Abstract: The invention is directed to an improved boring and facing apparatus for performing in-situ machining on nuclear reaction feedwater inlet nozzles. The apparatus comprises a boring machine mounted upon a main frame which main frame is suspended from a structure mounted above the plane in which the inlet nozzle is located. Means are provided for adjusting the boring machine to permit a tool to operate along the center line axis of the inlet nozzle.

Abstract: An apparatus and method for precision overboring a variable diameter existing bore through a metal shaft supported in a position that causes the shaft to sag along its longitudinal axis. A plurality of precision-formed tool pilots are selectively mounted ahead of a spade bit on a rotary boring tool to maintain the path of the bit through the shaft-workpiece within a predetermined tolerance of the path followed by an existing bore. A plurality of fluted follower bearings are positioned around the tool driving shaft to minimize its vibration as the bit proceeds through the workpiece. Liquid coolant is passed at high volume into engagement with the bit and thence through the follower bearing exhaust passageways to flush metal shavings and chips from the overbore. According to the method of the invention, tool vibration is carefully monitored as the bit is forced into the workpiece.