A machine for converting sheet stock material into a three dimension void fill material, the machine comprising: an inlet chute; an outlet chute; an internal drive assembly comprising a motor and power transmission system for rotating a plurality of opposed crush wheels, the crush wheels pulling the sheet stock from the inlet chute and pushing the void fill material to the outlet chute all in a downstream direction, a frame securing a drive motor and a first power transmission set (94, 96) adapted to rotate a drive axle on which a first set of crush wheels are rotated; and a subframe securing a driven axle on which a second set of crush wheels are rotated, wherein a second power transmission set (100, 102) is adapted to rotate the driven axle in synchronous rotation with the drive axle about substantially parallel axes of rotation, and wherein the subframe is movably attached to the frame to permit displacement of the driven axle and second set of crush wheels at least partly in the downstream direction and an opposite upstream direction, wherein the first and second sets of crush wheels have protrusions that define an outer swept diameter; wherein when the driven axle and the second set of crush wheels are not displaced in the upstream direction, the outer swept diameters of the first and second set of crush wheels overlap; wherein when the driven axle and the second set of crush wheels are displaced in the upstream direction, the outer swept diameters of the first and second set of crush wheels do not overlap; and wherein when the driven axle and the second set of crush wheels are displaced in the upstream direction and the outer swept diameters of the first and second sets of crush wheels do not overlap, the second set of one or more gears (100, 102) continues to rotate the driven axle in synchronous rotation with the drive axle. an inlet chute; an outlet chute; an internal drive assembly comprising a motor and power transmission system for rotating a plurality of opposed crush wheels, the crush wheels pulling the sheet stock from the inlet chute and pushing the void fill material to the outlet chute all in a downstream direction, a frame securing a drive motor and a first power transmission set (94, 96) adapted to rotate a drive axle on which a first set of crush wheels are rotated; and a subframe securing a driven axle on which a second set of crush wheels are rotated, wherein a second power transmission set (100, 102) is adapted to rotate the driven axle in synchronous rotation with the drive axle about substantially parallel axes of rotation, and wherein the subframe is movably attached to the frame to permit displacement of the driven axle and second set of crush wheels at least partly in the downstream direction and an opposite upstream direction, a motor and power transmission system for rotating a plurality of opposed crush wheels, the crush wheels pulling the sheet stock from the inlet chute and pushing the void fill material to the outlet chute all in a downstream direction, a frame securing a drive motor and a first power transmission set (94, 96) adapted to rotate a drive axle on which a first set of crush wheels are rotated; and a subframe securing a driven axle on which a second set of crush wheels are rotated, wherein a second power transmission set (100, 102) is adapted to rotate the driven axle in synchronous rotation with the drive axle about substantially parallel axes of rotation, and wherein the subframe is movably attached to the frame to permit displacement of the driven axle and second set of crush wheels at least partly in the downstream direction and an opposite upstream direction, wherein the first and second sets of crush wheels have protrusions that define an outer swept diameter; wherein when the driven axle and the second set of crush wheels are not displaced in the upstream direction, the outer swept diameters of the first and second set of crush wheels overlap; wherein when the driven axle and the second set of crush wheels are displaced in the upstream direction, the outer swept diameters of the first and second set of crush wheels do not overlap; and wherein when the driven axle and the second set of crush wheels are displaced in the upstream direction and the outer swept diameters of the first and second sets of crush wheels do not overlap, the second set of one or more gears (100, 102) continues to rotate the driven axle in synchronous rotation with the drive axle.