A CNC double column vertical lathe machine is a specialized type of computer numerical control (CNC) machine tool that is used to perform turning operations on large and heavy workpieces. The double column design of the machine provides high stability and rigidity, allowing for high precision and accuracy in machining large and heavy parts.

The double column vertical lathe machine consists of a large vertical bed with two columns that support the spindle and the workpiece table. The spindle is mounted on a movable ram, and it rotates the workpiece as it moves in the Z-axis direction. The workpiece table is mounted on the base and it moves in the X and Y axis.

A CNC double column vertical lathe machine is typically used for the machining of large and heavy workpieces such as the production of large gears, large shafts, and other components for the aerospace, shipbuilding, wind turbine, mining and power generation industries. They can perform a wide range of turning operations such as turning, facing, boring, and drilling.

The double column design provides the machine with high rigidity and stability, which is important for precise machining of large and heavy workpieces. The CNC control allows for high precision and repeatability in machining operations, making it suitable for high-volume production runs. Additionally, some machines may have the capability of a fourth axis (B-axis) to enable even more complex operation.