| 摘要 |
PROBLEM TO BE SOLVED: To prevent the vibration of a machine in the case of C shaft working, and to improve working precision, and to extend machinery lifetime, and to reduce machinery costs in a composite lathe structured to belt-drive a main shaft. SOLUTION: In a composite lathe structured to transmit the rotation of a main shaft motor through a belt to a main shaft, a belt tension is increased only in the case of C shaft working. That is, when the conversion of the working program of an NC device into a C axial mode is commanded, a tension addition signal (a) to operate a tension addition device 15 of a main shaft driving belt 11 wound between the main shaft and the main shaft motor is output, and when recovery from the C axial mode is commanded, a tension addition release signal b to release the operation of the tension addition device is output. Thus, it is possible to prevent the deterioration of working precision or the vibration of a tool generated in the case of C shaft working without deteriorating a bearing lifetime or a belt lifetime. COPYRIGHT: (C)2007,JPO&INPIT
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