Authors
Abstract
Machining of electrically non-conducting materials like glass is still a major
problem. The principle of electric arc was used to generate high electrical
discharge (spark) at high currents to machine non-conducting materials at any
hardness.
EDM system was build for machining of non-conducting cutting materials
such as glass including the use of powder (graphite) mixed for dielectric solution
(tap water) by supplied DC current values (200, 250, 300, 350 and 400A). Voltage
of (70V) was used to cut 3mm thickness of borosilicate glass (BSG) to obtain the
average surface roughness (Ra) of about (0.003-0.012μm).
Matlab program has been used to investigate the process control for EDM that
could the Ra experimental and theoretical with accuracies of 94.236, 94.034,
96.628 and 92.875% respectively.
From the reading of the magnitude of the roughness it was found that differences
between the theoretical and experimental values for 3mm thickness of BSG was
never exceed (8%).
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