The Development and Effect of Auxiliary Tools for Carpenter's Squares

Abstract

The purpose of this study is to develop auxiliary tools for carpenter's squares that create no gap between a short branch and the surface of the wood even when junior high school students and beginners mark a line perpendicular to the side as the base plane when using the carpenter's squares. It also aims to test the effectiveness of the developed auxiliary tools. We developed three types of auxiliary tools made of stainless steel: A and B, which are attached to the outer side of the short branch, and C, which is attached to the inner side of the long branch. After examining the effects on university and junior high school students, the following results were obtained. When auxiliary tools A and B were attached, the marking was made in a more accurate position at the start near the side plane. With successive auxiliary tool attachment, the number of times the short branch was lifted during marking decreased. Examination of the marking lines suggested that lifting the short branch was related to the occurrence of a curve in the marking line. As carpenter's squares are frequently used, both university and junior high school students rated the auxiliary tool B highly, with junior high school students also rating the auxiliary tool C highly.