Abstract: A boring tool or like rotating tool, especially for a NC machine, is provided with a laterally projecting plunger which can be brought into contact with an abutment of the machine by the tool position mechanism therein to operate a stepping mechanism within the tool and correct the position of the cutting edge therein.

Abstract: A method of correcting tool lengths and tool radii, particularly for numerically controlled machines equipped with position or path measuring systems by means of a nominal-actual value comparison up to a length and radii with the actual values which comprises, comparing the length and radius of the tool with an actual value by means of the position or path measuring system with which the machine is equipped and which are associated with the axes of motion, storing the difference of the values with the correct sign in a correction memory of the numerical control as a tool length or radius correction, and wherein, the nominal actual value comparison is effected in the zero position or at the zero passage of an analog of a digital transmitter which is disposed so that its zero or zero passage position in the Z-axis and the X-axis corresponds to constant spacing from the machine (a+b).

Abstract: A machine tool comprises a main support with a machine stand on the main support carrying a headstock alongside a workbench which is mounted advantageously for movement toward and away from the headstock. The construction includes a tool magazine support mounted on the main support and the tool magazine and the headstock are mounted for relative movement in two distinct planes. In addition, the tool magazine carries a rotatable tool magazine disk having a plurality of recesses in its periphery each of which accommodates a tool carrier. The tool magazine disk is supported by the rotation in a third plane distinct from the first and second planes, and cam means are provided between the tool carrier and the tool magazine disk which are effective to lock the carrier to the disk and/or to the headstock in accordance with whether the tool carrier with the tool is to be inserted on the headstock or to be stored in the tool carrier disk.