Abstract: A piloted hand tool adaptor for connecting a conventional rotary hand tool or rotary cutting tool to the chuck of a rotary-operated machine such as a lathe or drill press in order to provide mechanical axial support and alignment of the tool to a work piece while allowing manual rotation and advancement of the tool towards the work piece. One end of the adaptor has means such as a socket to attach to the butt-end and T-bar handle of a rotary hand tool such as a common tap handle. The other end of the adaptor has a two element axial support system such as a pilot and bushing, grippable within the chuck of the rotary-operated machine, which provides axial or lateral support and alignment without affecting manual control of rotational and longitudinal motion. The adaptor may have a supplemental detachable handle bar oriented perpendicular to the T-bar handle of the hand tool.