Erodex is a UK-based leader in sinker EDM (Electrical Discharge Machining) solutions, supporting manufacturers across aerospace, automotive, tool and die, and medical sectors. Whether you’re machining deep cavities, sharp internal corners, or complex mould shapes, our precision electrodes, consumables, and fixturing are engineered for high-accuracy sinker EDM results.
With over 50 years of experience in EDM and spark erosion, we support manufacturers with products that optimise performance, reduce cycle times, and improve accuracy in the most demanding sinker EDM applications.
What is Sinker EDM?
Sinker EDM, also known as die-sinking or cavity-type EDM, is a machining process that erodes material from a workpiece with a custom-shaped electrode and controlled electrical discharges. Unlike wire EDM, which cuts through material, sinker EDM is ideal for machining moulds, dies, internal cavities, and precision slots in hardened materials.
The electrode (typically made of graphite or copper) is shaped to match the required geometry and gradually “sinks” into the material through spark erosion, achieving extremely accurate shapes and surface finishes.
Benefits of Sinker EDM
- No contact machining: Eliminates tool pressure and deformation
- Works on hard metals: Ideal for titanium, tool steels, and carbide
- Creates complex cavities: Perfect for deep or blind holes and undercuts
- Sharp internal corners: Achieves detail unachievable with conventional tools
- Excellent surface finish: Reduces or eliminates post-machining finishing
- Repeatable and precise: Essential for die, mould, and high-volume applications
Sinker EDM Products from Erodex
Graphite Electrodes
- Available in a range of grades for roughing and finishing
- CNC-machined or supplied as blanks
- Excellent machinability and wear resistance
- Stable performance even under high temperatures
Copper Electrodes
- High conductivity for fine detail and finishing work
- Suitable for intricate moulds and medical components
- Supplied in standard forms or custom-machined to order
Carbon Fibre Composite Fixtures (CFC)
- Ideal for maintaining electrode stability during long cycles
- Withstands extreme temperatures and electrical loads
- Customisable to your application and part geometry
Dielectric Fluids & EDM Consumables
- High-quality fluids to ensure clean, consistent spark erosion
- Filters, deionising resin, and machine maintenance materials
- Available with fast UK delivery
Sinker EDM Applications
Tool & Die Manufacturing
- Mould cavity creation for plastic injection and casting
- High-accuracy stamping dies with repeatable geometries
Aerospace & Defence
- Internal cavities in turbine parts and high-strength alloys
- Precision slotting and edge radius control in complex components
Medical Devices
- EDM machining of titanium and stainless-steel implants
- Clean surface finishes ideal for surgical-grade components
Automotive
- Production of moulds, valve components, and high-performance parts
- Essential for machining hardened transmission and injection system parts
Why Erodex for Sinker EDM?
Erodex is a trusted supplier of sinker EDM products and spark erosion materials for some of the world’s leading manufacturers. From supplying custom electrodes to helping improve EDM setup efficiency, we offer:
- Over 50 years of EDM experience
- UK’s largest stock of graphite and copper electrodes
- Custom-machined and ready-to-use electrode solutions
- Expert technical support for EDM setups and fixtures
- Rapid delivery across the UK and the Middle East
Whether you’re producing one-off tools or batch components, our precision sinker EDM products help you achieve better results with less rework.
Contact Erodex Today for Sinker EDM Solutions
Looking to upgrade your sinker EDM processes with better electrodes, fixtures, and consumables? Get in touch with the EDM experts at Erodex today. We’re here to help you achieve consistent, high-quality machining results across any application.