Abstract: An improved rotatable and expandable spindle assembly, which is adapted for cantilever mounting in and on a machine base. The spindle assembly has an integrally mounted multi-ported directional control valve for point of use operation. The valve is connected to a constant supply of a pressurized medium and is mounted at and on the free end of the spindle assembly. The spindle and valve arrangement is adapted for a rapid expansion or collapsing of the spindle when and as desired by an operator.