Bridge type boring and milling machine is widely used for rough and fine machining of large engine-base kind compoents with complex shape,large box parts and various kinds of rotating components. It is espcially suitable for machining large precise components in ship building, power generation ,traffic,metallurgy and construction machinery industries and so on.Bridge type boring and milling machine can be divided into travelling bridge( gantry type) and fixed bridge( portal type),and each type can also be classified into the one fixed height cross-rail and the ones variable height cross-rail. The specifications of machine can be confirmed by the customers according to their requirements.