Why 8850 Form Discharged 2016-2023

As erosion continues the machine controls advance the electrode through the work always maintaining a constant gap distance between it and the workpiece to understand how EDM removes metal let's examine a single spark in the erosion process as a pulse of DC electricity reaches the electrode and part an intense electrical field develops in the gap microscopic contaminants suspended in the dielectric fluid are attracted by the field and concentrate at the fields strongest point these contaminants build a high conductivity bridge across the gap as the fields voltage increases this material in the conductive bridge heats up some pieces ionize to form a spark channel between the electrode and the work piece at this point both the temperature and pressure in the channel rapidly increase generating a spark a small amount of material melts and vaporizes from the electrode and work piece at the points of spark contact a bubble composed of the gaseous byproducts of vaporization rapidly expands outward from the spark channel once the pulse ends the spark and heating action stop collapsing the spark channel dielectric fluid rushes into the gap flushing molten material from both surfaces this EDM residue consists of small solidified balls of material and gas bubbles.