| 摘要 |
PURPOSE:To correctly work a workpiece without measuring the workpiece by correctly and easily detecting the position of the edge of a cuttig tool by using a position detector and calculating the feeding amount of the tool from this position. CONSTITUTION:A position detector 12 is installed onto the tail stock or the chuck of a lathe. Then a shank 15 is electrically connected to the lathe body and a cutting tool installed onto the lathe, and also the center shaft coincides with the center shaft of a work. Therefore, when the edge of the cutting tool is attached onto the cylindrical surface 31 of a contact-point member, an electrical circuit consisting of a battery 22 and an LED which are connected in series is closed, and the LED24 comes ON, and the contact between the cutting tool and a contact-point member 18 is detected, and the position of the top edge of the cutting tool can be correctly detected. In other word, the radius R of the cylindrical surface 31 of the contact-point member 18 can be worked with high accuracy, and the contact between the cylindrical surface 31 and the edge of the cutting tool is electrically detected, and the position of the cutting edge is set at the position far by R from the revolution center shaft. Therefore, it is enough to calculate the feeding amount of the tool from this position. |
