The heavy duty Willis Mammoth SK & SE series conventional lathes are extremely robust, well-built, and dependable lathes. The SK & SE lathes have precision ground spindles supported at three points by high precision bearings. These hollow spindle lathes incorporate a straight forward, low maintenance design. Willis Mammoth SK & SE series geared head engine lathes feature large, widely spaced bed ways and a large diameter lead screw for maximum rigidity and minimum vibration. These lathes have a standard 4⅛” hollow spindle bore, and offer an optional 6” hollow spindle bore for the SE series. In addition, an optional rear chuck adaptor, specifically designed for large diameter pipes and shafts requiring maximum holding power, for applications like oil field work, ship building, conveyor manufacturing, roller manufacturing, and hydraulic cylinder manufacturing is available on Willis geared head precision lathes.