| 摘要 |
PURPOSE:To make it possible to perform the repetitive thread cutting, by inputting a reference pulse signal into a presettable counter, making an overflow signal output, and changing the thread cut starting time, in the case of such cutting method of a machine tool as shown in the title. CONSTITUTION:A digital electronic computer 1 calculates the preset data for thread cutting cycle every time, from the pitch K of a repetitive thread cutting command and the depth of cut DELTAK along the longitudinal direction of a thread, and presets it in a counter 4 after synchronizing it with the reference pulse 101 of a pulse generator 5, through a preset register 3. This counter 4 adds a pulse 102 which is generated from the pulse generator 5 by N cycles per one revolution of a main shaft, to the preset value, and outputs an overflow signal 103 to be fed in a thread cut controlling circuit 6. This thread cut controlling circuit 6 performs the thread cutting, synchronously with the reference pulse 102. In this constitution, the repetitive thread cutting can be performed without changing the thread cut starting point. |
