Stainless Steel
- Challenge
- Small cavity features
- Process
- Precision Sinker EDM
- Result
- Improved repeatability
Sinker EDM FAQ
Questions are grouped around buyer decisions: confirm the process fit, check material and cavity requirements, then prepare files for quotation and inspection review.
EDM Method Selection
What is Sinker EDM used for?+
Sinker EDM is used for mold inserts, die components, blind cavities, deep internal features, sharp details and hardened conductive materials that are difficult to machine by conventional cutting.
What is the difference between Sinker EDM and Wire EDM?+
Sinker EDM uses a shaped electrode to form blind cavities and internal details. Wire EDM uses a moving wire for through-cut profiles and tight 2D contours.
Can Sinker EDM create blind cavities?+
Yes. Blind cavities are one of the core reasons to choose Die Sinker EDM, Ram EDM or Plunge EDM for mold and tooling components.
Material & Hardness Review
What materials can be machined by Sinker EDM?+
Sinker EDM can machine conductive metals including tool steel, hardened steel, stainless steel, carbide, titanium, copper, brass and other conductive materials reviewed by drawing.
Can Sinker EDM machine hardened steel?+
Yes. Sinker EDM is well suited for hardened tool steel and heat-treated components because the process removes material by electrical discharge rather than cutting force.
How to Start
Do you support prototype production?+
Yes. Feiyu supports prototype, small batch and repeat production after drawing review and EDM route evaluation.
Do you provide inspection reports?+
Yes. First article inspection, CMM inspection and final inspection reports can be provided according to drawing and customer requirements.
What file formats do you accept?+
We commonly accept STEP, STP, DXF, DWG and PDF files for quotation, electrode review and EDM manufacturing planning.
Send Your Sinker EDM Drawings for Review
Upload your CAD files, drawings, material requirements and tolerance specifications. Our engineering team will review your project and recommend the most suitable EDM manufacturing solution.