A used pneumatic tire casing is fixedly supported from within and about a rotatable shaft. A cutter drive bar is attached to and rotates with the shaft. Cutters are attached to the cutter drive bar. With the tire casing so supported and the cutters moved to pierce the tire casing, the shaft is rotated. The cutter drive bar and cutters rotate with the shaft, sweep through 360* and cut the tire casing into a number of circular portions.