Countersinking device and associated method

A method of forming a portable countersinking device, comprising:

• engaging a distal end of a driver rod with a collet of an internal bore positioner adapted to be received by a bore defined by a workpiece, the driver rod being configured to extend from the internal bore positioner toward a proximal end of the driver rod and outwardly of the bore through a bore opening in a surface of the workpiece, the collet including a base engaged with the distal portion of the driver rod and a plurality of gripping members extending longitudinally from the base away from the proximal portion of the driver rod, the gripping members being angularly spaced apart about a periphery of the base and being configured to be actuatable between a contracted arrangement and an expanded arrangement;
• coaxially engaging a mandrel with the distal end of the driver rod such that mandrel is configured to be actuatable and axially movable between a contracted position and an extended position with respect to the distal end, the mandrel actuated to move toward the proximal portion of the driver rod to the contracted position being received between the plurality of gripping members and urging the gripping members radially outward into the expanded arrangement in engagement with the bore so as to secure the collet at a selected depth therein, and the mandrel actuated to move away from the proximal portion of the driver rod to the extended position allowing the plurality of gripping members to return to the contracted arrangement allowing the collet to be inserted into and removed from the bore;
• engaging a centering chuck about the driver rod, the centering chuck being movable longitudinally along the driver rod and being configured to engage the bore opening so as to cooperate with the internal bore positioner to align the driver rod along a longitudinal axis of the bore;
• engaging a counterbore about the driver rod, opposite the centering chuck from the internal bore positioner, the counterbore being rotatable about the driver rod and configured to be axially advanced along the driver rod to engage the bore opening and to countersink the bore;
• and
• associating a countersink depth control arrangement with the counterbore, the countersink depth control element being configured to cooperate with the counterbore to countersink the bore to a predetermined depth.