This paper is discribing chiefly the characteristic and performance of electro discharge grinding. Grindstone is vitrified bond diamond wheel (No. 140/170 GE RGV). Workpiece have used alumina, alumina sintering additive silicon nitride (ASN) and partial stabilized zirconia (ZrO
2). Electrolyte contains 5 weight percentage caustic soda.
A full wave rectifiered commercial alternative current (DC 80V, 120V) is supplied from generator. It is concluded from this experiment.
1) It is certain that the light by generation in gap is an arc discharge light.
2) The wear of ceramics by the combination of electrochemical machining and discharge machining is very little compared to grinding.
3) One of the effect of discharge on this kind of grinding is a decreased electric driving power.
We can say that decrease of driving power has been caused by automatic dressing of grindstone.
4) At the small depth of cut of alumina, driving power is not decreased compare with non discharge grinding time.
5) In both cases either discharge grinding or not, the sharpness of edge becomes blunt. To keep the sharpness of grindstone, traditional dressing must be used.
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