Abstract: This invention comprises a portable impact driven log cone splitter mounted to a power source such as a chain saw power unit. The wood or log splitter is coupled to a chain saw power unit through an appropriate gearing arrangement in one preferred embodiment. The blade is removed from the conventional power saw unit and the wood splitter is readily mounted thereto in an orientation having a hollow splitting screw cone with a starter tip parallel to the longitudinal axis of the unit. The cone is mounted over an impact drive unit which is coupled to the gearing arrangement to provide a safe reliable drive. This arrangement also permits a portable log splitting unit which is relatively inexpensive and simple to use and with the cone removed permits use as an impact tool.