Abstract: The present invention provides a tool for attachment to a milling machine. The tool comprises an elongated hollow housing defined by a neck section, a middle section, and a bottom section. The neck section is adapted to engage a spindle of the milling machine for rotational and axial movement therewith. A torque spring is situated within the middle section of the housing. A torque adjuster is dimensioned and configured to sit within the neck section of the housing on top the torque spring. The torque adjuster provides the capability of setting the torque spring to a predetermined torque threshold level. A bit holder is rotationally mounted to the bottom section of the housing. A driver mechanism is interposed between the bit holder and the torque spring. The driver mechanism is coupled to the bit holder for simultaneous rotation therewith. When the torque threshold is reached by the bit holder, the driver mechanism rotationally disengages from the bit holder.

Abstract: The present invention provides a tool for attachment to a milling machine. The tool comprises an elongated hollow housing defined by a neck section, a middle section, and a bottom section. The neck section is adapted to engage a spindle of the milling machine for rotational and axial movement therewith. A torque spring is situated within the middle section of the housing. A torque adjuster is dimensioned and configured to sit within the neck section of the housing on top the torque spring. The torque adjuster provides the capability of setting the torque spring to a predetermined torque threshold level. A bit holder is rotationally mounted to the bottom section of the housing. A driver mechanism is interposed between the bit holder and the torque spring. The driver mechanism is coupled to the bit holder for simultaneous rotation therewith. When the torque threshold is reached by the bit holder, the driver mechanism rotationally disengages from the bit holder.