The BM-4035/4042 is a high-capacity, beam-moving bridge-type CNC milling machine center within the BM Series, characterized by its ability to handle large workpiece machining with a maximum height clearance of 2-400 mm. The machine’s structural integrity is secured by a double-beam configuration, utilizing a fixed beam for rigidity and parallelism and a movable beam for dynamic straightness and cutting power. The standout feature is the movable cross rail, or W-axis, with a standard travel of 1-000 mm, which is precisely controlled by a dual synchronized servo motor driving system and supported by dual hydraulic cylinders. This movable beam allows the machine to perform W-axis feed cutting synchronic with other axial feeding, a unique technique ensuring the best dynamic straightness and heavy cutting capability, a standard feature across all BM series 5-face machines.

The BM-4035/4042 model offers substantial capacity with an X-axis travel of 4-100 mm and a selectable Y-axis travel of 3-500 mm or 4-200 mm. The table size is 4-000 mm by 3-000 mm, engineered to support a maximum load of 20-000 kg. The machine is equipped with a standard 4-000 RPM, 2-step gear spindle with power up to 26 kW, with options for higher RPM and power. The inclusion of multi-angle head attachments enables full automatic 5-face machining operations. For precision, the W-axis uses dual linear scales and its parallelism is controlled by a rationing hydraulic system, guaranteeing accuracy even with the headstock at different positions.

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