Development of a Hand Plane Using a Utility Knife Blade for Junior High School Students

Abstract

Japanese-style hand planes with cap irons are used widely in junior high schools. They require fine adjustment of blade protrusion as well as regular maintenance. However, it is difficult for unskilled users such as junior high school students to carry out these adjustments and maintenances. This creates obstacles for students who use the plane in technology education. In this study, we developed a hand plane with the utility knife blade as a disposable blade. This plane is a single blade plane without a cap iron and the blade protrusion does not require adjustments. This plane can be used for edge planning and end planning of softwood board up to 15mm in thickness. Through practice, junior high school students were able to use this plane within one hour of teaching. During the practice session, it is necessary for the teacher to instruct the students on the method of pressing the plane sole against the board.