Abstract: A machine (10) for cutting a rebate edge (30) in a building panel (24) has a cutting wheel (12) which can be connected to a source of power for rotating the cutting wheel. There is a planar plate (14) that has a flat surface (16) located parallel to the cutting wheel (12). The flat surface (16) can allow a planar portion of the panel (24) to be slid thereover so that an edge of the panel can engage the cutting wheel (12). The flat surface (16) is spaced apart from the cutting wheel (12) by a distance so that, in use, the cutting wheel causes the removal of a portion of the edge so as to form a rebate edge (30) of the panel. Ideally, building panel (24) is a plasterboard panel which has an edge formed by a core encased between two surface layers.