Bridge Mills Machine Massive Parts

IMTS 2018: Available from Absolute Machine Tools, the Johnford DMC LH series of double-column, moving-table bridge mills are designed for the largest machined parts. 


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Beginning with a large Meehanite iron casting, every element of Johnford’s DMC LH series of double-column moving table bridge mills is designed for large-part machining. Available from Absolute Machine Tools, the machines offer X-axis travels ranging from 122" to 244" (3100 to 6100 mm) in 39.4" (1 meter) increments. The Y axis measures 110" (2800 mm), and the Z-axis travel is 32". Z-axis travels measuring 42" and 60" are also available.

A long base casting supports the table over the full X-axis travel, enabling machining of very large loads. The Y and Z axes hold fixed loads, while the X axis carries dynamic loads. This facilitates tight machining and tight tolerances during high-speed machining operations. Without table overhang, X-axis pitch and yaw are eliminated. The spindle centerline-to-column distance is minimized, contributing to rigidity. The machine’s ribbed cast iron construction improves tool life and part surface finish. The combination of surround-table guarding with twin screw-type conveyors and a caterpillar conveyor contributes to chip removal and reduces the need for manual cleaning. Finite element analysis is used to design each bridge mill, simulating the effects of real-world conditions, including vibration, heat, fluid flow and other physical impacts.

The DMC-3100LH, 4100LH, 5100LH, and 6100LH all feature rigid boxways in Y and Z and Schneeberger roller ways in X to increase carrying capacity. Two-speed, gearbox-driven, 35-horsepower spindles provide heaving cutting power and torque. Spindles with 50 horsepower are available.  A 40-tool automatic toolchanger (with 60, 80 and 120 options available) facilitates rapid tool changing.


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