Abstract: The electro-contact discharge dressing with a couple of electrodes is a new kind of technology to dress metal bonded diamond grinding wheels .It works on the principle of electro-contact discharge erosion to remove the metal bond of grinding wheel, then to make the wheels dressing or truing. In this paper, the dressing principle is described in detail, and the technical law is analysed systematically. The different kinds of grinding wheels were dressed by this new technology, and now it has been appied in some factories .

Key words: a couple of electrodes, electro-contact discharge, dressing, diamond grinding wheel