A method of replacing at least one tooth of a gear includes providing a tool jig including a mounting block with a plurality of indexing jig features. The tool jig also includes a tool-supporting feature in laterally movable contact with a jig rail feature. With at least one indexing jig feature, relative motion of the tool jig relative to the gear is resisted. A material-removal tool is operated, while attached to the tool-supporting feature in the tooth-removal position, to remove at least a portion of a working circumference of the gear including a native gear tooth to be replaced. Motion of the material-removal tool is guided to generate a circumferential gear cut including a relatively smooth first cut surface formed by removal of at least the native gear tooth to be replaced. The material-removal tool is removed from the tool-supporting feature. The tool jig is removed from the gear.

A method for monitoring the condition of a hard finishing machine, in particular a grinding machine, wherein the hard finishing machine has a number of NC-controlled axes which are actuated during the machining of a workpiece, wherein, for the purpose of evaluating the condition of the hard finishing machine, at least one reference run is performed on at least one axis, during which the response of the axis to a drive signal is measured and evaluated. In order to enable improved condition monitoring of the hard finishing machine, the reference run includes a phase in which the axis is accelerated and/or braked.

A method for monitoring the condition of a hard finishing machine, in particular a grinding machine, wherein the hard finishing machine has a number of NC-controlled axes which are actuated during the machining of a workpiece, wherein, for the purpose of evaluating the condition of the hard finishing machine, at least one reference run is performed on at least one axis, during which the response of the axis to a drive signal is measured and evaluated. In order to enable improved condition monitoring of the hard finishing machine, the reference run includes a phase in which the axis is accelerated and/or braked.