| 摘要 |
PURPOSE:To perform positioning accurately by measuring a time lag distance produced before a contact signal due to a contact between a workpiece and a measurement probe is recognized by the use of two kinds of relative speeds of each control shaft multiple times in advance and by making the difference between the mean values of the measurements a compensation value. CONSTITUTION:An NC device 2 automatically measures a recognition point including a time lag distance traveled from a moment at which a measurement probe TS contacts a workpiece W to a moment at which a contact signal TDS due to the contact is recognized multiple times for each control shaft by the use of two kinds of relative speeds by means of an arithmetic processing device 40, and a mean value of the measurements is obtained. A difference between recognition points due to two kinds of relative speeds is further obtained and stored as a compensation value for each control shaft into a memory 41. When measuring the position of a reference surface TQ of the workpiece W by means of the measurement probe TS, the workpiece W is positioned to the position determined by subtracting the compensation value from a value of a current position counter G. This makes it possible to position the workpiece accurately without input errors of the compensation value. |
