Development of rafter processing machine for Korean traditional houses

The Korean traditional house is famous for its beauty and healthful aspects. However, its construction cost is too high because of the manual process of parts such as rafter, timber, etc. These days, many people want to build a modernized Korean traditional house at a low cost. In order to do so, the rafter machining process is required to be automatized using a CNC machine. It is also observed that, generally the timber does not have a uniform shape. Therefore, it is also needed to examine the timber shape before starting its processing. This paper presents the concept design of the rafter processing CNC machine, and a 3D laser scanning system. The laser scanner is developed for obtaining 3D details of the timber shape. Furthermore, the results of simulated experiments are presented to investigate surface roughness during the machining process of the timber. Because cutting parameters largely influence on surface roughness and cusps formation; therefore, to achieve optimal machining parameters, several experiments were carried out with small and larger cutting tool diameter, different of feed rate and spindle speed.