Mitsubishi EA28V CNC Sinker EDM

The Mitsubishi EA28V CNC Sinker EDM appears here with a compact envelope: table travel of 300x200x200 mm in X, Y and Z, a maximum workpiece of 450x340x250 mm and a workpiece weight limit of 450 kg. This configuration is not in Mitsubishi Electric's current lineup, and the listed figures differ sharply from the EA28V Advance, which has travels of 650 mm (25.6 in), 450 mm (17.7 in) and 350 mm (13.8 in) and a 2000 kg (4409 lb.) table load. Anyone looking at a machine sold as an EA28V should take its travels from the machine's own documentation before anything else.

Taken as listed, this is a machine for small cavities and inserts. The 200 mm of Z travel has to cover the electrode, its holder and the depth of the burn, so deep ribs in a tall workpiece will run out of stroke well before the 250 mm workpiece height is used up. Finishing conditions are listed at Ra 0.2 micron with the Mitsubishi EX digital generator, and the control is a Mitsubishi M800 CNC.

Two items are options and should not be assumed on a given machine: the CNC rotary C-axis, listed for helical burning, and the auto electrode changer. Without the changer every electrode swap is manual, which matters for unattended rough-and-finish sequences. The dielectric row reads kerosene or deionized water depending on the workpiece, so check which fluid the machine in question is set up for. Electrical supply is 200V three-phase.