Abstract: A floor sweep auger system for mounting in an existing grain bin of the type having a wood or concrete floor and a cylindrical wall. A stationary auger is mounted with an inner intake end secured to the floor at the center of the bin and an outer discharge end extending through the wall of the bin at a location above the floor. A moveable auger, which has a length substantially equal to the radius of the bin, is mounted for sweeping an arc of approximately 360.degree.. A center mounting coupling of the moveable auger, which has a fixed pivot axis and a moveable pivot axis, allows the moveable auger to start from a position parallel to and adjacent one side of the stationary auger and to swing through the arc to a terminal position parallel to and adjacent the opposite side of the stationary auger.