This CBC gantry machining center can be widely applied in all types of large-scale machining, automotive mold processing, as well as military project, fossil oil, mining etc. It adopts dynamic beam gantry structure, constant strength of resin sand casting, via dynamic finite element analyzing, which matches reasonable structural strength and reinforcing rib, to ensure the high rigidity and heavy-loading of basic components. It can be once clamped and completed milling, boring, drilling, expanding, hinging, multi-tapping and other else processing.