Abstract: A machine for forming a formation in a sheet of material. The machine has a pair of upper and lower rollers which are driven rotatably by a motor. A single, stationary cutting bar is provided in an off-set position with respect to a center line of a rectangular opening in the frame of the machine. A blade assembly is laterally mounted to the frame across the rectangular opening. As the blade assembly is moved laterally closer to the cutting bar, the blade assembly produces a deeper cut into a sheet of material passing between the upper and lower rollers than if the blade assembly had not been moved laterally or had been moved laterally away from the cutting bar which would have produced a more shallow cut or a cut with less depth.