Electrical discharge machining, also sometimes known as spark machining or spark eroding, is a metal cutting process whereby a desired shape is obtained by using electrical discharges. Material is rem
An electrical discharge machine
CNC Wire-cut EDM machine
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.
EDM control panel (Hansvedt machine). Machine may be adjusted for a refined surface (electropolish) at end of process.
Saw
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A saw is a tool consisting of a tough blade, wire, or chain with a hard toothed edge used to cut through material. Various terms are used to describe toothed and abrasive saws.
Electrical discharge machining
…is called the workpiece electrode, or workpiece. The electrode can be in any of several forms: when it is a wire, it is well suited to cutting a thin kerf, and the process is called wire EDM (also sometimes wire burning or wire erosion); when it is a block with a shape cut into it, it is well suited to…
Rip saws of various sizes
Roman sawblades from Vindonissa approx. 3rd to 5th century AD
Bronze-age saw blade from Akrotiri, late Cycladic period c. 17th century BC
Saw grinding in Sheffield, 1860