Method for generating control command data for controlling a cnc-lathe

A method for generating control command data for controlling a CNC-lathe to perform a turning operation by means of a turning tool, the method comprising the steps of:

• selecting a representation of a metal blank;
• selecting a representation of a turning tool;
• selecting a volume of material from the metal blank to be removed by means of the turning tool, said volume being limited by an inner surface and an outer surface, said metal blank being limited by a peripheral surface, wherein the peripheral surface comprises the outer surface;
• selecting an end position;
• selecting a recommended cutting depth for the turning tool;
• selecting a recommended allowed cutting depth for the turning tool;
• and, based on the above selections, generating control command data for:
• (b) commanding the turning tool to go into cut at a point of the unmachined inner surface which is most remote from the end position;
• and for
• (c) commanding the turning tool to move along the inner surface towards the end position until either:
• the turning tool reaches the end position, or
• a cutting depth is equal to or greater than one of either the maximum allowed cutting depth or the recommended cutting depth, whereby the turning tool is commanded to move away from the inner surface, or
• the turning tool reaches a predefined position, whereby the turning tool is commanded to move away from the inner surface.