The paper proposes a new education software system for flat finishing skill with an iron file based on classification of personal peculiarities. The software measures leaner's flat finishing motion by using a 3D stylus, and displays classified personal peculiarities effectively to correct learner's finishing motions. A torus type Self-Organizing Maps is used to classify such unknown number of classes of peculiarity patterns.

Early developing results of the peculiarity computation classification parts with measured data of an expert and sixteen learners show effectiveness of the proposed system.