The jointer plane, also known as the try plane or trying plane, is a type of hand plane used in woodworking to straighten the edges of boards in the process known as jointing, and to flatten the faces of larger boards. Its long length is designed to 'ride over' the undulations of an uneven surface, skimming off the peaks, gradually creating a flatter surface. In thicknessing or preparing rough stock, the jointer plane is usually preceded by the fore plane or jack plane and followed by the smoothing plane.
