Makino's EDNC65S RAM EDM: Utilizes High Quality Surface Finish Technology


Mason, OH - September 2000 - Makino’s EDNC65S RAM EDM combines rugged construction, simple programming and advanced design and performance features. The result is an EDM that machines 30 percent faster than manual EDM machines, while utilizing Makino’s High-Quality Surface Finish (HQSF) technology to achieve superior speeds and finishes.

Better Surface Finishes, Faster

HQSF uses a powder additive that is mixed with the dielectric fluid to improve electrical conductivity for more consistent discharging and spark diffusion. This diffusion provides a smaller crater for a superior finish without a loss in metal removal rates.




The 5SC additive disperses evenly throughout the tank for the highest possible degree of precision. In fact, in some applications HQSF technology allows you to machine to a mirror finish without benchwork or polishing. It also provides excellent side surface finishes and uniform spark gaps with a high degree of consistency. And HQSF increases surface integrity by 400 percent, while also reducing micro-cracking by 300 percent.

When finish requirements are less than 8mm Rmax, machining speed is markedly faster with HQSF than with conventional methods. The stability of the machining process reduces machining time variation, making it easier to set machining conditions.

Unlike ordinary dielectric fluid, there is no significant decline in machining performance, even during rough machining. As a result, there is no need to change dielectric fluid from roughing to finish machining. HQSF also makes unattended operation possible, greatly improving throughput while reducing costs and machining time.

This new method is expected to find application in many areas, including the machining of ribs and other hard-to-polish shapes.

Easy Operation

The Makino EDNC65S features a "drop tank" design that allows for easier, faster, more accurate setups as well as lower mechanical stress during orbiting. Its three-axis head allows superior dynamic control, burning precision and machine response compared to machines that move the table for axis positioning. Creative engineering, heavy-duty construction and advanced control technology allow high machine productivity, superior machining accuracies.

The drop tank design integrates the rear wall of the tank with the machine base for space and strength gains. The design gives the EDNC65S a large tank size—1100 x 750 x 450 mm—while allowing for an even more massive base. A U-shaped continuous structure provides the other three walls of the tank body. The structure retracts completely into the machine table.

Retractability provides open access to the table for safe, simple slid-on loading and setup. The EDNC65S comes standard with programmable tank raising and lowering. Adjustable tank depth allows optimal machining of dielectric fluid level to workpiece size—shallow for small jobs, high for large—for overall dielectric savings.

Once loaded, the EDNC65S is equally easy to operate. Master "model plan" menus allow simple selection and input of the machining conditions for the desired feature shape and surface finish—then automatically calculate machining time. Graphic prompts allow automated programs to be created without NC programming. Macro-based software optimizes orbital motion machining by the EDNC65S’ three-axis head for superb finish, sharp corners, precise detail and the creation of complex shapes with fewer electrodes.

Proprietary software capabilities include:

  • Flexipath, which permits orbiting in any path and angling of the electrode, similar to wire EDM, for efficient and economical machining of special shapes.
  • Varipath, which applies "intelligent" orbiting to produce sharp corners without flushing. It equalizes metal removal for precise detail and quality finishes (up to .2mm RM).
  • Bottom Stop Complex, which creates curved or prismatic bottom cavities by programmable orbiting of standard electrodes.

Automatic tool change and adaptive controls enable high levels of unattended machining. "A-Jump"—automatic jump machining control—sets jump conditions to the machining job, eliminating the need for operator intervention. This makes it possible to machine small, fine jobs and also deep ribs reliably and accurately without trial runs, regardless of operator skill. MaxAdapt II—new, patent-pending capability—detects undesirable arc conditions and makes the needed corrections. This ensures optimum discharge and prevents surface quality deterioration due to arcing induced by chip buildup.

Compact but versatile, the EDNC65 features an 800 x 550 mm fixed table that enhances machine rigidity. The head provides axis travel of 650 x 450 x 350 mm. The three-axis head and square-type axis travels make it easy to set up, center and "trig out" a job. The machine bed is a heavily ribbed, single piece casting. Anti-friction linear guides and bearings complete the high-performance design, combining excellent rigidity with low-mass dynamics.

Makino is a global provider of advanced machining technology and application support for the metalcutting and die/mold industries. Makino manufacturing and service centers are located in every major country, including the United States, Germany, Japan, Singapore, Italy, France, Korea, Taiwan, China, Mexico, Brazil, India and Turkey and are supported by a worldwide distributor network. For more information call 1.800.552.3288, or visit Makino on the Web at

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