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EDM Pg. 5 Wire EDM with Cylindrical Drive Motor Mitsubishi's MV Series with cylindrical drive motor is built on the latest technology in machine construction; the X and Y axis ways and drives are directly mounted to a one-piece, T-shaped case casting, providing the most rigid and thermally stable platform driving the table and column independently, according to the company. This style of direct axis mounting removes all squareness and accuracy issues that come with a stacked table design, providing higher rigidity and smoother movement for more reliable, precise cutting. A redesigned auto-threader concept delivers improved threading capabilities, with upper rollers that travel with Z-axis, creating a constant distance to the upper guide. This allows nearly 14" of annealed/straightened wire length, improving threading reliability on tall parts, submerged threading and rethreading through the gap after a wire break. A large air gap between the shaft and the forcer in the cylindrical drive minimizes heat output and the effect of metallic shop dust on the system. Other EDMs are built using flat plate linear drives, constructed from iron core magnetic coils on the primary side, and permanent magnets on the secondary side. Large Wire EDMs AccuteX EDM, a Division of Absolute Machine Tools, Inc. recently introduced its rigid DS-550CM Die Sinker EDM. Its X, Y, Z working capacity is 20" x 16" x 14" The work table size is 32" x 18" Maximum workpiece size is 47" x 27" x 17", and this machine can accommodate workpiece weights up to 2,970 lbs. Accutex designed the EDM using Finite Element Analysis (FEA) to ensure high accuracy machining. Further contributing to its rigidity is a heavily ribbed, high-grade Meehanite casting. Premium grade components, such as precise drive system, linear bearings, class 5 pre-tensioned fine finish ballscrews, and high resolution servo motors are used, along with roller type linear guideways, and optical scales. Options for the DS-550 for greater flexibility include a built-in C axis with 360-degree indexing, an automatic electrode changer, dielectric cooler, and custom tooling package. Customers can perform 3-axis machining in 6 directions, multi-cavity, circular, square and any angle orbiting, internal/external spherical, and 45-degree corner machining. Further, the EDM can do 3-axis linear machining, 2-axis arc machining, and offers helical machining electrode compensation. The Accutex control's 15" industrial grade LCD monitor is easy to read and in full color. Its software supports dialogue options for simple, straight-forward programming and operation. Sodick, Inc. has released two new machines—the AQ750LH and the AQ1200LH. The AQ Series line of wire EDMs is Sodick's largest. These additions are taking the largest wire EDMs to new heights with an expanded Z height, according to Sodick. All AQ models have linear motor drive technology as standard and are provided with a 10-Year Positioning Accuracy Guarantee. The AQ Series was initially created in response to the growing demand for large capacity wire EDMs featuring extreme taper capability. The models are often ideally suited for automotive molds and dies. The AQ750LH features a 24" Z cutting capacity and a fixed table design that allows for a workpiece with greater weight to be machined without affecting the table positioning or workpiece accuracy. Additional standard features include an L-Cut wire chopper, high-speed generator, low maintenance tank seal, multi-filtration system, wire jumbo feeder, Super Jet AWT and vertical sliding tank door. The X, Y travel on this machine is 29.53" x 16.68". The AQ1200LH, which also features a 24" Z axis, has an X, Y travel of 47.24" x 31.50". The AQ models provide industry-unique, UV axis travels that allow extreme taper angles (up to 45 degrees) to be machined to the full Z capacity of the model, the company reports. As the UV travels are larger than the XY movements, tapering can even be performed beyond the normal XY travels of the machine. The control incorporates collision protection that constantly monitors voltage in the axes drives. When voltage exceeds a pre-determined load, the machine will stop and give the operator an error message. With a linear motor drive system; there is no mechanical connection between the linear motor drives and the table. The control also features automatic machining condition selection. This is a database within the machine that contains details on the best conditions for a particular wire diameter, workpiece material or workpiece thickness and ensures the best possible machining results. The operator can make use of the extensive conditions provided by Sodick or add their own conditions to suit unusual applications. For more information from Accutex EDM of Mason, OH, phone 513-701-5550 or visit accutexedm.com For more information from Sodick, Inc. of Schaumburg, IL, phone 847-310-9000 or visit sodick.com For more information from Mitsubishi Laser/MC Machinery Systems, Inc. of Wood Dale, IL, phone 630-616-5920 or visit Mitsubishi-laser.com Heavy-Duty Die Sinker EDM 98 MoldMaking Technology July 2013