Abstract: Feed screws are used for container filling machines in order to separate a series of approaching containers at a specific distance from each other. Feed screws for non-rotationally symmetrically shaped containers are milled with a milling tool rotating at a high rpm, the shaft of which is arranged parallel to the longitudinal axis of the feed screw that rotates at a lower rpm. To avoid feed screw flank errors, the rotating milling tool is moved up and down in an oscillating manner, so that a milling tool can be used, the contours of which agree exactly with the associated cross sectional area of the containers which are to be handled. The first shaft of the milling tool is attached to a sliding carriage, which is movably guided in an upward and downward direction by means of a crank mechanism.

Abstract: In an apparatus for machining polygon profiles, comprising a workpiece spindle and a tool spindle (12) driven in synchronism therewith and carrying an eccentric tool (22), wherein the transmission ratio between the workpiece spindle and the tool spindle as well as the lateral distance therebetween are adjustable, the invention provides for additional adjustment of the eccentricity of the tool. This permits one and the same tool to be employed for pre-cutting various polygon profiles of any standard nominal size in a rational manner and with close approach to the final profile shape. The cutting speed is increased by providing a disk-shaped counterweight (21) with adjustable eccentricity located on the tool spindle adjacent the tool. A common adjustment means (18, 24 to 27) is effective to automatically adjust the eccentricity of the counterweight in correspondence to the respective eccentricity of the tool.