Union BT 130

The Union BT 130 is a table-type CNC horizontal boring and milling machine with a 130 mm diameter spindle, built by Union Chemnitz GmbH in Germany. Positioned above the BT 110 in Union's horizontal boring mill lineup, the BT 130 targets the machining of large, heavy prismatic workpieces requiring high-torque boring, heavy-duty face milling, and precision contouring in a single setup. Applications span power generation, mining machinery, large hydraulic systems, and heavy infrastructure equipment manufacturing.

The BT 130 uses a conventional table-type layout: the workpiece is mounted on a CNC-controlled rotary table that provides the B-axis, allowing multi-face machining without part removal. The headstock travels vertically (Y-axis), the spindle extends axially (W-axis), and the column moves longitudinally (Z-axis), while the table travels transversely in the X-axis. This four-plus-one-axis architecture is standard for table-type horizontal boring mills and provides excellent access to all vertical faces of large prismatic components.

With a 130 mm spindle diameter and a multi-step gearbox delivering up to 40,000 Nm of spindle torque, the BT 130 handles the most demanding roughing operations in cast iron, alloyed steel, and stainless steel — including large-diameter boring bar operations on turbine and compressor casings. The X-axis table travel extends to 4,000 mm and the rotary table load capacity reaches 25,000 kg, accommodating large weldments and heavy castings common in energy and mining equipment manufacturing.

Union equips the BT 130 with the Siemens SINUMERIK 840D sl control as standard, providing full 5-axis simultaneous interpolation capability and Union's application-specific cycles for precision boring, facing head operations, and thread milling. An optional CNC facing head (U-axis) expands the machine's capability to turning large-diameter flanges and circular grooves, reducing the need for separate lathe operations on parts with large-bore features.