What Is Subsoil Erosion?

Sinker EDM is a CNC machining technology that operates using the electrical discharge method and enables the machining of cavities, pockets, and complex internal geometries on metal surfaces by means of an electrode. During the process, the electrode generates controlled sparks without making physical contact with the workpiece.

In summary: Sinker EDM is a high-precision method especially used for machining internal mold details and closed geometries.

How Does Sinker EDM Work?

The sinker EDM process is carried out through the following basic steps:

• The electrode is prepared according to the required geometry
• An electrical discharge is generated between the electrode and the workpiece
• The metal is eroded in a controlled manner by means of sparks
• The process is stably maintained within a dielectric fluid

Thanks to this method, internal cavities and sharp details that cannot be achieved with conventional machining can be produced.

Related content: EDM consumables used in sinker EDM processes are critical in terms of machining quality and electrode life.

For Which Applications Is Sinker EDM Preferred?

Sinker EDM stands out especially in the following applications:

♦ Mold Cavities

• Injection mold pockets
• Deep and closed geometries
• Sharp-cornered internal forms

♦ Precision Detail Machining

• Complex surface details
• Cavities requiring tight tolerances

♦ Hard Materials

• Hardened steels
• Special alloys

In such applications, sinker EDM ensures production reliability and dimensional accuracy.

Key Differences Between Wire EDM and Sinker EDM

Wire EDM and sinker EDM are often confused; however, their purposes differ.

For this reason, these two methods are not alternatives to each other but complementary.

When Should Sinker EDM Be Preferred?

Sinker EDM is the right choice especially in the following cases:

• When closed and deep cavities must be machined
• When complex internal mold geometries are present
• When sharp internal corners and fine details are required
• When precise cavities must be produced in hardened materials

In such cases, sinker EDM is preferred over wire EDM.

Related product group: You can find detailed information about sinker EDM machines for different applications.

What Are the Advantages of Sinker EDM?

Sinker EDM machines offer the following advantages:

• High precision in complex internal geometries
• Stable machining of hard materials
• Excellent results in mold internal details
• Metal removal without mechanical stress
• Repeatable and controlled production

These features make sinker EDM indispensable in mold manufacturing.

Does Sinker EDM Have Any Limitations?

Like any manufacturing method, sinker EDM also has certain limitations:

• Electrode manufacturing time is required
• Machining time may be longer compared to wire EDM
• Electrode wear must be taken into account

Therefore, selecting the correct method according to the application is crucial.

Who Is a Sinker EDM Machine Suitable For?

Sinker EDM machines are particularly ideal for:

• Mold manufacturers
• Companies engaged in precision metal machining
• Businesses producing high-tolerance internal geometries

For detailed information about sinker EDM machines and applications and to determine the most suitable solution for your business, you can contact us.

Contact our expert team for sinker EDM solutions

Technical reference: For general information on Electrical Discharge Machining (EDM) technologies, see Wikipedia – EDM