The EDM process is most widely used by the mould-making tool
and die industries, but is becoming a common method of making prototype and
production parts, especially in the aerospace, automobile and electronics
industries in which production quantities are relatively low.
Advantages
Some of the advantages of EDM include machining of:
(a) Complex shapes that would otherwise be difficult to produce
with conventional cutting tools.
(b) Extremely hard
material to very close tolerances.
(c) Very small work pieces where conventional cutting tools
may damage the part from excess cutting tool pressure.
(d) There is no direct contact between tool and work piece.
Therefore delicate sections and weak materials can be machined without any
distortion.
(e) A good surface finish can be obtained.
(f) Very fine holes can be easily drilled.
(g) Electrically non-conductive materials can be machined only
with specific set-up of the process.
Disadvantages
Some of the disadvantages of EDM include:
(a) The slow rate of material removal.
(b) The additional time and cost used for creating
electrodes for ram/sinker EDM.
(c) Reproducing
sharp corners on
the work piece
is difficult due to
electrode wear.
(d) Specific power consumption is very high.
(e) Power consumption is high.
(f) "Over cut" is formed.
(g) Excessive tool wear occurs during machining.
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