부산대학교 도서관

To machine complicatedly-shaped holes is required for building pipe lines of pneumatic components or hydraulic equipments. However, the degree of freedom of machinable hole shapes is limited, since holes are usually fabricated by drilling. In order to improve the degree of freedom of the shapes, the authors devised the method to fabricate a hole on the inside wall of a hole by means of electrical discharge machining. The method employs a very simple device. The results obtained from the fundamental experiments show that the method has the possibility to machine such a hole.