Mitsubishi Electric EA8PV Advance

The Mitsubishi Electric EA8PV Advance is a compact sinker EDM with 300 mm (11.8 in) of X travel and 250 mm (9.8 in) each of Y and Z, a 500 x 350 mm (19.7 x 13.8 in) table and a total system weight of 2000 kg (4409 lb.). Its FP80V-A power supply delivers a maximum machining current peak of 80 A, and the control is the C31EA-2 Advance unit with a 15-inch color TFT-LCD touch screen.

Most rows of the table come in two versions, because the work tank can be ordered as an automatic elevation tank. With the standard tank the machine measures 1460 x 1900 x 2075 mm (57.5 x 74.8 x 81.7 in) and the tank's inner dimensions are 770 x 500 x 230 mm (30.3 x 19.7 x 9.1 in). The automatic elevation tank option makes the machine 1615 x 2030 x 2075 mm (63.6 x 79.9 x 81.7 in) and gives 760 x 520 x 260 mm (29.9 x 20.5 x 10.2 in) inside.

The difference that matters is height under fluid. The standard tank accepts a workpiece of 740 x 470 x 130 mm (29.1 x 18.5 x 5.1 in), with the fluid level adjustable from 90 to 180 mm (3.5 to 7.1 in) above the top of the table. The elevation tank changes that to 730 x 490 x 160 mm (28.7 x 19.3 x 6.3 in) and 85 to 210 mm (3.5 to 8.3 in). Either way this is a machine for low workpieces. The 250 mm (9.8 in) of Z is well beyond the part height the tank allows, so the stroke goes to electrode length and retraction, not to tall blocks.

Loads are modest. The table takes 550 kg (1213 lb.), the electrode limit is 25 kg (55 lb.), and the table top sits 900 mm (35.4 in) from the floor. The dielectric reservoir holds 165 L (43.6 gal.), filtered through one fine paper filter and cooled by a unit cooler. With the elevation tank the initial dielectric fluid supply is 175 L (46.2 gal.).