Abstract: Processing accuracy varying with thermal displacement of a machine body is automatically, rapidly adjusted. There is provided a temperature detector for detecting temperature in the vicinity of a bearing for an inner-tooth milling cutter. Based on the temperature detected by the temperature detector, temperature-related correction data to be used for correction of basic processing data is computed. In this case, the correction data related to the diameter of the circular path followed by the center of the inner-tooth milling cutter is obtained by calculating a magnification with respect to the basic processing data, while the correction data related to the center of the circular path is obtained by calculating a deviation from the basic processing data.

Abstract: There is provided a broaching machine in which a first fitting portion to be fitted to a first end of the broaching shaft and a clamp for pressing the first fitting portion against the first end of the broaching shaft are provided at an end portion of the drive shaft, and a second fitting portion is formed at a front end portion of the support shaft so as to be fitted to the second end of the broaching shaft and is supported so as to be movable in an axial direction. A receptacle forming the second end of the broaching shaft is rotatable with respect to a main body of the broaching shaft. There is also provided a broaching machine in which a clamp bolt is threaded to the broaching tool body, an elongate hole is formed in a holder to which cutting segments of the broaching tool are mounted, and a press piece fitted to the clamp bolt is rotatable to engage the holder. Under this state, the holder is fixed to the broaching tool body by tightening the clamp bolt.