The experimental work of this study leads with electro discharge machining
(EDM). A system for machining in this process has been developed. Many
parameters are studied such as current, dielectric fluid, thickness of the workpiece.
The main aim of this work is to calculate the metal removal rate (MRR), electrode
wear (EW) using copper electrode when machining stainless steel 304 specimens
of thickness (0.4, 0.5, 1mm). Different current rates are used ranging from (10, 15,
20, 25, 30)Amp, and using tap water as a dielectric solution, it found that low
current gives a less material removal rate and electrode wear while high current
gives a high material removal rate and electrode wear, the dielectric fluid is
changed in order to enhance results. The results show that maximum MRR is
achieved 1.01164mm3/min when machining thickness of workpiece 0.4mm and
using electrode of copper metal which gives minimum EW 0.04gm, while when
using thickness 0.5mm it gives MRR 0.43828mm3/min and EW 0.12gm, for
thickness 1mm the MRR 0.33964mm3/min and EW is 0.11gm. The results show
also that using distilled water as a dielectric fluid with copper electrode and
thickness of workpiece 0.5mm gives minimum MRR 0.13854mm3/min and less
EW 0.08gm compared with using tap water.