EDM rams home with speed, reliability, versatility

A new mechanical design for increased rigidity and reduced thermal distortion is one improvement built into the new EDAF Series of ram EDM equipment from Makino (Auburn Hills, MI).

The EDAF-series's  Z-Axis Stabilizer technology for liquid cooling of the Z-axis ball screw and nut, allowing cavity floor surface blending to within one micron.

This attribute is especially relevant for toolmakers facing uncontrolled thermal environments and long hours of unattended burning, according to the vendor. EDAF-series machines are also equipped with an improved servo system for rapid response to signals from the spark gap monitoring circuits, enabling cycle time reductions of 10-20% in burns common to today's applications. The EDAF series features two models, the EDAF2 and EDAF3, with X, Y, and Z axis travels of 13.8 inches, 9.8 inches, 9.8 and 17.7 inches, 13.8 inches, 13.8 inches respectively. The EDAF2 provides worktable dimensions of 21.7 x 13.8 inches with a payload of 1102 lb, while the EDAF3 offers table dimensions of 27.8 x 19.7 inches with a maximum payload of 1764 lb.

Furthermore, Makino's new ArcFree Technology for spark gap monitoring helps prevent destructive DC arcs that typically lead to time-consuming clean-up procedures or scrapped tool components. In addition, a new on-board programming system, Makino Program Generator (MPG), is designed to make the Makino MGH control more user friendly, while generating more aggressive model plans to meet the demands of shortened lead times on today's shop floor. By providing answers to simple prompts, and inputting basic data, even novice operators will be able to generate efficient and safe burn routines. This new program generator also allows for programming of multiple electrodes and multiple burn locations.

Additional features include a new automated Power Saving Mode that reduces the machine's power consumption by 70% while idle, a rise-and-fall drop tank design for user friendly workpiece loading/unloading, faster, more accurate setups, and favorable automation capabilities, and an optional fine-hole configuration for precision machining of details smaller than the eye can see. —Stephen Moore