Method of correcting grill height spacing of a cathode-ray tube

摘要

A correcting method to correct a distance between an inner surface of a panel and a color selection mechanism of a cathode-ray tube is disclosed in which a female type machining electrode (21) having a concave portion (21a) same in shape as a panel pin (15) supporting the color selection mechanism is used, a center axis (22) of panel pin (15) and a center axis (23) of female type machining electrode (21) are made eccentric, and one surface of panel pin 15 is shaved by electric spark machining between the female type machining electrode (21) and the panel pin (15) in accordance with an correcting amount of the distance to thereby correct the distance with high precision.