What type of milling machine is recognized for having a spindle mounted in the column?

The type of milling machine recognized for having a spindle mounted in the column is the column-and-knee milling machine. This design features a stationary column that supports the spindle, allowing for vertical and horizontal movement of the workpiece and the milling head. The column-and-knee configuration offers significant versatility and can accommodate various machining operations, making it a common choice in manufacturing environments.

The vertical milling machine also has a spindle mounted in a vertical orientation, but it does not have the same knee structure that allows for more complex machining processes. The horizontal milling machine's spindle is oriented horizontally, which contrasts with the column-and-knee design. The universal milling machine has the capability to perform both vertical and horizontal milling operations but its spindle orientation and mechanics differ from those of the column-and-knee configuration.