Sinker EDM

Sinker EDM, also known as plunge EDM, creates shapes in metal surfaces by spark erosion, using a shaped electrode formed as the reverse of the desired shape.

Sinker EDM can cut hard materials that would be difficult to cut using conventional machining. The process can also cut difficult shapes such as sharp inside corners and deep small precision holes but shapes must not have undercuts, grooves, etc.

A few example of parts that can be manufactured using sinker EDM include injection mold tooling, micro hole drilling, punch and die tooling, scientific research apparatus, etc. Sinker EDM can cut a variety of metals including very hard and exotic metals. Custom tooling in the reverse shape of the desired formation is needed for the process.

Cost reduction options include reducing plunge depth and reducing complexity.

Sinker EDM Design Considerations

• Sharp inside corners are possible but difficult due to tool erosion.