EDM is no longer a “non-conventional” machining method. It is claimed that EDM is now the fourth most popular machining method, leading behind milling, turning and grinding. One of the major reasons for the turnaround is that in today’s context, EDM machines have dramatically increased their cutting speeds, surface finishes and accuracies with unattended operations. As a result, the sale of these machines has increased dramatically with the growth of EDM technologies.

Since its first wholly developed Sinker and Wire EDM in 1981, Makino has continuously evolved as a market leader in EDM with over 140 patents. Having invented EDM technologies that provide faster machining rates with high accuracies and high surface finishes, Makino has met the most complex geometries demands from the Die and Mold industries. Makino offers the world’s only horizontal Wire EDM machines – UPH, UPJ and UPN series which can deliver accuracy of less than 1um for UPN.

It is essential to understand the EDM process to remain in touch with the cutting edge technologies that help to shape the modern world manufacturing processes. Following are the 3 types of basic EDM processes:

  • Ram EDM

  • Wire EDM

  • Small Hole EDM



Ram EDM is also known as Sinker EDM, Die Sinker, Vertical EDM and Plunge EDM. In this process, the desired shape is formed when sparks jump from the electrode to the work piece and cause material to be removed from the work piece. Ram EDM is generally used to produce the blind cavities such as Mobile phone cavities, Speaker grill cavities etc.

Wire EDM

In Wire EDM, the spark jumps from the wire (which acts as a electrode) to the work piece and erodes both the wire and the work piece. In this case, the wire keeps unwinding to replace the eroded wire. This process is used for through shapes machining like stamping tools for sheet metal components.



Small Hole EDM

Also known as fast hole EDM drilling, hole popper and start hole EDM drilling, this form of EDM process uses a hollow electrode to drill holes by means of electrical discharge machining by eroding material from the work piece. Makino provides more than just a rough operation, extending the limit to achieve the highest accuracy and hole diameter. Such precision is utilized in the application of Aerospace components (cooling holes in turbine engine blades), ink jet/laser jet cartridge nozzles etc.