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・ Ensure that the button die face that contacts the panel is flat. There is a chance of not being able to perform appropriate hole-opening if a flat surface is not secured. ・ Make the punch intrusion is 3.0〜4.0mm. There is a chance that appropriate hole-punching cannot be performed if intrusion is 3.0〜4.0mm. ・ Ensure that the Punch center axis angle against the button die face is 2.5 degrees or under. Flat surface secured Intrusion Lack of flat surface 3.0〜4.0mm 2.5 degrees or under 2.6 degrees or more Breaking Punch Punch Unit 396