Method for shaping a periodic structure, in particular a toothing, and lifting cam

A method for shaping a periodic structure on a workpiece, in which method a lifting mechanism (10, 20, 99) lifts a shaping tool (40), after a machining working stroke (Mxc1) of the shaping tool (40), off of the workpiece for a return stroke (Mxv1) of the shaping tool (40) after the machining working stroke, wherein the working stroke and the return stroke define a stroke cycle,

• wherein the lifting mechanism (10, 20, 99) comprises a lifting cam (10), wherein the lifting cam comprises a rotary cam having a circumferential cam profile extending all the way around a rotational axis of the lifting cam, wherein the circumferential cam profile comprises a partial circumferential angular cam profile region that extends less than all the way around the rotational axis of the lifting cam (10), wherein the partial circumferential angular cam profile region extends from an angular cam profile region beginning point to an angular cam profile region end point,
• the lifting cam being driven to rotate about the rotational axis by a motor of the lifting mechanism,
• the method comprising rotating the lifting cam from the angular cam profile region beginning point, which angular cam profile region beginning point is correlated with a beginning of the stroke cycle, to the angular cam profile region end point, which angular cam profile region end point is correlated with an end of the stroke cycle, wherein the partial circumferential angular cam profile region is passed through at least a first time and a second time during the same stroke cycle, with the direction of rotation of the lifting cam during the first time and the second time being opposite to one another, and wherein during the stroke cycle, the lifting cam is constantly rotating except for at time(s) when the lifting cam is at one or more movement reversal points at which the direction of rotation of the cam is reversed.