METHOD FOR SETTING POSITION OF STARTING POINT OF FEED SCREW MECHANISM

摘要

PURPOSE: To dispense with the installation of parts where special maintenances are required, easily set the starting point by the automatic operation, and set the position of the starting point of a feed screw mechanism in NC equipment with high precision without being affected by the change of the temperature, the shock, the adhesion of dust, etc. ;CONSTITUTION: In a feed screw mechanism of a numerically controlled machine tool, a servo motor 4 is controlled by a numerical control device, the rotational force from the servo motor 4 is transmitted to a feed screw 1 supported on a bearing 3 to rotate the feed screw 1, and this rotational motion is converted into the linear motion of a nut member 6 screwed to the feed screw 1. After the nut member 6 is advanced until it is brought into contact with the bearing, and the load on the servo motor 4 exceeds the prescribed value by the contact of the nut member 6 with the bearing 3, the feed screw 1 is reversely rotated to retract the nut member 6, and the prescribed rotational position of the feed screw 1 is detected by an encoder 5, and the position of the nut member 6 at the time point of the detection is stored in the numerical control device as the position of the starting point of the feed screw mechanism.;COPYRIGHT: (C)1995,JPO