In many vertical double strokes the keyway is drawn into the workpiece chip for chip with a single-edged keyseating cutter . This means that the workpiece, the centring and the column are located statically on the machine table. The cutterbar and feedbar together form the vertical cutting movement.

The chip thickness is delivered by the wedge of the feedbar, which is drawn downwards relative to the keyway cutter prior to each new downstroke. The width tolerance of the keyway is obtained from the appropriately smoothed cutter. The workpiece and the cutter are taken up exactly centrally to the column.

The positive locking of the connection between the workpiece and the tool guarantees that the keyway in the bore as well as the parallelism of the axis are precisely positioned. The exactly guided cutter ensures high surface quality.