CNC EDM Services for High-Precision Conductive Metal Parts

Clarwe provides CNC EDM services for conductive metal parts that require sharp internal features, tight tolerances, deep cavities, thin ribs, and complex geometries that are difficult to achieve with conventional machining. EDM is especially suitable for hardened metals, intricate tooling components, and delicate features because material is removed through controlled electrical discharges rather than traditional cutting forces.

Our CNC EDM solutions support prototype, bridge, and low-volume production requirements for customers who need precision, repeatability, and engineering-led manufacturing support.

What Is CNC EDM?

Electrical Discharge Machining, or EDM, is a precision manufacturing process used to machine electrically conductive materials through controlled spark erosion. Because EDM does not rely on rotating tools or direct cutting pressure, it is highly effective for hard materials, fine internal details, narrow slots, and part geometries that are difficult to machine conventionally.

CNC EDM is commonly used for tooling, mold inserts, dies, punches, internal keyways, splines, and other components where high dimensional accuracy and difficult feature access are important.

Why Choose CNC EDM?

CNC EDM is often the right process when a part requires sharp internal corners, deep and narrow cavities, intricate profiles, or hardened conductive materials that are challenging for milling or turning. The process is also valuable when reduced cutting force is important for maintaining feature stability in thin or delicate sections.

Choose CNC EDM when your part requires:

Sharp internal corners and fine geometry.
Deep slots, narrow cavities, or thin rib features.
Precision machining in hardened steels or difficult conductive metals.
Tooling features such as mold details, punches, dies, splines, or keyways.
Reduced mechanical stress during machining.

EDM Processes We Support

Wire EDM

Wire EDM uses a continuously fed wire electrode to cut through electrically conductive materials and create highly accurate through-features, narrow slots, profiles, and contour details. It is particularly well suited for precision outlines, tight-tolerance parts, hardened metal inserts, and applications where burr reduction and contour accuracy are important.

Wire EDM is best for:

Through cuts and profile machining.
Narrow slots and fine contouring.
Hardened tool steel inserts and plates.
Precision conductive parts with detailed geometry.

Sinker EDM

Sinker EDM uses a shaped electrode to erode material and form internal features that are not possible with wire EDM alone. It is commonly used for blind cavities, internal recesses, mold details, deep ribs, sharp internal corners, and tooling geometry that requires precise internal form creation.

Sinker EDM is best for:

Blind cavities and recessed internal features.
Mold inserts and die components.
Deep ribs and intricate cavity details.
Internal splines, keyways, and precision tooling forms.

Wire EDM vs. Sinker EDM

Process	How it works	Best for	Typical features
Wire EDM	Uses a thin moving wire electrode to cut through conductive material.	Through-features, profiles, narrow slots, precision contouring.	Profiles, cutouts, slots, sharp outlines, detailed contour geometry.
Sinker EDM	Uses a shaped electrode to create internal geometry by spark erosion.	Blind cavities, recessed forms, internal tooling features.	Mold cavities, die details, internal splines, blind keyways, deep ribs.

Why Choose Clarwe for CNC EDM?

Clarwe supports CNC EDM projects with an engineering-focused approach that helps customers select the right EDM method, review manufacturability, and maintain quality for function-critical parts. We support complex conductive metal components for prototype, bridge, and low-volume production requirements across tooling, industrial, aerospace, medical, and precision engineering applications.

CNC EDM Capabilities

Clarwe supports CNC EDM for precision conductive metal parts requiring controlled geometry, intricate internal detail, and consistent manufacturing quality.

Capability	Clarwe CNC EDM Service
Process types	Wire EDM and Sinker EDM.
Material compatibility	Electrically conductive metals only.
Applications	Tooling, mold inserts, dies, punches, keyways, splines, and precision engineered parts.
Tolerances	Up to ±0.01 mm as standard; tighter tolerances available on select features after review.
Surface finish	Typical Ra 1.6–3.2 µm; finer finishes available on request depending on material and geometry.
Part size range	Suitable for small to medium-sized parts; envelope and fixture limits confirmed during quoting based on geometry and process.
Lead time	Typical lead times from 7–15 business days; expedited options available depending on complexity and production load.
Production volume	Prototype, bridge, and low-volume production.
File formats	STEP, STP, IGES, DXF, DWG, and PDF drawings.
Quality support	Engineering review, dimensional inspection, and documentation support.

Materials for CNC EDM

EDM can only machine electrically conductive materials. Common CNC EDM materials include tool steels, stainless steels, carbon and alloy steels, titanium alloys, copper and copper alloys, tungsten carbide, and selected superalloys where supported.

We machine a range of electrically conductive metals for CNC EDM applications, including materials used for tooling, wear resistance, heat resistance, and precision-engineered components. If your project includes critical hardness, wear, or thermal performance requirements, our engineering team can review the drawing and recommend the most suitable EDM process.

Applications of CNC EDM

CNC EDM is widely used in industries that require feature precision, cavity detail, sharp internal geometry, and reliable performance in hard or difficult-to-machine conductive materials.

Typical applications include:

Injection mold inserts and cavity details.
Dies, punches, and tooling components.
Internal splines, keyways, and intricate form features.
Thin ribs, deep slots, and precision internal corners.
Aerospace, medical, electronics, automotive, and industrial precision parts.

Design Guidelines for CNC EDM Parts

Good design inputs improve manufacturability, quoting speed, and process selection. When preparing a part for EDM, clearly define the geometry, tolerance requirements, and any function-critical surfaces or inspection needs.

Recommended design guidance:

EDM requires electrically conductive materials.
Wire EDM is best for through-features and contour cuts where the wire can pass through the part.
Sinker EDM is more suitable for blind cavities and recessed internal geometry.
Sharp corners, deep cavities, thin ribs, and hardened metals are strong candidates for EDM.
Technical drawings should clearly identify critical dimensions, tolerance zones, and inspection requirements.

Quality Assurance for CNC EDM Projects

Clarwe supports CNC EDM projects with engineering review, dimensional verification, and controlled manufacturing processes for precision-critical components. For customers in aerospace, medical, industrial, and high-performance engineering applications, we support quality-focused workflows that prioritize accuracy, consistency, and clear communication of critical part requirements.

Quality support can include:

Certified quality systems.
Inspection support for critical dimensions.
Repeat-order consistency for production programs.
Documentation support based on project requirements.

How to Order CNC EDM Parts

Upload your 3D CAD model and technical drawing.
Share material, quantity, tolerances, and inspection requirements.
Our team reviews manufacturability and confirms the right EDM process.
Receive your quote and production plan.
Approve the order and move into manufacturing.

Frequently Asked Questions

What is CNC EDM?

CNC EDM is a precision machining process that removes material from electrically conductive workpieces using controlled electrical discharges instead of traditional cutting forces. It is commonly used for intricate features, difficult geometries, and hardened conductive metals.

What is the difference between wire EDM and sinker EDM?

Wire EDM uses a moving wire electrode to create through-features and precision profiles, while sinker EDM uses a shaped electrode to create blind cavities and internal recessed geometry. The correct process depends on the geometry and feature accessibility of the part.

What materials can be machined with EDM?

EDM can machine electrically conductive materials such as tool steels, stainless steels, alloy steels, titanium alloys, copper alloys, tungsten carbide, and selected superalloys.

When should I choose EDM instead of CNC milling?

EDM is often a better choice when a part requires sharp internal corners, deep narrow cavities, delicate ribs, or hardened conductive materials that are difficult to machine using conventional cutting tools.

Can you machine hardened steel with EDM?

Yes. EDM is widely used for hardened steel and other difficult conductive materials, especially in tooling, dies, mold components, and precision engineering parts.

What files do you need for a CNC EDM quote?

A 3D CAD file in STEP, STP, or IGES format is ideal, along with a PDF technical drawing that identifies critical dimensions, tolerances, finishes, and inspection requirements. DXF and DWG files may also support engineering review depending on the part.