A holder or supporting apparatus is described for use
on an electrode discharge machine (EDM) for both
holding and rotating an electrode. The apparatus uti
lizes a turbine wheel driven from the pressurized di
electric ?uid available on an EDM, for rotating a
chuck or collet in which the electrode is carried.
Means are also provided to guide the electrode, using
an interchangeable guide bushing to
electrodes of various diameters.