Abstract: A setting device for the conformal positioning of, for instance, a working member on a robot, has a driving motor and a reduction gearing. The latter consists of at least one spindle drive which moves a steel band or the like which is disposed around the take-off shaft and which is pretensioned against the torque applied by the tensioning means. The pretensioning can be applied by a spindle drive opposingly running in the same direction. Furthermore or alternatively it is possible to apply the pretensioning by spring force which acts on the steel band or steel bands.