Makino EDAF3-FH

The Makino EDAF3-FH (EDAF3-Fine Hole) puts 4-axis CNC ram EDM and high-precision EDM hole drilling on one machine, with 450 mm (17.7 in) of X and 350 mm (13.8 in) of Y and Z over a 700 x 500 mm (27.5 in x 19.7 in) table. Makino describes it as matching the EDAF2-Fine Hole in performance but with larger strokes and a larger work tank, here 850 x 650 x 400 mm (33.5 in x 25.6 in x 15.8 in), for bigger parts up to 800 kg (1,760 lb).

The drilling hardware is the part to understand. A programmable W-axis runs parallel to the Z-axis but moves independently, positioning an arm that carries the Die Guide and a Middle Guide. The Middle Guide stops small diameter electrodes from vibrating or bending during drilling. When the job is ordinary ram EDM work, the whole W-axis arm comes off in less than a minute through quick disconnects and a Curvic coupler, leaving the work zone clear. A high speed C-axis is standard, giving precision indexing and continuous rotation up to 2,000rpm, and high pressure flushing is offered at 6 MPa or 10 MPa.

Drilling is done in EDM dielectric oil rather than water, which Makino credits with better drilling accuracy, edge quality and metallurgical results. Makino lists Die/Mold work and production details in the Automotive, Medical and Aerospace fields as typical uses.

The tool changer comes with 8, 16 or 32 positions, and rapid traverse is 5 m/min (197 in/min). The dielectric reservoir sits in the base casting, and chilled fluid circulates through the Y-Axis and Z-Axis structures to hold the machine at a stable temperature. A 3-sided programmable Rise and Fall work tank gives open access and suits automation, and a U/V Flame Sensor and Fire Extinguisher system is fitted for unattended running. The control is Makino's Hyper-i with a 24" class touch screen, an on-board training system and E-Tech Doctor functions.