Techniques for the Use of Long Slender End Mills in High-speed Milling

Abstract

This paper presents two techniques using end mills in high-speed milling, in the first, the top speed and power of the spindle are accepted as fixed, and the structural dynamics are manipulated by adjusting the tool length so as to take advantage of stability lobe effects. Sometimes, lengthening the tool improves the metal removal rate. The second technique permits the machining of parts with very thin ribs. Tools with relieved shanks are used to avoid increases in axial depth of cut associated with forced vibration of the rib. Photographs of parts made with and without such tooling are shown.