Sinker EDM (also known as Die-Sinking or Ram EDM) is a precision machining process that uses a custom-shaped electrode to create complex cavities and internal features in electrically conductive materials. It is especially effective for deep cavities, sharp internal corners, and complex 3D geometries that cannot be achieved by CNC milling.

At EadeTech, Sinker EDM supports aerospace, medical, and industrial tooling projects involving titanium alloys, nickel superalloys, tantalum, and hardened steels.

When Sinker EDM Is the Best Solution

Sinker EDM is ideal when:

• Internal geometry is inaccessible to cutting tools

• Sharp internal corners are required

• Material hardness exceeds practical milling limits

• Deep cavities must maintain accuracy

Sinker EDM Machining Capabilities

• Maximum cavity depth: 300 mm

• Minimum internal corner radius: 0.03 mm

• Dimensional tolerance: ±0.005 mm

• Surface finish: Ra 0.6 – 1.8 μm

• Electrode materials: Copper, graphite, copper-tungsten

Table 1: Sinker EDM Capability Overview

Materials Suitable for Sinker EDM

Table 2: Sinker EDM-Compatible Materials

Electrode Design & Process Control

Electrode design is critical to Sinker EDM success. EadeTech engineers optimize:

• Electrode material selection

• Wear compensation

• Multi-stage sinking strategies

This ensures dimensional stability even in deep or complex cavities.

Table 3: Electrode Material Selection

Typical Sinker EDM Applications

• Aerospace mold and die inserts

• Cooling channel cavities

• Turbine component features

• Medical device molds

• Precision industrial dies

Table 4: Application Examples

Quality Inspection for Sinker EDM Parts

All Sinker EDM components undergo strict inspection:

• CMM dimensional verification

• Depth and profile measurement

• Surface roughness testing

• Electrode wear documentation

Table 5: Inspection Criteria

Why Choose EadeTech for Sinker EDM

• Strong expertise in hard and refractory materials

• Reliable deep-cavity machining

• Tight tolerance control

• Seamless integration with CNC machining and finishing

Discover more at https://www.eadetech.com.