ELECTRICAL DISCHARGE MACHINE APPARATUS AND METHOD FOR REVERSE TAPER BORES

摘要

An electrical discharge machining apparatus having a wire electrode and a guide system for machining reverse-taper bores in a workpiece, particularly cone-shaped bores. A guide body near the workpiece stabilizes a first portion of an electrode and a second portion of the electrode extends from the guide body terminating in a working tip. As the guide body is wobbled about the longitudinal axis of a desired workpiece bore, the electrode is advanced and the working tip of the electrode erodes progressively larger closed curves in the workpiece, resulting in a reverse taper bore in the workpiece.