A method for producing mechanical locking systems in a floor panel using a first tool configuration and a second tool configuration , the floor panel comprising: wear resistant top surface layer , a core and a mechanical locking system on a first and a second edge for horizontal locking of the floor panel with similar other panels, the mechanical locking system comprising: a first pair of locking surfaces in the first edge of a panel and a second pair of locking surfaces in the opposite second edge , the first pair of locking surfaces comprises a first upper edge and a locking element , the second pair of locking surfaces comprises a second upper edge and a locking groove , characterised in that the method comprises: displacing the floor panel in a feeding direction (FD) with its first edge relative the first tool configuration and with its second edge relative the second tool configuration , the first tool configuration comprises a first and second tool body (TB1, TB2) positioned on the same side of a second column having two opposite column sides , and the second tool configuration comprises a first and second tool body (TB1', TB2') positioned on the same side of a third column having two opposite column sides , wherein the first and the second tool configurations are positioned essentially opposite each other transversally to the feeding direction, pre-processing at least a part of the wear resistant top surface layer of the floor panel on the first upper edge such that properties of the surface layer are changed by removing a part of a ridge on the upper edge of the wear resistant top surface layer , forming by the first (TB1) and second (TB2) tool body of the first tool configuration at least a part of the first pair of locking surfaces , and forming by the first tool body (TB1') and second tool body (TB2') of the second tool configuration at least a part of at least one of the surfaces of the second pair of locking surfaces , wherein the intermediate preprocessing tool is positioned on a first column and the first tool configuration comprises a COMBI tool on an adjacent side of the second column such that four rotating tools are positioned on three columns and on three column sides. displacing the floor panel in a feeding direction (FD) with its first edge relative the first tool configuration and with its second edge relative the second tool configuration , the first tool configuration comprises a first and second tool body (TB1, TB2) positioned on the same side of a second column having two opposite column sides , and the second tool configuration comprises a first and second tool body (TB1', TB2') positioned on the same side of a third column having two opposite column sides , wherein the first and the second tool configurations are positioned essentially opposite each other transversally to the feeding direction, pre-processing at least a part of the wear resistant top surface layer of the floor panel on the first upper edge such that properties of the surface layer are changed by removing a part of a ridge on the upper edge of the wear resistant top surface layer , forming by the first (TB1) and second (TB2) tool body of the first tool configuration at least a part of the first pair of locking surfaces , and forming by the first tool body (TB1') and second tool body (TB2') of the second tool configuration at least a part of at least one of the surfaces of the second pair of locking surfaces , wherein the intermediate preprocessing tool is positioned on a first column and the first tool configuration comprises a COMBI tool on an adjacent side of the second column such that four rotating tools are positioned on three columns and on three column sides. <EOS>