| 摘要 |
PURPOSE:To promote the high accuracy of machining operation, by performing resetting the original point detecting the pitch error original point by rotating a C-axis driving motor and performing from that condition the pitch error correction of a main spindle based on a pitch error data. CONSTITUTION:When a machine tool performs machining accompanying a rotary control of a C-axis, the machine tool, first orienting a main spindle 2 and connecting in that condition a disconnection shaft 6 to an intermediate shaft 5 next driving a C-axis driving motor 7 to be rotated, detects the pitch error original point PZ serving as the reference of a pitch error data PED, performing resetting the original point by an orient-original point reset control part 13. From that condition, the machine tool, being based on the pitch error data PED in a memory 12, performs the correction action of a pitch error in the main spindle 2 by a pitch error correction control part 10. In this way, the machine tool, which permits the correction of the pitch error in accordance with the control of the C-axis to be accurately performed in a manner corresponding to the pitch error data PED, enables high accurate machining operation to be performed.
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