A Gantry Milling Machine is a heavy-duty machining center characterized by its bridge-like (gantry) structure that moves over a stationary workpiece. This robust design provides exceptional stability and a massive work envelope, making it ideal for machining extremely large parts. The cutting spindles are mounted on the cross-rail, which can often accommodate multiple heads for simultaneous operations. Renowned for their power and precision, these machines are essential in industries like aerospace, automotive, and energy for machining large molds, frame components, and marine diesel engine blocks.