METHOD FOR MANUFACTURING MASTER OF DIE FOR SHAPING GOLF BALL

摘要

A method for forming a plurality of small concaves, for forming dimples (3) on the surface of the golf ball (2), on a semispheric surface of a material of a master by electric discharge machining in such a manner that the small concaves are nonspheric in a direction perpendicular to the semispheric surface and in a vertical section of each small concave.