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Products 46 MoldMaking Technology November 2015 Bridge Mills Offer Large-Load Handling in Smaller Footprint Available from Absolute Machine Tools, the Johnford DMC series bridge mill is built from a one-piece Meehanite cast iron bridge/column assembly that takes up less floor space than comparable C-frame VMCs. It is available in both moving-table and sliding-column versions, and features a long base casting that completely supports the table over the full 51" of Y-axis travel, enabling machining of very large loads. The Y and Z axes hold fixed loads at all times, while the X axis carries the only dynamic load, allowing for tight machining and tight tolerances during high-speed machining operations. Because there is no table overhang, X-axis pitch and yaw are eliminated. The spindle centerline-to-column distance also is minimized, offering further rigidity. The machine's heavily ribbed cast iron construction is said to provide long tool life and part surface finish. The combination of twin screw-type conveyors and a caterpillar conveyor also ensures complete chip removal with little manual cleaning, the company says. Additionally, finite element analysis (FEA) is used to design each bridge mill, simulating the effects of real-world conditions, including vibration, heat, fluid flow and other physical impacts. Machines include the DMC 900-1500H small-frame bridge mill series, which features a fixed column with moving table; X-axis travel from 35.4" to 59.1", Y-axis travel of 35.4"and Z-axis travel of 30"; and table load capacities ranging from 6,600 to 13,200 lbs. The DMC 1600-3100H medium-frame series offers a fixed- column construction with moving table; X-axis travel from 63" to 161.4", Y-axis travel of 51.2" and Z-axis travel of 31.5"; and a table load capacity of 13,200 lbs. Absolute Machine Tools Inc. / 440-960-6911 / absolutemachine.com Drop-in Hot Runner Features Easy Nozzle Connections Available in both hot-tip or valve-gate configurations, Ewikon's L2X drop-in hot runner system is pre-assembled and pre-wired, with nozzles directly attached to the manifold using a screw mecha- nism that consists of a connecting collar. This design screws the nozzles to the manifold, but enables them to freely rotate during the installation in order to precisely align the connection cables with cutouts in the mold. The nozzle position is then fixed by tightening the connecting collar, eliminating the possibility of plastic leakage between the manifold and nozzle. This system enables quick and easy disassembly of the nozzles for maintenance work, and then allows them to be easily be returned to the same positions. The nozzles use an integrated heater design whereby the heater is pressed into a channel that is milled directly into the melt-carrying pressure tube. This is said to offer a theoretical advantage over conventional heating with heater bands or heater elements, because it provides direct heating of the pressure tube. According to the company, this design provides stable heating with mini- mal heat lost, resulting in an even temperature profile along the whole length of the nozzle and enabling the system to be used in processing of a range of materials, including engineering plastics and reinforced materials. The L2X system comes with two fully balanced manifold versions, nozzles in lengths ranging to 350 mm and flow channel diameters from 6 mm to 12 mm. Customers can choose between open gating and valve gating, depending on application needs. Ewikon Molding Technologies Inc. / 815-874-7270 / ewikonusa.com