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| [[Electric discharge machining]] || (EDM), also known as spark machining, spark eroding, burning, die sinking, or wire erosion, is a manufacturing process in which the desired shape is obtained using electrical discharges (sparks). Material is removed from the workpiece by a series of rapidly recurring [[Electric current|current]] discharges between two electrodes, separated by a [[dielectric fluid]] and subject to an electric [[voltage]]. One of the electrodes is called the tool electrode, or simply the "tool" or "electrode", while the other is called the workpiece electrode, or "workpiece".
EDM can be broadly divided into "sinker" type processes, where the electrode is the positive shape of the resulting feature in the part, and the electric discharge erodes this feature into the part, resulting in the negative shape, and "wire" type processes. Sinker processes are rather slow as compared to conventional machining, averaging on the order of 100mm<sup>3</sup>/min,<ref>{{Cite journal |last=Klocke |first=F. |last2=Schwade |first2=M. |last3=Klink |first3=A. |last4=Veselovac |first4=D. |date=2013-01-01 |title=Analysis of Material Removal Rate and Electrode Wear in Sinking EDM Roughing Strategies using Different Graphite Grades |url=https://www.sciencedirect.com/science/article/pii/S2212827113001534 |journal=Procedia CIRP |series=Proceedings of the Seventeenth CIRP Conference on Electro Physical and Chemical Machining (ISEM) |volume=6 |pages=163–167 |doi=10.1016/j.procir.2013.03.079 |issn=2212-8271}}</ref> as compared to 8x10<sup>6</sup> mm<sup>3</sup>/min for conventional machining, but it can generate features that conventional machining cannot. Wire EDM operates by using a thin conductive wire, typically brass, as the electrode, and discharging as it runs past the part being machined. This is useful for complex profiles with inside 90 degree corners that would be challenging to machine with conventional methods.|| [[File:EDMWorkpiece.jpg|thumb|
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| Multi-spindle machine || Type of [[Automatic lathe|screw machine]] used in mass production. Considered to be highly efficient by increasing productivity through automation. Can efficiently cut materials into small pieces while simultaneously utilizing a diversified set of tooling. Multi-spindle machines have multiple spindles on a drum that rotates on a horizontal or vertical axis. The drum contains a drill head which consists of several spindles that are mounted on [[ball bearing]]s and driven by [[gear]]s. There are two types of attachments for these drill heads, fixed or adjustable, depending on whether the center distance of the drilling spindle needs to be varied.<ref>{{Cite news|url=https://www.davenportmachine.com/multi-spindle-machines/|title=Multi Spindle Machines - An In-Depth Overview|work=Davenport Machine|access-date=2017-08-25|language=en-US}}</ref> ||
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