PURPOSE: To increase elasticity in grinding by arranging the constitution in such a way that other part made up by mixing metal powder, graphite powder and ethylene-vinyl acetate copolymer or its saponified substance at the specified ratio become 100W200 by weight to the abrasive grain of 100 by weight in an electrolytic grinding stone for grinding brittle material.
CONSTITUTION: A part constituted of metal powder, graphite powder and ethylene-vinyl acetate copolymer (EVA) or its saponified substance other than abrasive grain is made 100W200 by weight to the cemented carbide abrasive grain, such as diamond and cubic boron nitride, etc., of 100 by weight so as to constitute electrolytic grinding stone. Then, as for the ratio between metal, graphite and EVA, etc. the metal is determined as 30W70% and the graphite as 20W50% and EVA or its saponified substance 10W30% by weight considering mutual relations, since the metal provides conductivity, the graphite lubricity and EVA or its saponified substance high bonding power and elasticity. In this way, the abrasive grain becomes strong in bonding power and stable in conductivity and especially large in elasticity during grinding, accordingly the spark will never happens.