ICRODRILLING OF Printed Circuit Boards (3rd Report) -Non-contact Measurement of Small Cutting Torque Using Deformation of Thin-walled Elastic Cylinder-

摘要

Drill breakage is one of the major problems in small hole drilling. Therefore, real time breakage prediction can improve production reliability remarkably. To predict drill breakage, this paper describes an in-process non-contact measurement of small cutting torque acting on micro drill. A thin-walled elastic cylinder is divided into three parts by two parallel slits. The top cylinder is connected to the middle with a small beam and the middle cylinder is also connected the bottom with a small beam at the opposite side of the top.