Abstract: Apparatus for forming and measuring a bore includes a rotating shaft with one or more metal cutting tools disposed on a cutting head and a non-contact, pneumatic gaging device mounted on the shaft for rotation therewith. The measuring device is advanced into the bore formed by the tools so that it measures the inner diameter of the bore as the rotating shaft is advanced into the bore during the cutting stroke. Accordingly, a single stroke of the boring apparatus serves both to form a desired internal diameter and to measure the diameter formed during the cutting stroke. In a preferred embodiment of the invention, the tools are held by a positioning device which allow the tools to be moved radially with respect to the shaft so that the diameter of the bore formed by the tools may be varied. If the measured diameter deviates from the desired diameter, the positioning means repositions the tools as necessary to achieve the desired bore diameter on a subsequent cutting stroke.