METHOD AND INSTRUMENT FOR MEASURING POSITION OF HOLE

摘要

PROBLEM TO BE SOLVED: To provide a method and instrument by which the position of a hole can be measured with accuracy even when the hole is formed at the complicated location of a work. SOLUTION: An optical range finder 22 and a mirror 23 which flexes the optical axis 22g of the range finder 22 toward a work are attached to a measuring head 21 mounted on the operating end of a robot. The position of a point at which a measured distance abruptly changes is measured as the position of a point at the margin of a hole Bb crossing a scanning line which is set so that the irradiated point of a work may cross the hole Bb by moving the head 21 along the scanning line. When holes Bb and Bb are respectively formed through a pair of plate section Pa and Pa faced oppositely to each other, a pair of range finders 22 and a pair of mirrors 23 are attached to the head 21 so that the positions of both holes Bb and Bb may be measured simultaneously.