Abstract
This paper presents the transition between plastic deformation, ductile and brittle cutting in a high speed micro glass cutting. Experiments with the small inclination of the workpiece to give a gradual increase of the depth of cut show that there are three characteristic phases during the cutting. These are characterized as follows; (i) only the thrust component of cutting force is measured, (ii) the principal and thrust components of cutting force are measured and (iii) the variance of cutting force becomes larger. Machined surface conditions observed by a laser micro scope and a surface profiler corresponding to the three phases are examined. Especially, the phase (i) seems to be deformation by densification of a glass. In the last of the paper, an application cutting using the phase (i) to make a deep groove is presented.
