FIELD: mechanical engineering; grinding tools. SUBSTANCE: invention is aimed at provided optimum structure and rational operation of grinding tools. Coefficient is determined after grinding of workpiece and attaining of wear of grinding wheel which requires dressing of wheel. Coefficient is determined as ratio of summary number of dents left from removed abrasive grains whose shape does not differ from shape of abrasive grains which made said dents in wheel to summary number of dents left in bond by all removed abrasive grins on the same section of the same area of grinding wheel working surface. EFFECT: provision of trustworthy coefficient of utilization, reduced labour input in calculating.
