| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that, it is difficult to determine a factor of variation of screw pitch.SOLUTION: A system 30 for calculating screw pitch comprises: a first detection part 32 for detecting a rotation angle of a rotation shaft 20; a second detection part 34 for detecting a movement amount of a feed shaft 22; and a calculation part 36 for, based on the rotation angle detected by the first detection part 32, and the movement amount detected by the second detection part 34, calculating the movement amount for one rotation of the rotation shaft 20 when a screw is formed on a workpiece W.SELECTED DRAWING: Figure 1 |
