;Contents: Thermo-stimulated electron emission from sand-blasted metals; Cutting of photo-elastic materials at speed over elastic distorsion wave propagation velocity; Chip formation at cutting speed requiring considerations of particle velocity and plastic wave propagation; Dynamical analysis of vibration cutting; Basic motions for pick-and-place mechanism; Micro-welded HSS tools with carbide or oxide; Calculation of the pressure produced; Effects of rust preventives in cutting fluids on tool wear; Equivalent grade characteristics of the vibrating grinding wheel; Abstracts of the original papers published in Apr-June, 1971 on Journal of the Japan Society of Precision Engineering.