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Wire EDM makes no contact with the work piece and disregards hardness.

I am using EDM to cut different materials, and I notice a clear distinction between the rate each material gets cut. For example, copper is extremely slow, while aluminum is much faster -- almost three times faster than copper. Lead also gets cut by EDM very easily.

My question is what determines the distinction in cutting speed for different material? Is it the melting point, or the energy of fusion, or something else?

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  • $\begingroup$ Sounds like melting temperature from the materials you list. It's supposed to be boiling off or vapourizing the metal with sparks. $\endgroup$
    – DKNguyen
    May 20 at 18:33
  • $\begingroup$ What characteristic changes at the rates you notice? $\endgroup$
    – Solar Mike
    May 20 at 19:03
  • $\begingroup$ probably a difference in heat conductivity and maybe in electrical conductivity $\endgroup$
    – jsotola
    May 21 at 1:19
  • $\begingroup$ Maybe specific heat or boiling point? Thermal conductivity shouldn't matter since the heat application is so fast. $\endgroup$
    – Drew
    May 22 at 16:35
  • $\begingroup$ This is an interesting question. If you can post the data from some different materials we can try to look for a relationship (if the answer is not already published and known by somebody). $\endgroup$
    – Drew
    May 22 at 16:36

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