EDM Machining Services for Complex Precision Features
Factory-direct EDM machining for hard metals, deep cavities, sharp internal corners, mold inserts and complex precision features that are difficult to machine with conventional CNC cutting tools.
Sinker EDM Support
Blind cavities, mold inserts and electrode-shaped internal geometry.
Hard Metal Machining
Conductive hardened steel, tool steel and difficult metals reviewed.
Sharp Internal Features
Smaller internal radii than conventional milling in suitable geometries.
No Cutting Force
Useful for delicate features, hard materials and difficult-to-reach areas.
Inspection Reports
Dimensional inspection and reports available based on requirements.
Is EDM right for my part? | EDM is suitable when the material is hard, geometry is difficult to reach with cutting tools, or sharp internal corners and deep cavities are required. |
Can EDM machine hardened steel? | Yes. EDM can machine conductive hard metals, including hardened steel and tool steels, after heat treatment when required. |
Can EDM create sharp internal corners? | EDM can produce much smaller internal radii than conventional milling because it does not rely on rotating cutting tools. |
Can you machine deep cavities? | Sinker EDM can be reviewed for deep cavities, ribs, slots and complex internal features using custom electrodes. |
Is EDM suitable for all materials? | No. EDM only works on electrically conductive materials. Non-conductive plastics and ceramics usually require other processes. |
Can you inspect EDM features? | Dimensional inspection, surface checks, electrode-related feature verification and inspection reports are available based on requirements. |
Turning Capability
EDM Machining Capability
Before quoting, our engineers review material conductivity, hardness, cavity depth, internal corner requirements, electrode planning, surface finish and inspection needs to determine whether EDM is the right process.
| Capability Area | Manufacturing Range | Best For |
|---|---|---|
| Sinker EDM | Electrical discharge machining with shaped electrodes. | Deep cavities, mold inserts, ribs, blind pockets and internal features. |
| Hard Metal EDM | EDM for conductive hard metals and heat-treated materials. | Hardened steel, tool steel, stainless steel and difficult-to-machine alloys. |
| Sharp Internal Features | Smaller internal radii than conventional milling in suitable geometries. | Sharp corners, narrow slots, small cavities and complex mold details. |
| Deep Cavity EDM | Custom electrodes used to form deep or narrow cavities. | Mold cavities, die inserts, tooling parts and internal profiles. |
| EDM Finishing Support | Surface condition reviewed based on function, finishing passes and post-processing needs. | Functional surfaces, mold components, inserts and precision tooling. |
| Inspection Support | Dimensional inspection and report support based on drawing requirements. | Critical cavities, slots, profiles, depths and electrode-shaped features. |
Process Fit
When to Choose EDM Machining
EDM machining is often selected when conventional CNC milling, turning or drilling cannot efficiently produce the required geometry. Because EDM removes material through electrical discharge instead of cutting force, it can machine hard conductive materials, deep cavities, narrow slots and sharp internal features.
Simple flat surfaces may be more cost-effective with CNC milling service. Round parts may be better suited for CNC turning service. Through profiles and plate-like parts may be better suited for wire EDM service.
Choose EDM when
The part has hard conductive material, deep blind cavities, narrow slots or sharp internal corners.
Choose milling when
The part mainly has accessible flat surfaces, pockets, holes or standard 3-axis features.
Choose wire EDM when
The feature is a through-profile, tight contour, punch, die or plate-like component.
Ask for DFM review when
You are unsure whether CNC roughing, sinker EDM, wire EDM or a combined process is most practical.
Process Comparison
Sinker EDM vs Wire EDM
Sinker EDM and wire EDM solve different manufacturing problems. Our engineers review your CAD model and drawing to recommend the appropriate EDM process.
01
Sinker EDM
02
Wire EDM
03
EDM Drilling
Part Types
EDM Machined Parts We Support
Baosheng supports EDM machining for tooling, mold components, hard metal features and precision parts where sharp internal geometry, deep cavities or hard conductive materials make conventional machining difficult.
- Mold inserts
- Die inserts
- Tooling components
- Deep cavity parts
- Hardened steel components
- Precision slots
- Sharp internal corner features
- Complex internal profiles
- Medical tooling components
- Aerospace-style tooling parts
- Connector mold components
- Injection mold components
- Die casting mold components
- Electrode-shaped cavities
- Small precision cavities
- Hard metal fixtures
Materials & Finishes
Materials and Post-Processing for EDM Parts
EDM works on electrically conductive materials. It is often used for hard metals, heat-treated steels, tool steels and difficult-to-machine alloys where conventional cutting tools may be inefficient or unable to reach the required geometry.
EDM produces a characteristic spark-eroded surface. Functional surfaces may require finishing passes, polishing, cleaning, passivation or surface treatment depending on the application.
Tool Steel
Mold inserts, die components and hardened tooling parts.
Hardened Steel
Precision cavities, tooling features and wear-resistant parts.
Stainless Steel CNC Machining
Complex conductive parts and corrosion-resistant tooling features.
Copper CNC Machining
Electrodes, conductive components and EDM support parts.
Titanium CNC Machining
Difficult-to-machine conductive precision parts.
Passivation
Corrosion resistance for stainless steel EDM parts.
Electropolishing
Smoother surfaces for selected stainless steel EDM features.
Cleaning & Deburring
EDM residue removal and preparation for assembly or finishing.
Not sure whether EDM is required?
Upload your CAD files and our engineers will review material, hardness, cavity depth, internal corners, electrode planning and inspection needs before quoting.
Quality Control
Tolerance, Electrode Planning and Inspection
EDM machining quality depends on electrode design, discharge parameters, material condition, feature depth, surface finish requirements and inspection strategy. Baosheng reviews CAD models and 2D drawings to identify critical features and suitable inspection methods before production.
CAD Review
Material, cavity, slots and EDM features identified.
EDM Feasibility
Conductivity, depth and internal corner needs reviewed.
Electrode Planning
Electrode shape, wear allowance and finishing passes reviewed.
Process Sequence
CNC roughing and EDM finishing sequence planned.
In-Process QC
Critical depths, slots and profiles checked as needed.
Final Inspection
CMM, gauges, depth or optical checks based on drawing.
Report
Dimensional report available upon request.
Application Proof
EDM Machining Case Studies
The cases below focus on realistic EDM applications: hardened materials, deep cavities, narrow ribs, sharp internal features, electrode planning and inspection.
| Project | Material / Process | Challenge | Inspection / Result |
|---|---|---|---|
| Hardened Steel Mold Insert with Deep Cavity | Hardened tool steel · sinker EDM + polishing · 24 pcs | Deep cavity and sharp internal corner requirements after heat treatment. | Custom electrodes machined the cavity geometry; cavity depth, profile and insert fit were checked before shipment. |
| Precision Die Insert with Narrow Ribs | Tool steel · sinker EDM · 40 pcs | Narrow ribs and internal details were difficult to machine with conventional milling. | Electrode design balanced rib detail, wear allowance and surface condition; rib width and cavity depth were inspected. |
| Stainless Steel Component with Sharp Internal Features | 316 stainless steel · CNC roughing + EDM + passivation · 80 pcs | Internal corner radius requirement was smaller than practical CNC milling tool radius. | EDM was used after CNC rough machining; internal feature dimensions and surface condition were checked before passivation. |
| Copper Electrode for Mold Cavity Machining | Copper · CNC milling + electrode finishing · 12 pcs | Electrode geometry needed to match cavity detail while accounting for EDM wear. | Electrode profile and critical details were checked before use, supporting stable EDM cavity machining and lower rework risk. |
Project Workflow
How to Order EDM Machined Parts
1.Upload CAD
Send 3D CAD and 2D drawings with cavity and tolerance notes.
2.EDM Review
Material, conductivity, depth, corners and features reviewed.
3.Process Plan
Sinker EDM, wire EDM, CNC roughing or combined process selected.
4.Quote
Receive pricing, lead time and engineering notes.
5.EDM & QC
Parts are machined and inspected based on drawing requirements.
6.Delivery
Parts are finished, packed and shipped for your schedule.
Industries
EDM Machining for Precision Manufacturing Applications
Mold & Tooling
Mold inserts, die inserts, cavities, ribs, internal features and electrode-shaped details.
Medical Devices
Tooling components, stainless steel features and small precision cavities.
Electronics
Connector mold components, small cavity details and precision inserts.
DFM Guidance
Design Tips for EDM Machined Parts
For EDM machined parts, manufacturability depends on material conductivity, cavity depth, electrode access, internal corner requirements, surface finish and inspection references. A 2D drawing is strongly recommended for depths, tolerances and surface finish notes.
- Confirm the material is electrically conductive.
- Review deep cavities for electrode design and flushing.
- Specify which internal corners truly require sharp EDM features.
- Define functional and cosmetic EDM surface requirements separately.
- Allow engineering review for electrode wear compensation.
- Consider CNC rough machining before EDM finishing when possible.
For broader pricing factors, review CNC machining cost.
Your questions answered
Swiss Machining FAQs
When should I choose EDM machining?
EDM machining is recommended when your part has hard conductive material, deep cavities, sharp internal corners, narrow slots or features that are difficult to reach with conventional CNC cutting tools.
What is the difference between sinker EDM and wire EDM?
Sinker EDM uses a shaped electrode to machine blind cavities and internal features. Wire EDM uses a moving wire to cut through conductive material and is best for profiles, slots and precision contours.
Can EDM machine hardened steel?
Yes. EDM can machine conductive hardened materials, including tool steel and hardened steel, when the geometry and project requirements fit the process.
Can EDM create sharp internal corners?
EDM can create smaller internal radii than conventional milling because it does not rely on rotating cutting tools. Final corner capability depends on electrode design and feature requirements.
Can EDM machine non-conductive materials?
No. EDM requires electrically conductive materials. Non-conductive plastics and ceramics usually require other manufacturing processes.
Is EDM slower than CNC milling?
EDM can be slower than conventional cutting for simple geometry, but it is valuable for hard materials, deep cavities, sharp internal corners and features that are not practical with milling tools.
Do EDM parts need post-processing?
Some EDM parts may require polishing, cleaning, deburring, passivation or additional surface treatment depending on functional and cosmetic requirements.
Can you combine CNC machining and EDM?
Yes. Many parts are rough machined by CNC milling first and then finished with EDM for deep cavities, sharp corners or difficult internal features.
What files do you need for an EDM quote?
We recommend 3D CAD files and 2D drawings with material, cavity depth, tolerance, surface finish, electrode-related features and inspection requirements.
Can you sign an NDA before reviewing EDM files?
Yes. NDA can be arranged before file review when your project requires confidentiality.
Get a Quote for EDM Machined Parts
Upload CAD files and drawings with material, cavity depth, feature geometry, tolerance, surface finish and inspection requirements. Our engineers will review EDM feasibility, electrode planning, machining sequence and inspection needs before quoting.
- NDA available before file review
- EDM process and electrode planning review
- CNC roughing + EDM finishing support
- Dimensional inspection reports available
- Multiple CAD and drawing files supported
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