Editing Electrical discharge machining (section)

==Applications==
{{Unreferenced section|date=November 2017}}

===Prototype production===
The EDM process is most widely used by the mold-making, tool, and [[die (manufacturing)|die]] industries, but is becoming a common method of making prototype and production parts, especially in the aerospace, automobile and electronics industries in which production quantities are relatively low. In sinker EDM, a [[graphite]], copper tungsten, or pure [[copper]] electrode is machined into the desired (negative) shape and fed into the workpiece on the end of a vertical ram.

===Coinage die making===
[[File:EDMWorkpiece.jpg|thumb|Master at top, badge die workpiece at bottom, oil jets at left (oil has been drained). Initial flat stamping will be "dapped", see [[sinking (metalworking)]], to give a curved surface.]]
For the creation of dies for producing jewelry and badges, or blanking and piercing (through use of a [[pancake die]]) by the coinage (stamping) process, the positive master may be made from sterling silver, since (with appropriate machine settings) the master is significantly eroded and is used only once. The resultant negative die is then hardened and used in a [[power hammer|drop hammer]] to produce stamped flats from cutout sheet blanks of bronze, silver, or low proof gold alloy. For badges these flats may be further shaped to a curved surface by another die. This type of EDM is usually performed submerged in an oil-based dielectric. The finished object may be further refined by hard (glass) or soft (paint) enameling, or electroplated with pure gold or nickel. Softer materials such as silver may be hand engraved as a refinement.

[[File:HansvedtEDMControls.jpg|thumb|left|EDM control panel (Hansvedt machine). Machine may be adjusted for a refined surface (electropolish) at end of process.]]

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===Small hole drilling===
[[File:GaTurbineBlade.svg|thumb|A [[turbine blade]] with internal cooling as applied in the high-pressure [[turbine]].]]
[[File:Small hole drilling EDM machines.jpg|thumb|Small hole drilling EDM machines.]]

Small hole drilling EDM is used in a variety of applications.

On wire-cut EDM machines, small hole drilling EDM is used to make a through hole in a workpiece through which to thread the wire for the wire-cut EDM operation. A separate EDM head specifically for small hole drilling is mounted on a wire-cut machine and allows large hardened plates to have finished parts eroded from them as needed and without pre-drilling.

Small hole EDM is used to drill rows of holes into the leading and trailing edges of [[turbine blade]]s used in [[jet engine]]s. Gas flow through these small holes allows the engines to use higher temperatures than otherwise possible. The high-temperature, very hard, [[single crystal]] alloys employed in these blades makes conventional machining of these holes with high aspect ratio extremely difficult, if not impossible.

Small hole EDM is also used to create microscopic orifices for fuel system components, [[spinneret (polymers)|spinneret]]s for synthetic fibers such as [[rayon]], and other applications.

There are also stand-alone small hole drilling EDM machines with an ''x''–''y'' axis also known as a super drill or ''hole popper'' that can machine blind or through holes. EDM drills bore holes with a long brass or copper tube electrode that rotates in a chuck with a constant flow of distilled or [[deionized water]] flowing through the electrode as a flushing agent and dielectric. The electrode tubes operate like the wire in wire-cut EDM machines, having a spark gap and wear rate. Some small-hole drilling EDMs are able to drill through {{convert|100|mm|in}} of soft or hardened steel in less than 10 seconds, averaging 50% to 80% wear rate. Holes of {{convert|0.3 to 6.1|mm|in}} can be achieved in this drilling operation. Brass electrodes are easier to machine but are not recommended for wire-cut operations due to eroded brass particles causing "brass on brass" wire breakage, therefore copper is recommended.

===Metal disintegration machining===
Several manufacturers produce EDM machines for the specific purpose of removing broken [[cutting tool (machining)|cutting tools]] and [[fastener]]s from work pieces. In this application, the process is termed "metal disintegration machining" or MDM. The metal disintegration process removes only the center of the broken tool or fastener, leaving the hole intact and allowing a ruined part to be reclaimed.

===Closed-loop manufacturing===
[[Closed-loop manufacturing]] can improve the accuracy and reduce the tool costs