... equipment and designing and machining capability. 4 meter Hobbing Machine (slewing ring) Import excavator and truck cranes slewing ring ... suitable for many Engineering Machinery,for example,Slewing Conveyer,Welding Operation Machine,Pint-size&Medium-sized Crane,and so on2. ... for many Engineering Machinery,for example,Slewing Conveyer,Welding Operation Machine,Pint-size&Medium-sized Crane,and so on. ...