Abstract
This paper presents a rationalization of centering operation, which is of importance to reduce the setting error for machining and measuring workpieces. The centering operation is fairly troublesome, therefore, a device was designed to make the centering operation rapidly and correctly, having a talk with a cost-effective microcomputer. The device with a non-contacting displacement sensor is driven around the circumference of workpiece by two stepping motors. Sampled signals of the distance between the surface and the sensor by an AD converter are input to the microcomputer. The microcomputer replys the deviation of the center of workpiece from that of the device on CRT display, while the arm with the sensor comes to a full stop for an operator to easily find out the direction to strike the workpiece with a hammer. The deviation of the center decreases with increasing the number of repetition of measuring and hammering. As a result, the device can afford great relief to the centering operations. In addition, the device is also available to measure the roundness of workpiece on the spot.
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