When it comes to heavy-duty machining, the Lagun Maher Holding BM Series stands in a class of its own. These bed-type milling machines are built for power, precision, and long-term reliability—engineered to take on the toughest jobs without compromise. In this blog, we’ll break down the BM line in five key areas: layout, components, power, control, and standards—giving you a clear look at what makes these machines a trusted choice for serious shops.
The BM Series is anchored by a rigid, floor-mounted design that ensures long-term stability and precision. Each model offers expansive travel distances—up to 5000mm on the X-axis, 1300mm on the Y-axis, and up to 2000mm on the Z-axis—making it ideal for machining large, heavy workpieces. The wide base, reinforced with gray cast iron (EN-GJL-250), absorbs vibration and maintains accuracy over time. With integrated anchoring and leveling systems, as well as a compact footprint for its size class, the BM layout balances massive capacity with smart shop-floor efficiency.
The BM Series is engineered for precision and durability, built around a heavy-duty cast iron structure thermally stabilized and reinforced with internal ribs. Each axis is equipped with precision-ground ball screws—Ø63×30 on the X-axis, Ø63×20 and Ø50×16 on the Z—paired with long guide shoes blocked with mechanical wedges for maximum rigidity and smooth motion. Absolute linear scales provide 0.001mm resolution across X, Y, and Z axes, while an electromagnetic brake secures the vertical axis in the event of power loss. A hydraulic counterweight system further stabilizes the Z-axis, reducing deflection and boosting repeatability.
From the ground up, the BM Series is built with premium components. The bed, column, and ram are all cast from EN-GJL-250 gray cast iron, providing structural strength and vibration control. The column is fixed and reinforced, while the wide ram supports the milling head with solid transverse movement on the Y-axis. The vertical carriage ensures rigid Z-axis travel, and the table is designed for high load capacity—supporting up to 14,000 kg depending on the model. Every structural element is carefully selected and machined to deliver long-term stability and high-accuracy performance in demanding environments.
At the heart of the BM Series is a high-performance spindle system driven by a SIEMENS 31 kW AC motor with a two-speed gearbox, delivering up to 257 Nm of torque. This setup provides constant torque from 0 to 301 rpm and constant power up to 6000 rpm, ensuring flexibility across a wide range of machining operations. Power is transmitted through pulleys and belts, isolating the main shaft from gear vibration and thermal buildup—resulting in smoother cuts and minimal expansion. The robust axis drives, paired with preloaded ball screws and rigid bearings, allow for rapid feeds up to 30,000 mm/min on all axes, making the BM Series a powerhouse for precision milling under heavy loads.
The BM Series is equipped with the Heidenhain TNC 640 control system, offering high-speed multi-axis machining, intuitive touch-screen navigation, and compatibility with both conversational programming and standard G-code. Operators benefit from advanced interpolation, tool management, and diagnostic capabilities—all designed to streamline setup and boost precision. Each machine includes a 19” tactile display, full alphanumeric keyboard, USB and Ethernet ports, and a portable electronic handwheel (HR 510) for fine-tuned control.
Installation is straightforward but critical—requiring a solid, vibration-free foundation, 400V ±10% power supply, and environmental control within ±2ºC for optimal accuracy. Once installed, the machine undergoes a full startup and commissioning process, including axis verification via laser alignment (ISO 230-2), functional checks, and operator training. Remote diagnostics and service options are also available, ensuring continued performance and fast support when needed.
Every BM Series machine is built to meet stringent international standards, including CE compliance and conformity with ISO and UNE geometrical verification protocols. Each unit undergoes precise laser-based axis positioning verification per ISO 230-2, with positioning accuracy of 0.015 mm and repeatability down to 0.008 mm. Structural components are painted with durable, industrial-grade coatings—RAL 7021 dark grey, RAL 3020 red, and RAL 9016 white—to ensure long-lasting protection and a clean, professional finish. Complete documentation is provided with every machine, including digital manuals, part lists, CNC parameters, and verification records, giving customers full transparency and confidence in the machine’s quality and performance from day one.
