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P R O D U C T S & S E R V I C E S
Wire-Cut EDMs Suitable for Daily Workshop Employment Are
Designed to Be Technically and Economically Cutting-Edge
After presenting the first prototype
of a new wire-cut
EDM machine at Tokyo’s
JIMTOF fair last year, Mitsubishi
Electric plans to introduce
its high-precision
NA Essence wire EDM series
to the European public at
EMO Milano in October. The
new high-end machine series
combines revolutionary with
evolutionary advances: it was
redesigned from scratch, but
takes advantage of the further
development of proven,
reliable technologies.
The drive system of the NA Essence
is certainly a breakthrough. The machine
uses an optical servo drive system
in combination with tubular direct
drives, a unique concept offering the
benefits of ball-screw drives and conventional
linear drives. This construction
avoids both the interfering magnet-
ic-power influence of linear drives on
the guidance system and unnecessary
heat generation. One result is optimized
energy consumption efficiency.
Thanks to the optical servo drive,
the NA Essence wire-cut EDM reacts in
real time. The machine’s Advance CNC
communicates via fibre-optic cables
with the extremely reactive
drives; thus, the control is
able to handle and transfer
signals instantaneously.
Though the very-highprecision
series is intended
to set standards for quality
and productivity, these are
not machines with limited
application. This is made
clear by their workspace
dimensions. The NA1200
Essence boasts x-y-z travel
paths of 400 x 300 x 220 mm,
while the respective axial
travels for the NA2400 Essence
are 600 x 400 x 310 mm.
Both machines use wires ranging
from 0.05 to 0.30 mm in diameter as
standard. The best surface quality
achievable with the Digital FS (D-FS)
generator is 0.05 μm Ra, depending on
workpiece material and cutting height;
this can always be achieved with plain
www.edme.info/2009/09/068