Abstract: In a boring machine having an elongated rotating boring bar for internal end boring of elongated workpieces, the boring bar is rigidized during initial internal boring operations by clamping the workpiece in axial alignment with the axially rotating elongated boring bar and the boring bar is radially clamped intermediate its ends with a clamp which rotates with the rotating bar to rigidize the bar during initial boring operations. After initial end boring of the workpiece, the clamp is radially retracted and the boring operation is continued on the workpiece to a depth beyond the position of previous clamping on the boring bar.

Abstract: The inside diameter and outside diameter of an upset pipe end are simultaneously bored and turned respectively by a combination tool. Boring and cutting elements on the tool are simultaneously disengaged from the pipe end in a controlled manner to taper out the cuts and permit rapid retraction of the tool without contacting the finished surfaces and possibly producing a scratch mark.