Abstract
The paper presents a stability analysis for regenerative chatter of an orthogonal vibration system with two degrees of freedom which is placed around the cutting edge in orthogonal cutting with tools of restricted tool-chip contact length. In order to realize this system, a specially designed single point tool, of which rectangular shank can be rotated for both the tool post and the cutting edge of zero approach angle, was used in two dimensional turning of a pipe end. A numerical analysis of the chatter growth with the method proposed in the previous paper was carried out for obtaining the stability thresholds. The stability charts thus obtained were compared and proved to be in good agreement with those obtained with the experiments. It is found that the reduction of tool-chip contact length always improves the stability threshold regardless of the mode directions of the chatter vibration, and the smaller the contact length, the greater the impovement is realized.
