Abstract: An electrochemical machining apparatus is disclosed for removing material from a tubular workpiece. An electrode having a conical tip is supplied with electrolyte around the outer periphery and through the center of the electrode. A predetermined gap is maintained between the electrode and the tubular workpiece. The combination of the conical tip and the electrolyte being supplied around the outer periphery, and at the center of the electrode, ensures that the gap between the electrode and the tubular workpiece will be maintained at a predetermined distance preventing short-circuiting or uneven drilling of the tubular workpiece. A sheath of insulation surround the electrode to prevent unwanted electrochemical machining.